67486 + Interview Questions in Secondary School in Physics

1.	a wooden block of mass 0.010 kg is dropped from the top of a cliff 100 m high. simultaneously A bullet of mass 0.010 kg is fired from the foot of a cliff upward with a velocity of 100 m per second. the bullet and the wooden block will meet each other after the time in seconds is?
Answer» HIIII dear________❤️❤️ good afternoon___________✌️✌️✌️✌️✌️ Let they MEET after t second If block travels 's'm distance then in same TIME the bullet travells(100-s)m For block s=0×t+12s=0×t+12×10×t2×10×t2 For bullet 100−s=100×t+12100−s=100×t+12(−10)×t2(−10)×t2 Solving this; we GET t=1second

Discussion

2.	a train starting from rest with the uniform acceleration of 0.2 meters per second for 5 minute calculate the speed and distance traveled with him
Answer» INITIAL VELOCITY (v)= 0m (as it starts from rest) Acceleration (a)= 0.2m/s^2 Time (t)=5 MINUTE = 5×60 = 300s Let final velocity be v Using acceleration formula a=(v-u)/t 0.2 = v/300 60 =v So, final velocity was 60m/s. Let distance be s Using second equation of motion s=ut+(1/2)at^2 s= (0)(300)+(1/2)(0.2)(300)^2 =9000m So, the distance covered by the train was 9000m or 9km. Read more on Brainly.in - brainly.in/question/1252634#readmore

Discussion

3.	Solve it send me pic
Answer» 54km/h,0 because the CAR MOVED EASTWARD

Discussion

4.	Rain appears to fall vertically downward to a man moving with a velocity of 4m/sec. When he doubles his speed then the rain appears to strike him at an angle of 45 degree with the horiozontal. Then what is the actual velocity of rain drop?I don't need any Google answers please do not copy and paste the answer
Answer» The speed of the RAINDROP is 4 √2 m/s and the angle is 45°. Explanation: Initial velocity of the man, me = 4 m/s Final velocity of the man, m'e = 8 m/s m'm = m'e - me = 8 - 4 = 4 m/s tan 45 = rm/m'm rm = (m'm) tan 45 = 1 re = √(rm)^2 + (me)^2 = 4 √2 m/s θ = tan^-1 (me / rm) = tan^-1 (1) θ = 45° degree Hence the speed of the raindrop is 4 √2 m/s and the angle is 45°. ALSO learn more Rain is falling vertically downwards with a velocity of 3 km/hr. a man WALKS in the rain with a velocity of 4 km/hr. the raindrops will FALL on the man with a velocity of? brainly.in/question/4750322

4.

Rain appears to fall vertically downward to a man moving with a velocity of 4m/sec. When he doubles his speed then the rain appears to strike him at an angle of 45 degree with the horiozontal. Then what is the actual velocity of rain drop?I don't need any Google answers please do not copy and paste the answer

Answer»

The speed of the RAINDROP is 4 √2 m/s and the angle is 45°.

Explanation:

Initial velocity of the man, me = 4 m/s

Final velocity of the man, m'e = 8 m/s

m'm = m'e - me = 8 - 4 = 4 m/s

tan 45 = rm/m'm

rm = (m'm) tan 45 = 1

re = √(rm)^2 + (me)^2 = 4 √2 m/s

θ = tan^-1 (me / rm) = tan^-1 (1)

θ = 45° degree

Hence the speed of the raindrop is 4 √2 m/s and the angle is 45°.

ALSO learn more

Rain is falling vertically downwards with a velocity of 3 km/hr. a man WALKS in the rain with a velocity of 4 km/hr. the raindrops will FALL on the man with a velocity of?

