67486 + Interview Questions in Secondary School in Physics

1.	What is the electric field due to : 1) Point charge 2) Line charge 3) Sheet of charge 4) Spherical conducting shell
Answer»

Discussion

2.	Parallelogram law of analytics sa result and calculation nekalna?
Answer» ANSWER: According to the Parallelogram law of vector addition, if two vectors a and b represent two SIDES of a parallelogram in magnitude and direction, then their sum a + b = the DIAGONAL of the parallelogram through their common POINT in magnitude and direction.

2.

Parallelogram law of analytics sa result and calculation nekalna?

Answer»

ANSWER:

According to the Parallelogram law of vector addition, if two vectors a and b represent two SIDES of a parallelogram in magnitude and direction, then their sum a + b = the DIAGONAL of the parallelogram through their common POINT in magnitude and direction.

Discussion

3.	Answer from photo no. 10
Answer» $\sf{\large{\underline{\underline{EXPLANATION:}}}}$ $\textbf{\underline{Given,,}}$ Height of object,h=2.5mm=+0.25cm Height of image,h'=10mm=-1cm Distance of the object from the MIRROR,u=-5cm Distance of image from the mirror,v=?? FOCAL length,f=?? $\textbf{\underline{Using,,}}$ $\sf{\boxed{\frac{h'}{h}=\frac{-v}{u}}}$ $\textbf{\underline{We get,,}}$ $\sf{\to{\large{\frac{1}{0.25}=\frac{-v}{-5}}}}$ $\sf{\to{\large{4=\frac{v}{5}}}}$ $\sf{\to{\large{v=20cm}}}$ $\textbf{\underline{Using,,}}$ $\sf{\boxed{\frac{1}{v}+\frac{1}{u}=\frac{1}{f}}}$ $\textbf{\underline{Substituting value of 'v' and 'u' in formula, we get,,}}$ $\sf{\to{\large{\frac{1}{20}+\frac{1}{-5}=\frac{1}{f}}}}$ $\sf{\to{\large{\frac{1}{20}-\frac{1}{5}=\frac{1}{f}}}}$ $\sf{\to{\large{\frac{1-4}{20}=\frac{1}{f}}}}$ $\sf{\to{\large{\frac{-3}{20}=\frac{1}{f}}}}$ $\sf{\to{\large{\frac{-20}{3}=f}}}$ $\sf{\to{\underline{\boxed{f=-6.67 cm}}}}$ HENCE,,Focal length,f=-6.67 cm $\rule{200}2$ HOPE it helps ❣️❣️

3.

Answer from photo no. 10

Answer»

$\sf{\large{\underline{\underline{EXPLANATION:}}}}$

$\textbf{\underline{Given,,}}$

Height of object,h=2.5mm=+0.25cm

Height of image,h'=10mm=-1cm

Distance of the object from the MIRROR,u=-5cm

Distance of image from the mirror,v=??

FOCAL length,f=??

$\textbf{\underline{Using,,}}$

$\sf{\boxed{\frac{h'}{h}=\frac{-v}{u}}}$

$\textbf{\underline{We get,,}}$

$\sf{\to{\large{\frac{1}{0.25}=\frac{-v}{-5}}}}$

$\sf{\to{\large{4=\frac{v}{5}}}}$

$\sf{\to{\large{v=20cm}}}$

$\textbf{\underline{Using,,}}$

$\sf{\boxed{\frac{1}{v}+\frac{1}{u}=\frac{1}{f}}}$

$\textbf{\underline{Substituting value of 'v' and 'u' in formula, we get,,}}$

$\sf{\to{\large{\frac{1}{20}+\frac{1}{-5}=\frac{1}{f}}}}$

$\sf{\to{\large{\frac{1}{20}-\frac{1}{5}=\frac{1}{f}}}}$

$\sf{\to{\large{\frac{1-4}{20}=\frac{1}{f}}}}$

$\sf{\to{\large{\frac{-3}{20}=\frac{1}{f}}}}$

$\sf{\to{\large{\frac{-20}{3}=f}}}$

$\sf{\to{\underline{\boxed{f=-6.67 cm}}}}$

HENCE,,Focal length,f=-6.67 cm

$\rule{200}2$

HOPE it helps ❣️❣️

Discussion

4.	Calculate solar day in second
Answer» 86,400 seconds One MINUTE has 60 seconds, One hour has 60 MINUTES and one day has 24 hours. Thus, 80 X 60 x 24 = 86,400 seconds in a day Although the answer is 86,400 It is an approximate answer, As the rotation of EARTH is not consistent

4.

Calculate solar day in second

Answer»

86,400 seconds

One MINUTE has 60 seconds, One hour has 60 MINUTES and one day has 24 hours. Thus, 80 X 60 x 24 = 86,400 seconds in a day

Although the answer is 86,400 It is an approximate answer, As the rotation of EARTH is not consistent

Discussion

5.	The resistant or tha fuse wire is(1)low (2)moderate (3) zero (4)very high
Answer» ANSWER: (4) EXPLANATION:

5.

The resistant or tha fuse wire is(1)low (2)moderate (3) zero (4)very high

Answer»

ANSWER:

(4)

EXPLANATION:

Discussion

6.	Is plasma related with the glowing of ?
Answer» Answer: The glow DISCHARGE regime owes its name to the fact that the plasma is luminous. The GAS glows because the electron energy and number density are high enough to generate visible LIGHT by EXCITATION collisions.

6.

Is plasma related with the glowing of ?

Answer»

Answer:

The glow DISCHARGE regime owes its name to the fact that the plasma is luminous. The GAS glows because the electron energy and number density are high enough to generate visible LIGHT by EXCITATION collisions.