brainly.in/question/4750322

Discussion

5.	how will you give equal and opposite charge to two identical metal spheres on insulated stands? you can use a charged rod but touching of rod to sphere is not allowed.
Answer» Hola User__________________ Here is Your Answer...!!!!!!! ___________________________ ☆Actually welcome to the concept of the ELECTROSTATICS and charge production on the insulated bodies placed at the infinite...... ☆Basically we know that ........The two bodies are placed at the insulated stand ...thus initially both have. ...q = 0 ..... ☆So now here ..such that we have to create a equal and opposite charge on both the sphere ...without touching the source charged ROD to any one of them.... ☆so basically ..what we will do..... ☆We will first ..held the rod at some distance R from any of the insulated body ..... such that ...due to closer of charged body ....there will be PHENOMENAL of INDUCTION of charge on the sphere from the distance.... ☆So now here the surface near to the rod will have induced charge at the near surface and the other surface of the which is away from rod will have opposite induced charge ...... ☆Now our one sphere has both charges on its opposite surfaces ...so now here we will connect a distribution wire from any one of the charged surface to the other sphere ..such that ...the earthing of one surface will be held on first sphere and the charge will be flowed from the distribution wire to the ANOTHER sphere .... ☆This flowed charge will charge the second sphere wholly opposite of the first sphere ..... ☆and thus here two spheres with equal and opposite charge are created without touch in the rod to any sphere ..... _____________________________ Hope it helps u.......☺

Discussion

6.	if a body starts from rest and accelerate at a constant rate of 10m/s how much distance will it cover in 2sec
Answer» GIVEN:u=0 a=10 t=2 s=? s=ut+1/2 at^2 =02+1/21022 = 0+20 = 20M

6.

if a body starts from rest and accelerate at a constant rate of 10m/s how much distance will it cover in 2sec

Answer»

GIVEN:u=0

a=10

t=2

s=?

s=ut+1/2 at^2

=0*2+1/2*10*2*2

= 0+20

= 20M

Discussion

7.	Hey !!!Please solve my doubt refer to the attachment ✔ Question no. 16 !!! ___________________
Answer» v^2=u^2+2as 0=(16)^2+2a*0.4 256/0.8=a a=320m/s^2 v=u+at 0=16+320t t=16/320 t=0.05s

7.

Hey !!!Please solve my doubt refer to the attachment ✔ Question no. 16 !!! ___________________

Answer»

v^2=u^2+2as

0=(16)^2+2a*0.4

256/0.8=a

a=320m/s^2

v=u+at

0=16+320t

t=16/320

t=0.05s

Discussion

8.	Examples of Newton's first law of motion
Answer» NEWTONS FIRST law of MOTION states that, An object at rest will remain at rest and an object in motion will remain in motion unless acted upon by an unbalanced force. Example 1 A skateboarder is riding down a HILL, and hits a rock, the skateboard will be stopped but the person on the skateboard will continue his motion. (when in motion) Example 2 If there is a BALL on the ground and someone kicks the ball. (when object is at rest)

8.

Examples of Newton's first law of motion

Answer»

NEWTONS FIRST law of MOTION states that, An object at rest will remain at rest and an object in motion will remain in motion unless acted upon by an unbalanced force.

Example 1

A skateboarder is riding down a HILL, and hits a rock, the skateboard will be stopped but the person on the skateboard will continue his motion. (when in motion)

Example 2

If there is a BALL on the ground and someone kicks the ball. (when object is at rest)

Discussion

9.	A person driving a car with 72km/h,suddenly sees a boy. if the distance moved by a car, before person applies the brakes is 5m,the reaction time of person is?
Answer» By USING FORMULA the ANSWER is 4

Discussion

10.	Examples for Newton's third law of motion
Answer» Hi dear when we JUMP in a POOL or lake water moves up ,this is DUE to THIRD LAW of motion when rocket moves up it gives same force downward.

Discussion

11.	What will be the stopping distance if the initial velocity is doubled?
Answer» If the INITIAL velocity is doubled, Then the STOPPING DISTANCE BECOME 4 times. From the third equation, v^2=u^2-2as u^2= v^2+2as From this equation distance (s) is directly PROPORTIONAL to u^2.