Discussion

7.	Acceleration is a vector quantity, which indicates that its value 1 point (a) Is always negative (b) Is always positive (c) Is zero (d) Can be positive, negative or zero
Answer» Answer: VECTOR may be negative or may be POSITIVE or may be ZERO...

7.

Acceleration is a vector quantity, which indicates that its value 1 point (a) Is always negative (b) Is always positive (c) Is zero (d) Can be positive, negative or zero

Answer»

Answer:

VECTOR may be negative or may be POSITIVE or may be ZERO...

Discussion

8.	What is the nature of force between the two charges if q1 >0 and q2 >0 or q1
Answer» Answer: in both the cases you got force of REPULSION . Explanation: b'coz charges of same polarity either positive or negative 'll always repel each other .... untill and unless if the magnitude of one charge is too larger than other... for eg. i have q1 = 1000C and q2=5mC ... then here i'got force of attraction due to induction......

8.

What is the nature of force between the two charges if q1 >0 and q2 >0 or q1

Answer»

Answer:

in both the cases you got force of REPULSION .

Explanation:

b'coz charges of same polarity either positive or negative 'll always repel each other .... untill and unless if the magnitude of one charge is too larger than other...

for eg. i have q1 = 1000C and q2=5mC ... then here i'got force of attraction due to induction......

Discussion

9.	Define Basic units of the SI system.
Answer» ANSWER: Explanation: The INTERNATIONAL System of UNITS is the modern form of the metric system. It is the only system of measurement with an official status in nearly EVERY country in the world

9.

Define Basic units of the SI system.

Answer»

ANSWER:

Explanation:

The INTERNATIONAL System of UNITS is the modern form of the metric system. It is the only system of measurement with an official status in nearly EVERY country in the world

Discussion

10.	AA person completes a round of circular trackof radius R in 40 second s. At the end of 2 minutes,displacement will be
Answer» Answer: Explanation: Think of a circlular track of radius R.... Now divide this into four equal parts . As the person COMPLETES one ROUND in 40 sec so he covers the boundry line of the each QUADRANT(Part) in 10 sec. Suppose he starts at the top of the track when t=0 . Now he completes 1st loop at t=40 , second at t=40+40 = 1min 20 sec and the next one at 2 MIN. So at 2 minute the person has completed 2 LOOPS of the circle and is at his initial position now in the next 20 second it is obvious that he is at the exact opposite side of the circle. The displacement will be equal to diameter. Given that radius is R so diameter i.e Displacement becomes 2R .

10.

AA person completes a round of circular trackof radius R in 40 second s. At the end of 2 minutes,displacement will be

Answer»

Answer:

Explanation:

Think of a circlular track of radius R....

Now divide this into four equal parts . As the person COMPLETES one ROUND in 40 sec so he covers the boundry line of the each QUADRANT(Part) in 10 sec.

Suppose he starts at the top of the track when t=0 . Now he completes 1st loop at t=40 , second at t=40+40 = 1min 20 sec and the next one at 2 MIN. So at 2 minute the person has completed 2 LOOPS of the circle and is at his initial position now in the next 20 second it is obvious that he is at the exact opposite side of the circle. The displacement will be equal to diameter. Given that radius is R so diameter i.e Displacement becomes 2R .

Discussion

11.	An elephant having mass of 300kg is standing on a concrete bridge of length 8m and breadth 4m. Calculate the pressure exerted by the elephant on the bridge. Given, acceleration due to gravity is 9.8m/s
Answer» ANSWER: given: m = 300 kg, G = 9.8 m/sec², L = 8m, B = 4m to FIND pressure exerted by the elephant pressure = force/area force = m × a or m × g f = 300 × 9.8 = 2940N area = 8 × 4 = 32 m² therefore P = 2940/32 => P = 91.875 N/m²

11.

An elephant having mass of 300kg is standing on a concrete bridge of length 8m and breadth 4m. Calculate the pressure exerted by the elephant on the bridge. Given, acceleration due to gravity is 9.8m/s

Answer»

ANSWER:

given: m = 300 kg, G = 9.8 m/sec², L = 8m, B = 4m

to FIND pressure exerted by the elephant

pressure = force/area

force = m × a or m × g

f = 300 × 9.8 = 2940N

area = 8 × 4 = 32 m²

therefore P = 2940/32

=> P = 91.875 N/m²

Discussion

12.	Hey guys letzz begin with the quiz !!the first question is ......name the first element of the periodic element do follow me to get notified with the next questions and to view the results
Answer» HYDROGEN.................

Discussion

13.	Wht is meant by torque
Answer» Answer: safety couplings - TORQUE limiters by JAKOB Antriebstechnik. Supplier of tourqe limiters for direct and indirect DRIVES. best quality. SPECIAL SOLUTIONS. competent consulting. Types: metal BELLOWS couplings, Elastomer couplings, Miniature couplings.

13.

Wht is meant by torque

Answer»

Answer:

safety couplings - TORQUE limiters by JAKOB Antriebstechnik. Supplier of tourqe limiters for direct and indirect DRIVES. best quality. SPECIAL SOLUTIONS. competent consulting. Types: metal BELLOWS couplings, Elastomer couplings, Miniature couplings.

Discussion

14.	The formation of for during winter is the example of dash
Answer» ANSWER: FOG Explanation: it should be fog BROO

14.

The formation of for during winter is the example of dash

Answer»

ANSWER:

FOG

Explanation:

it should be fog BROO

Discussion

15.	How can you minimise the rolling friction..
Answer» EXPLANATION: By applying GREESE or smooth surface we can MINIMISE the ROLLING friction.

15.

How can you minimise the rolling friction..

Answer»

EXPLANATION:

By applying GREESE or smooth surface we can MINIMISE the ROLLING friction.

Discussion

16.	Two cars a and b race each other. the car a ran for
Answer» ANSWER: idk Explanation: CHECK if QUESTION is CORRECT it is not FULL

16.

Two cars a and b race each other. the car a ran for

Answer»

ANSWER:

idk

Explanation:

CHECK if QUESTION is CORRECT it is not FULL

Discussion

17.	A positively charged insulator is brought near (but doesnot touch) two metallic sphere that are in contact. Themetallic spheres are then separated. The sphere whichwas initially farthest from the insulator will have:(a) no net charge(b) a negative charge(c) a positive charge(d) either a negative or a positive charge.
Answer» Answer: c) Explanation: the positively charged insulator PULLS the free the electron in sphere towards left till electrostatic EQUILIBRIUM is reached. Hence if both sphere are now SEPARATED the sphere 2. has deficiency of electron, i .e ., it has positive charge.

17.

A positively charged insulator is brought near (but doesnot touch) two metallic sphere that are in contact. Themetallic spheres are then separated. The sphere whichwas initially farthest from the insulator will have:(a) no net charge(b) a negative charge(c) a positive charge(d) either a negative or a positive charge.

Answer»

Answer:

c)

Explanation:

the positively charged insulator PULLS the free the electron in sphere towards left till electrostatic EQUILIBRIUM is reached. Hence if both sphere are now SEPARATED the sphere 2. has deficiency of electron, i .e ., it has positive charge.

Discussion

18.	Define Basic units of SI system.
Answer» Answer: The INTERNATIONAL System of Units is the modern form of the metric system. It is the only system of MEASUREMENT with an official status in nearly EVERY COUNTRY in the world

18.

Define Basic units of SI system.

Answer»

Answer:

The INTERNATIONAL System of Units is the modern form of the metric system. It is the only system of MEASUREMENT with an official status in nearly EVERY COUNTRY in the world

Discussion

19.	A force of 1000 N is applied about an axis.If the length of the lever which connects the axis and the point of application of force is 1m,what is the moment?
Answer» Answer: If the Mechanical ADVANTAGE is more than 1 or equal to one it ACTS as a force MULTIPLIER and if it is less than one other acts as SPEED multiplier.

19.

A force of 1000 N is applied about an axis.If the length of the lever which connects the axis and the point of application of force is 1m,what is the moment?

Answer»

Answer:

If the Mechanical ADVANTAGE is more than 1 or equal to one it ACTS as a force MULTIPLIER and if it is less than one other acts as SPEED multiplier.

Discussion

20.	6sec . Its speed was its passes the second point is 45m/a. What is its acceleration and the speed at the first point
Answer» Answer: Answer and EXPLANATION: The DISTANCE travelled is, s = 180 m . The time TAKEN is, t = 6 s . The velocity is, v = 45 m / s . The EXPRESSION for the initial velocity is given as, u = v − a t Here, a is the ACCELERATION. Substituting the values in the above expression, u = 45 − 6 a The expression for the acceleration is given as, a = 2 ( s − u t ) t 2 Substituting the values in the above expression, a = 2 ( 180 − ( 45 − 6 a ) 6 ) 6 2 18 a = 36 a − 180 a = 10 m / s 2 Thus, the acceleration is 10 m / s 2 .

20.

6sec . Its speed was its passes the second point is 45m/a. What is its acceleration and the speed at the first point

Answer»

Answer:

Answer and EXPLANATION:

The DISTANCE travelled is,

s

=

180

m

.

The time TAKEN is,

t

=

6

s

.

The velocity is,

v

=

45

m

/

s

.

The EXPRESSION for the initial velocity is given as,

u

=

v

−

a

t

Here,

a

is the ACCELERATION.

Substituting the values in the above expression,

u

=

45

−

6

a

The expression for the acceleration is given as,

a

=

2

(

s

−

u

t

)

t

2

Substituting the values in the above expression,

a

=

2

(

180

−

(

45

−

6

a

)

6

)

6

2

18

a

=

36

a

−

180

a

=

10

m

/

s

2

Thus, the acceleration is

10

m

/

s

2

.

Discussion

21.	Calculate the work done in lifting 100 kg of water through a vertical height of 5 m.
Answer» Answer: 5000 joules Explanation: SIMPLY use mgh = W, if the force is in the direction of displacement of source (mandatory condition)

21.

Calculate the work done in lifting 100 kg of water through a vertical height of 5 m.

Answer»

Answer:

5000 joules

Explanation:

SIMPLY use mgh = W, if the force is in the direction of displacement of source (mandatory condition)

Discussion

22.	Give an example each for surface with less friction and surface witha greater friction .
Answer» Answer: Surfaces which are rough and have irregularities in them are having more friction. Surfaces which are smooth are SAID to have less friction. EXAMPLE- ICY SIDEWALK

22.

Give an example each for surface with less friction and surface witha greater friction .

Answer»

Answer:

Surfaces which are rough and have irregularities in them are having more friction.

Surfaces which are smooth are SAID to have less friction. EXAMPLE- ICY SIDEWALK

Discussion

23.	The direction of the flow of current through electric circuit is
Answer» Answer: We can SAY that the direction of flow of CURRENT DEPENDS on the potential difference. It flows from region of HIGHER potential difference to region of Lower potential difference.

23.

The direction of the flow of current through electric circuit is

Answer»

Answer:

We can SAY that the direction of flow of CURRENT DEPENDS on the potential difference. It flows from region of HIGHER potential difference to region of Lower potential difference.