Discussion

12.	An object of mass m held against avertical wall by applying horizontalforce F as shown in the fi gure. Th eminimum value of the force F is
Answer» I THINK you have FORGOTTEN to ADD FIGURE

Discussion

13.	an object thrown vertically up from the ground passes the height 5 M twice in an interval of 10 second what is its time of flight
Answer» i am not sure if this HELPS but.... you can use time=distance/speed which MEANS t= 10m/10sec = 1 sec/m² i am not sure how many intervals there were. can you EXPLAIN it if my ANSWER is wrong

13.

an object thrown vertically up from the ground passes the height 5 M twice in an interval of 10 second what is its time of flight

Answer»

i am not sure if this HELPS but....

you can use time=distance/speed

which MEANS

t= 10m/10sec = 1 sec/m²

i am not sure how many intervals there were.

can you EXPLAIN it if my ANSWER is wrong

Discussion

14.	When a car takes a sudden left turn inthe curved road, passengers are pushedtowards the right due to
Answer» DUE to INERTIA of DIRECTION

Discussion

15.	A car accelerates at a rate of 5 M per second square.find the increase its velocity in 2 seconds
Answer» ANSWER: EXPLANATION: FINAL velocity=5*2=10m/s,HENCE INCREASE is by 10m/s

15.

A car accelerates at a rate of 5 M per second square.find the increase its velocity in 2 seconds

Answer»

ANSWER:

EXPLANATION:

FINAL velocity=5*2=10m/s,HENCE INCREASE is by 10m/s

Discussion

16.	What is the speed of light in water
Answer» 2.25E8 m/s. is SPEED of li8 in WATER

Discussion

17.	what would be the force required to produce an acceleration of 2m/sec square in a body of mass 12 kg?what would be the acceleration if the force doubled
Answer» F =M ×A F=12×2=24N NOW IT A IS DOUBLED I.e a =4m/s SQUARE then F =12×4 =48 N

Discussion

18.	Solve these questions
Answer» Linear motion beacause the NET FORCE is MOVING vertically up and down in a straight line with constant VELOCITY

Discussion

19.	Ghanatwa ka si matrak
Answer» As. (Kg/m^3). You should SEE the FORMULA for DENSITY that is EQUAL to mass/volume (dravyaman/aaetan)

Discussion

20.	Answer these two questions
Answer» Common PLACES were we can SEE elevator: super market, textile, shopping malls ,OFFICE, court,Marts ,film theatres, bazaars, SHOW rooms, FOOD courts et cetera

Discussion

21.	What is the maximum speeds of sound?
Answer» 1238 km/h or 770 MPH

Discussion

22.	Wayas to lft maximum weight in benchpress
Answer» 100CM is the MINIMUM HEIGHT

Discussion

23.	Why the shapes of automobiles towards front ?
Answer» HEY Guys, AERODYNAMICS is important reason of making shapes of automobiles TOWARD FRONT as well as to give a STYLISH look to the car . Thanks.

Discussion

24.	Velocity of car increases from 40m/s to 80m/s in 10s.find average speed
Answer» AVERAGE SPEED is 60km/h

Discussion

25.	Why do we rub our hands together in winter
Answer» Because when we RUB our hands then our PALM GET heated DUE to the friction

Discussion

26.	projectile motion from ground to ground.if maximum height is 30√3and horizontal range is 120mfind initial velicity and angle
Answer» DEAR HOPE it HELP you.

Discussion

27.	a car is starting from rest accelerates at rate f through a distance s then continues at constant speed for time t and then decelerates at constant rate f/2 to come to rest if total distance is 15S then 1)s=ft (2) s=ft^2/6 (3)s=ft^2/48 (4)s=ft^2/72
Answer» HOPE U GET the SOLUTION

Discussion

28.	two vectors of equal magnitude P are inclined at some angle such that the difference in the magnitude of resultant and magnitude of either of the vectors is 0.732 X either of the magnitude of vector if the angle between them is increased by the half of its initial value then find the magnitude of difference of two vectors
Answer» Let each vector has a MAGNITUDE a which makes an angle θ between them HENCE the resultant (R) of these equal vectors R=a2+a2+2a⋅acosθ−−−−−−−−−−−−−−−−√ =2a2+2a2cosθ−−−−−−−−−−−−√ =a2–√1+cosθ−−−−−−−√ =a2–√1+2cos2θ2−1−−−−−−−−−−−−−√ =a2–√2cos2θ2−−−−−−√ =a2–√2–√cosθ2 =2acosθ2 & the resultant will be EQUALLY inclined at an angle θ2 with the equal vectors or the resultant acts ALONG the angle bisector of both the equal vectors

28.