Discussion

24.	A train starts from a station and stops in the next station in 4 min.The distance is 2 km between two stations. If the train goes the first part of the journey with a uniform acceleration a1 and the second part with a retardation a2 then show that 1/a1+1/a2=4
Answer» ANSWER: Power off dud2 PLZ understand EXPLANATION: plz mark me as BRAINLIEST

24.

A train starts from a station and stops in the next station in 4 min.The distance is 2 km between two stations. If the train goes the first part of the journey with a uniform acceleration a1 and the second part with a retardation a2 then show that 1/a1+1/a2=4

Answer»

ANSWER:

Power off dud2 PLZ understand

EXPLANATION:

plz mark me as BRAINLIEST

Discussion

25.	Name the three kind of friction
Answer» EXPLANATION: *proper* *fractions* *IMPROPER* *fractions* *mixed* *fractions* *FOLLOW* me *and* *mark* *brainliest*

25.

Name the three kind of friction

Answer»

EXPLANATION:

proper fractions
IMPROPER fractions
mixed fractions

FOLLOW me and mark brainliest

Discussion

26.	A train covers half of the journey with a speed of 30m/per second and other half with speed of 40m/per second . Calculate average speed of the entire journey
Answer» Answer: Given: A train covers HALF of the journey with a speed of 30m/per second and other half with speed of 40m/per second. Find: Calculate average speed of the entire journey. Know TERMS: DISTANCE = S. Time taken (1) = $\bold{t_{1}}$ Time taken (2) = $\bold{t_{2}}$ Calculations: $\longrightarrow\bold{s = t1+t2}$ $\longrightarrow\bold{s \times (\dfrac{1}{60} + \dfrac{1}{80})}$ USING formula: $\longrightarrow\bold{\dfrac{s}{t1+t2}}$ Calculations: $\longrightarrow\bold{\dfrac{240}{7}}$ $\longrightarrow{\sf{\underline{\boxed{\red{\sf{34.28 \: m/s}}}}}}$

26.

A train covers half of the journey with a speed of 30m/per second and other half with speed of 40m/per second . Calculate average speed of the entire journey

Answer»

Answer:

Given:

A train covers HALF of the journey with a speed of 30m/per second and other half with speed of 40m/per second.

Find:

Calculate average speed of the entire journey.

Know TERMS:

DISTANCE = S.
Time taken (1) = $\bold{t_{1}}$
Time taken (2) = $\bold{t_{2}}$

Calculations:

$\longrightarrow\bold{s = t1+t2}$

$\longrightarrow\bold{s \times (\dfrac{1}{60} + \dfrac{1}{80})}$

USING formula:

$\longrightarrow\bold{\dfrac{s}{t1+t2}}$

Calculations:

$\longrightarrow\bold{\dfrac{240}{7}}$

$\longrightarrow{\sf{\underline{\boxed{\red{\sf{34.28 \: m/s}}}}}}$

Discussion

27.	Give reason for the apparent position of the star
Answer» Answer: The APPARENT position is its position as SEEN by a theoretical observer at thecentre of the moving Earth. Several effects cause the apparent position to differ from the MEAN position: Annual aberration — a deflection caused by the velocity of the Earth's motion around the SUN, relative to an INERTIAL frame. mark me as brainliest dude gimme a thnx :)

27.

Give reason for the apparent position of the star

Answer»

Answer:

The APPARENT position is its position as SEEN by a theoretical observer at thecentre of the moving Earth. Several effects cause the apparent position to differ from the MEAN position: Annual aberration — a deflection caused by the velocity of the Earth's motion around the SUN, relative to an INERTIAL frame.

mark me as brainliest dude

gimme a thnx :)

Discussion

28.	Answer it. no scamplease be serious while answering.
Answer» Explanation: ANSWER:- Basics of Parallel Combination:- Parallel combination is the reciprocal of summession of RESISTANCES According to Formula, if I take Parallel RESISTANCE AS x, $\frac{1}{x} = \frac{1}{y1} + \frac{1}{y2} + \frac{1}{y3}$ Where y1, y2 and y3 are other Resistances So, we can see that The value of actual Resistance decreases when combined in Parallel combination. We derive that Parallel resistances ACTUALLY decrease the resistance as offered earlier due to reciprocal. Basics of Series combination:- Series combination is simple addition of all Resistances According to formula, if x is equivalent resistance $x = y1 + y2 + y3$ Where all y1, y2 and y3 are other Resistances So, series resistances increase the resistance AS offered earlier. According to Question:- We need to find the parallel resistance As A has LOWER path, A is having parallel combination due to less resistance offered . Things to Note:- ALWAYS see whether there is V-I or I-V graph I-V graph tales the reciprocal of Resistances. This graph is a V-I graph, so resistances are taken standard. Hence, A is the option.

28.

Answer it. no scamplease be serious while answering.

Answer»

Explanation:

ANSWER:-

Basics of Parallel Combination:-

Parallel combination is the reciprocal of summession of RESISTANCES
According to Formula, if I take Parallel RESISTANCE AS x,

$\frac{1}{x} = \frac{1}{y1} + \frac{1}{y2} + \frac{1}{y3}$

Where y1, y2 and y3 are other Resistances
So, we can see that
The value of actual Resistance decreases when combined in Parallel combination.

We derive that Parallel resistances ACTUALLY decrease the resistance as offered earlier due to reciprocal.

Basics of Series combination:-

Series combination is simple addition of all Resistances
According to formula, if x is equivalent resistance

$x = y1 + y2 + y3$

Where all y1, y2 and y3 are other Resistances
So, series resistances increase the resistance AS offered earlier.

According to Question:-

We need to find the parallel resistance
As A has LOWER path, A is having parallel combination due to less resistance offered .

Things to Note:-

ALWAYS see whether there is V-I or I-V graph
I-V graph tales the reciprocal of Resistances.
This graph is a V-I graph, so resistances are taken standard.

Hence, A is the option.

Discussion

29.	Why mercury preferred over the alchol in thermometer
Answer» Mercury has a much GREATER conductivity than alcohol and expands rapidly, and thus INDICATES a temperature CHANGE quickly. ... Mercury does not wet glass but alcohol because of its CONCAVE meniscus tends to cling to the walls of stem of the thermometer. follow me please... Mark as BRAINLIEST please...

29.

Why mercury preferred over the alchol in thermometer

Answer»

Mercury has a much GREATER conductivity than alcohol and expands rapidly, and thus INDICATES a temperature CHANGE quickly. ... Mercury does not wet glass but alcohol because of its CONCAVE meniscus tends to cling to the walls of stem of the thermometer.

follow me please...

Mark as BRAINLIEST please...

Discussion

30.	When four 40 W, 220 V bulbs are connected in series to a source of 220 V, find the current flowing in each. If one of the bulb fuses, what will be the current drawn from the source of 220 V ?
Answer» Answer: It depends on the ‘design voltage’. If it is an Incaandescent Light Bulb, and is DESIGNED for a working voltaage of 220 Volts, then for the first 10 to 20 cycles of POWER, the filiaament will be cold, and since it will not be ‘hot ‘ yet, then the resistance will be approximtely 1/10 of the nominal value when oepraating. However, this question only states “ A bulb of 40 Watts” and does not state the type of bulb: CFL , Incndescent, LED, LinearFluorescent etc. So, with that in mind, and other answers here. Also, the question neglects to tell us DC or AC, since The Type matters, and follows these ‘rules’ LED : Both Incandescent Both CFL , AC only Fluorescent: AC only. Given what is missing, the rest are all GUESSES, and like all estimates are subject to revision. If it was an Incandescent, and was designed for 200 V, what happens then? Well, insteaad of lsting 1,000 hours of design life, it may be down to 100. So for 100 hours it will GLOW EXTREMELY bright, since it is a 200 Volt bulb in a circuit designed for 220. PLEASE CHOOSE AS BRAINLIEST Explanation:

30.

When four 40 W, 220 V bulbs are connected in series to a source of 220 V, find the current flowing in each. If one of the bulb fuses, what will be the current drawn from the source of 220 V ?

Answer»

Answer:

It depends on the ‘design voltage’.

If it is an Incaandescent Light Bulb, and is DESIGNED for a working voltaage of 220 Volts, then for the first 10 to 20 cycles of POWER, the filiaament will be cold, and since it will not be ‘hot ‘ yet, then the resistance will be approximtely 1/10 of the nominal value when oepraating.

However, this question only states “ A bulb of 40 Watts” and does not state the type of bulb: CFL , Incndescent, LED, LinearFluorescent etc.

So, with that in mind, and other answers here.

Also, the question neglects to tell us DC or AC, since The Type matters, and follows these ‘rules’

LED : Both

Incandescent Both

CFL , AC only

Fluorescent: AC only.

Given what is missing, the rest are all GUESSES, and like all estimates are subject to revision.

If it was an Incandescent, and was designed for 200 V, what happens then?

Well, insteaad of lsting 1,000 hours of design life, it may be down to 100.

So for 100 hours it will GLOW EXTREMELY bright, since it is a 200 Volt bulb in a circuit designed for 220.

PLEASE CHOOSE AS BRAINLIEST

Explanation:

Discussion

31.	A point moves with velocity v = (6t^2 + 4) m/s . Find the distance covered by the point during 5 seconds from the beginning of motion
Answer» Answer:270 m Explanation:

31.

A point moves with velocity v = (6t^2 + 4) m/s . Find the distance covered by the point during 5 seconds from the beginning of motion

Answer»

Answer:270 m

Explanation:

Discussion

32.	What charge would be required to electrify a sphere of radius 25cm so as to get a surface charge density of 3÷π cm^-2
Answer» Use this FORMULA : Surface CHARGE density = charge/area for SPHERE , Surface charge density = charge/4πr²

32.

What charge would be required to electrify a sphere of radius 25cm so as to get a surface charge density of 3÷π cm^-2

Answer»

Use this FORMULA :

Surface CHARGE density = charge/area

for SPHERE ,

Surface charge density = charge/4πr²

Discussion

33.	A force of 20N is applied at a perpendicular distance of 4m from a pivot.What is the moment?
Answer» moment = F × d given: F = 20N, d = 4 m moment = 20 × 4 => 80 NM

33.

A force of 20N is applied at a perpendicular distance of 4m from a pivot.What is the moment?

Answer»

moment = F × d

given: F = 20N, d = 4 m

moment = 20 × 4

=> 80 NM

Discussion

34.	Give any two example where we need higher friction.
Answer» Answer: For example, vehicles can't move on a road covered with snow. In such CASES we have to THROW sand on the road to increase the FRICTION. When you apply the brakes in a CAR, you again increase contact area and FORCE. ... The relatively constant friction between the tires and the road then slows the car down.

34.

Give any two example where we need higher friction.

Answer»

Answer:

For example, vehicles can't move on a road covered with snow. In such CASES we have to THROW sand on the road to increase the FRICTION. When you apply the brakes in a CAR, you again increase contact area and FORCE. ... The relatively constant friction between the tires and the road then slows the car down.

Discussion

35.	If summation of two unit vectors has magnitude , then angle between the unit vectors is
Answer» Answer: As question said.... Sum of 2 unit vector is a unit vector.. Lets call these 2 unit vectors as A and B vector. This MEANS, magnitude of A=1 magnitude of B=1 magnitude of A+B=1 Now as you MAY recall the formula we studied... magnitude of (A+B)= SQRT(A2+B2+2ABcos(x)) Here x represents the ANGLE between 2 vectors (A and B) Now plugging the values as A=1 B=1 And A+B=1 We can get cos (x) =-0.5 And this means x=120 degrees Once part of the question over... For the second part... Subtracting 2 vectors say A and B in this case is same as adding A and - B A-B=A + (-B) This means as we reverse the side of B.... B becomes -B Now add - B to A Here actually the x will change from 120 to 60 degrees... As explained in the figure. So A+(-B) =sqrt(A2+B2+2ABcos(60)) =sqrt(3) PLEASE CHOOSE AS BRAINLIEST

35.

If summation of two unit vectors has magnitude , then angle between the unit vectors is

Answer»

Answer:

As question said.... Sum of 2 unit vector is a unit vector..

Lets call these 2 unit vectors as A and B vector.

This MEANS,

magnitude of A=1

magnitude of B=1

magnitude of A+B=1

Now as you MAY recall the formula we studied...

magnitude of (A+B)= SQRT(A2+B2+2ABcos(x))

Here x represents the ANGLE between 2 vectors (A and B)

Now plugging the values as

A=1

B=1

And A+B=1

We can get cos (x) =-0.5

And this means x=120 degrees

Once part of the question over...

For the second part...

Subtracting 2 vectors say A and B in this case is same as adding A and - B

A-B=A + (-B)

This means as we reverse the side of B.... B becomes -B

Now add - B to A

Here actually the x will change from 120 to 60 degrees...

As explained in the figure.

So

A+(-B) =sqrt(A2+B2+2ABcos(60))

=sqrt(3)

PLEASE CHOOSE AS BRAINLIEST

Discussion

36.	Describe briefly he features of a domestic electric wiring system which helps to make the system safe
Answer» Explanation: The main features of domestic wiring are: (i) The electric SUPPLY from the mains is delivered to our homes using a THREE core cable. Three core cable is usually overhead electric poles or underground CABLES. One of these wires with red insulation COVER is called LIVE wire which brings in the current.

36.

Describe briefly he features of a domestic electric wiring system which helps to make the system safe

Answer»

Explanation:

The main features of domestic wiring are: (i) The electric SUPPLY from the mains is delivered to our homes using a THREE core cable. Three core cable is usually overhead electric poles or underground CABLES. One of these wires with red insulation COVER is called LIVE wire which brings in the current.

Discussion

37.	If the force F,accelaration A and time T are taken as fundamental units,then find the dimensions of energy E
Answer» ANSWER: $w = f.s$ DIMENSION of ENERGY is (MLT^-2) . L =. ML^2T^-2

37.

If the force F,accelaration A and time T are taken as fundamental units,then find the dimensions of energy E

Answer»

ANSWER:

$w = f.s$

DIMENSION of ENERGY is (MLT^-2) . L

=. ML^2T^-2

Discussion

38.	4.002×10^-7/75Answer step by step
Answer» Answer: 5.336e-9 HOPE it will be helpfull

38.

4.002×10^-7/75Answer step by step

Answer»

Answer:

5.336e-9

HOPE it will be helpfull

Discussion

39.	Two persons a and b want to move the box.a it just standing,while b is pushing the box in which case will the box move ?why?
Answer» ANSWER: when B will PUSH the box it will MOVE Explanation: as B apply FORCE to the box to over come the frictional force and move

39.

Two persons a and b want to move the box.a it just standing,while b is pushing the box in which case will the box move ?why?

Answer»

ANSWER:

when B will PUSH the box it will MOVE

Explanation:

as B apply FORCE to the box to over come the frictional force and move

Discussion

40.	What is one dimensional elastic collision?
Answer» Answer: An elastic collision is one that conserves INTERNAL KINETIC energy. CONSERVATION of kinetic energy and MOMENTUM together allow the final velocities to be calculated in TERMS of initial velocities and masses in one dimensional two-body collisions.

40.

What is one dimensional elastic collision?

Answer»

Answer:

An elastic collision is one that conserves INTERNAL KINETIC energy. CONSERVATION of kinetic energy and MOMENTUM together allow the final velocities to be calculated in TERMS of initial velocities and masses in one dimensional two-body collisions.

Discussion

41.	A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground.
Answer» ANSWER: what have to FIND , I couldn't UNDERSTAND that

41.

A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground.

Answer»

ANSWER:

what have to FIND , I couldn't UNDERSTAND that

Discussion

42.	Magnification produced by a SPERICAL MIRROR
Answer» Answer: The magnification produced by a SPHERICAL mirror is -3 Mark as BRAINLIEST THANKS

42.

Magnification produced by a SPERICAL MIRROR

Answer»

Answer:

The magnification produced by a SPHERICAL mirror is -3

Mark as BRAINLIEST THANKS

Discussion

43.	A 100 watt electric bulb is used for 5 hours daily and four 60 watt bulbs are used for 5 hours daily. calculate the energy e (in kWh) in the month of January
Answer» Answer: Explanation: power of 1 electric bulb = 100w=0.1kw energy =0.1 × 5 =0.5kwh power of 2 bulb =60w=0.06kw energy for 4 bulbs= 0.06×4×5=1.2 kwh total energy= 0.5+1.2=1.7kwh in MONTH of jan ,total energy=1.7×31=52.7kwh hope it'll help ....... PLEASE CHOOSE AS BRAINLIEST

43.

A 100 watt electric bulb is used for 5 hours daily and four 60 watt bulbs are used for 5 hours daily. calculate the energy e (in kWh) in the month of January

Answer»

Answer:

Explanation:

power of 1 electric bulb = 100w=0.1kw

energy =0.1 × 5 =0.5kwh

power of 2 bulb =60w=0.06kw

energy for 4 bulbs= 0.06×4×5=1.2 kwh

total energy= 0.5+1.2=1.7kwh

in MONTH of jan ,total energy=1.7×31=52.7kwh

hope it'll help

.......

PLEASE CHOOSE AS BRAINLIEST

Discussion

44.	Draw the orientation of electric dipole moment (p) in a uniform electric field (E) such that the dipole experiencesa) Maximum torqueb) Minimum torquec) Half of the maximum torqued) 1/√2 times maximum torquee) 76.6% of maximum torque
Answer» ANSWER: I can't understand Explanation: SORRY FRIEND

44.

Draw the orientation of electric dipole moment (p) in a uniform electric field (E) such that the dipole experiencesa) Maximum torqueb) Minimum torquec) Half of the maximum torqued) 1/√2 times maximum torquee) 76.6% of maximum torque

Answer»

ANSWER:

I can't understand

Explanation:

SORRY FRIEND

Discussion

45.	A force F is given by, F=at^2 where t is time What are dimensions of are.......
Answer» Answer: HEY buddy here is your ans a=[MLT⁻⁴] Explanation: DIMENSION of F=[MLT⁻²] F=at² ⇒[MLT⁻²] = at² ⇒ a=[MLT⁻⁴] Mark me as Brainliest...

45.

A force F is given by, F=at^2 where t is time What are dimensions of are.......

Answer»

Answer:

HEY buddy here is your ans

a=[MLT⁻⁴]

Explanation:

DIMENSION of F=[MLT⁻²]

F=at²

⇒[MLT⁻²] = at²

⇒ a=[MLT⁻⁴]

Mark me as Brainliest...

Discussion

46.	Hey guys free points with easy question
Answer» EXPLANATION: THANKS for FREE POINTS and I am very HAPPY

46.

Hey guys free points with easy question

Answer»

EXPLANATION:

THANKS for FREE POINTS and I am very HAPPY

Discussion

47.	Please this question solve
Answer» ANSWER: I am a man Explanation: kwaccha gonna you do when hulkamania LOOK WALL of you

47.

Please this question solve

Answer»

ANSWER:

I am a man

Explanation:

kwaccha gonna you do when hulkamania LOOK WALL of you

Discussion

48.	A metal block has length 50cm, breadth 30cm and thickness 20cm. When current passes through it parallel to its length and parallel to its breadth, the ratio of maximum to minimum resistance of that block is?
Answer» Answer: 30000 Explanation: 50×30×20=30000

48.

A metal block has length 50cm, breadth 30cm and thickness 20cm. When current passes through it parallel to its length and parallel to its breadth, the ratio of maximum to minimum resistance of that block is?

Answer»

Answer:

30000

Explanation:

50×30×20=30000

Discussion

49.	A wooden piece of 100 gwt is put in water, then in saline water and finally in kerosene. It floats in all the three liquids. Identify the liquid in which the block experiences greater buoyancy.
Answer» ANSWER:in SALIN water Explanation:because it has more viscosity then other three LIQUIDS

49.

A wooden piece of 100 gwt is put in water, then in saline water and finally in kerosene. It floats in all the three liquids. Identify the liquid in which the block experiences greater buoyancy.

Answer»

ANSWER:in SALIN water

Explanation:because it has more viscosity then other three LIQUIDS

Discussion

50.	A car travels 30km at a uniform speed 30km/h and the next 30km at a uniform speed of 60km/h. The average speed of the car is : (a) 45km/h (b) 50km/h (c) 40km/h (d) None of the three.
Answer» A car travels 30km at a UNIFORM speed 30km/hr and the next 30km at a uniform speed of 60km/hr. We have to find the AVERAGE speed of the car. Now, Average speed is defined as the ratio of total DISTANCE covered with respect to total time TAKEN. Whereas average velocity is defined as the ratio of total displacement with respect to total time taken. As the distance covered by the car is same i.e. 30 km. So, the total distance covered by the car is 60 km (30+30). Also, Time = Distance/Speed t1 = 30/30 hr and t2 = 30/60 hr Total time taken = t1 + t2 = 1 + 1/2 = 3/2 hr Average speed = (Total distance covered)/(Total time taken) = 60/(3/2) = 40 THEREFORE, the average speed of the car is 40 km/hr. Option (c) 40 km/hr

50.

A car travels 30km at a uniform speed 30km/h and the next 30km at a uniform speed of 60km/h. The average speed of the car is : (a) 45km/h (b) 50km/h (c) 40km/h (d) None of the three.

Answer»

A car travels 30km at a UNIFORM speed 30km/hr and the next 30km at a uniform speed of 60km/hr.

We have to find the AVERAGE speed of the car.

Now,

Average speed is defined as the ratio of total DISTANCE covered with respect to total time TAKEN. Whereas average velocity is defined as the ratio of total displacement with respect to total time taken.

As the distance covered by the car is same i.e. 30 km. So, the total distance covered by the car is 60 km (30+30).

Also,

Time = Distance/Speed

t1 = 30/30 hr and t2 = 30/60 hr

Total time taken = t1 + t2

= 1 + 1/2

= 3/2 hr

Average speed = (Total distance covered)/(Total time taken)

= 60/(3/2)

= 40

THEREFORE, the average speed of the car is 40 km/hr.

Option (c) 40 km/hr

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What is the electric field due to : 1) Point charge 2) Line charge 3) Sheet of charge 4) Spherical conducting shell

Parallelogram law of analytics sa result and calculation nekalna?​

ANSWER:

Answer from photo no. 10

Calculate solar day in second

The resistant or tha fuse wire is(1)low (2)moderate (3) zero (4)very high

Is plasma related with the glowing of ?

Answer:

Acceleration is a vector quantity, which indicates that its value 1 point (a) Is always negative (b) Is always positive (c) Is zero (d) Can be positive, negative or zero

What is the nature of force between the two charges if q1 >0 and q2 >0 or q1

Define Basic units of the SI system.

AA person completes a round of circular trackof radius R in 40 second s. At the end of 2 minutes,displacement will be​

An elephant having mass of 300kg is standing on a concrete bridge of length 8m and breadth 4m. Calculate the pressure exerted by the elephant on the bridge. Given, acceleration due to gravity is 9.8m/s

Hey guys letzz begin with the quiz !!the first question is ......name the first element of the periodic element do follow me to get notified with the next questions and to view the results ​

Wht is meant by torque​

The formation of for during winter is the example of dash​

How can you minimise the rolling friction..​

Two cars a and b race each other. the car a ran for​

Define Basic units of SI system.

Answer:

A force of 1000 N is applied about an axis.If the length of the lever which connects the axis and the point of application of force is 1m,what is the moment?

6sec . Its speed was its passes the second point is 45m/a. What is its acceleration and the speed at the first point

Calculate the work done in lifting 100 kg of water through a vertical height of 5 m.

Give an example each for surface with less friction and surface witha greater friction .

The direction of the flow of current through electric circuit is

A train starts from a station and stops in the next station in 4 min.The distance is 2 km between two stations. If the train goes the first part of the journey with a uniform acceleration a1 and the second part with a retardation a2 then show that 1/a1+1/a2=4

Name the three kind of friction​

A train covers half of the journey with a speed of 30m/per second and other half with speed of 40m/per second . Calculate average speed of the entire journey​

Answer:

Given:

Find:

Know TERMS:

Calculations:

USING formula:

Calculations:

Give reason for the apparent position of the star

Answer it. no scamplease be serious while answering.​

ANSWER:-

Basics of Parallel Combination:-

Basics of Series combination:-

According to Question:-

Things to Note:-

Hence, A is the option.

Why mercury preferred over the alchol in thermometer​

When four 40 W, 220 V bulbs are connected in series to a source of 220 V, find the current flowing in each. If one of the bulb fuses, what will be the current drawn from the source of 220 V ?​

A point moves with velocity v = (6t^2 + 4) m/s . Find the distance covered by the point during 5 seconds from the beginning of motion

What charge would be required to electrify a sphere of radius 25cm so as to get a surface charge density of 3÷π cm^-2​

A force of 20N is applied at a perpendicular distance of 4m from a pivot.What is the moment?

Give any two example where we need higher friction.​

If summation of two unit vectors has magnitude , then angle between the unit vectors is

Describe briefly he features of a domestic electric wiring system which helps to make the system safe

If the force F,accelaration A and time T are taken as fundamental units,then find the dimensions of energy E

4.002×10^-7/75Answer step by step

Two persons a and b want to move the box.a it just standing,while b is pushing the box in which case will the box move ?why?

What is one dimensional elastic collision?

Answer:

A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground.

Magnification produced by a SPERICAL MIRROR

The magnification produced by a SPHERICAL mirror is -3

Mark as BRAINLIEST THANKS

A 100 watt electric bulb is used for 5 hours daily and four 60 watt bulbs are used for 5 hours daily. calculate the energy e (in kWh) in the month of January​

Draw the orientation of electric dipole moment (p) in a uniform electric field (E) such that the dipole experiencesa) Maximum torqueb) Minimum torquec) Half of the maximum torqued) 1/√2 times maximum torquee) 76.6% of maximum torque

A force F is given by, F=at^2 where t is time What are dimensions of are.......

Hey guys free points with easy question​

Please this question solve​

A metal block has length 50cm, breadth 30cm and thickness 20cm. When current passes through it parallel to its length and parallel to its breadth, the ratio of maximum to minimum resistance of that block is?

A wooden piece of 100 gwt is put in water, then in saline water and finally in kerosene. It floats in all the three liquids. Identify the liquid in which the block experiences greater buoyancy.​

A car travels 30km at a uniform speed 30km/h and the next 30km at a uniform speed of 60km/h. The average speed of the car is : (a) 45km/h (b) 50km/h (c) 40km/h (d) None of the three.

Option (c) 40 km/hr

Parallelogram law of analytics sa result and calculation nekalna?

AA person completes a round of circular trackof radius R in 40 second s. At the end of 2 minutes,displacement will be

Hey guys letzz begin with the quiz !!the first question is ......name the first element of the periodic element do follow me to get notified with the next questions and to view the results

Wht is meant by torque

The formation of for during winter is the example of dash

How can you minimise the rolling friction..

Two cars a and b race each other. the car a ran for

Name the three kind of friction

A train covers half of the journey with a speed of 30m/per second and other half with speed of 40m/per second . Calculate average speed of the entire journey

Answer it. no scamplease be serious while answering.

Why mercury preferred over the alchol in thermometer

When four 40 W, 220 V bulbs are connected in series to a source of 220 V, find the current flowing in each. If one of the bulb fuses, what will be the current drawn from the source of 220 V ?

What charge would be required to electrify a sphere of radius 25cm so as to get a surface charge density of 3÷π cm^-2

Give any two example where we need higher friction.

A 100 watt electric bulb is used for 5 hours daily and four 60 watt bulbs are used for 5 hours daily. calculate the energy e (in kWh) in the month of January

Hey guys free points with easy question

Please this question solve

A wooden piece of 100 gwt is put in water, then in saline water and finally in kerosene. It floats in all the three liquids. Identify the liquid in which the block experiences greater buoyancy.