two vectors of equal magnitude P are inclined at some angle such that the difference in the magnitude of resultant and magnitude of either of the vectors is 0.732 X either of the magnitude of vector if the angle between them is increased by the half of its initial value then find the magnitude of difference of two vectors

Answer»

Let each vector has a MAGNITUDE a which makes an angle θ between them HENCE the resultant (R) of these equal vectors

R=a2+a2+2a⋅acosθ−−−−−−−−−−−−−−−−√

=2a2+2a2cosθ−−−−−−−−−−−−√

=a2–√1+cosθ−−−−−−−√

=a2–√1+2cos2θ2−1−−−−−−−−−−−−−√

=a2–√2cos2θ2−−−−−−√

=a2–√2–√cosθ2

=2acosθ2

& the resultant will be EQUALLY inclined at an angle θ2 with the equal vectors or the resultant acts ALONG the angle bisector of both the equal vectors

Discussion

29.	Plz help me and post steps
Answer» I'm ALSO having DOUBT..

Discussion

30.	What do you mean by interaction of force
Answer» INTERACTION of FORCE MEANS PULL or Push a object, which changes its STATE of Motion..

Discussion

31.	Magnetic permeability of free space is
Answer» Ur ANS is 1.257 X 10 -6. I hope it helps u. if it helpful plz MARK as a brainlist

Discussion

32.	the places in a magnet where the resultant effective or repulsive force appear to be concentrated is called
Answer» HELLO, the answer is .................................... POLE. hope it helps... PLEASE MARK as BRAINLIST..!!

Discussion

33.	What is the 4th equation of motion
Answer» HOPE it HELP to you.

Discussion

34.	What is magnetic permeability?
Answer» It is the ratio of megnatic flux upon magnetic FIELD. it is DENOTED by MEU magnetic PERMEABILITY= B/H

Discussion

35.	Solve this pleasegive proper answer☺️
Answer» ANSWER: EXPLANATION: ATTACHMENT ATTACHED for REFERENCE.

35.

Solve this pleasegive proper answer☺️

Answer»

ANSWER:

EXPLANATION:

ATTACHMENT ATTACHED for REFERENCE.

Discussion

36.	What is the mass of electron
Answer» 9.1093835×10^-31 KG.

Discussion

37.	A magnetic substance can be magnetised to a maximum limit this limit is called
Answer» HEY MATE UR ANSWER is (MAGNETISATION)

Discussion

38.	I'LL MARK AS BRAINLIEST ...if t is the time required for a radioactive substance to reduce to one third of its initial amount then what amount will be left over after 0.5t ... Plz answer ... NO SPAMMING...
Answer» if t is the time required for a radioactive SUBSTANCE to REDUCE to ONE THIRD of its initial amount, $N_t=N_oe^{-t/ \tau}$ $\Rightarrow \frac{N_t}{N_o}= e^{-t/ \tau} \\ \\ \Rightarrow \frac{1}{3} = e^{-t/ \tau}$ If t' = 0.5t $N_{t'}=N_oe^{-t'/ \tau}$ $\Rightarrow \frac{N_{t'}}{N_o}= e^{-t'/ \tau} \\ \\ \Rightarrow \frac{N_{t'}}{N_o}= e^{-0.5t/ \tau}$ $\\ \\ \Rightarrow \frac{N_{t'}}{N_o}= e^{0.5} \times e^{-t/ \tau}$ $\\ \\ \Rightarrow \frac{N_{t'}}{N_o}= 1.6487 \times \frac{1}{3}$ $\\ \\ \Rightarrow \frac{N_{t'}}{N_o}= 0.5496 \approx 0.55 =\frac{11}{20}$ Thus, after 0.5t, 11/20 of the ORIGINAL amount will be left.

38.

I'LL MARK AS BRAINLIEST ...if t is the time required for a radioactive substance to reduce to one third of its initial amount then what amount will be left over after 0.5t ... Plz answer ... NO SPAMMING...

Answer»

if t is the time required for a radioactive SUBSTANCE to REDUCE to ONE THIRD of its initial amount,

$N_t=N_oe^{-t/ \tau}$

$\Rightarrow \frac{N_t}{N_o}= e^{-t/ \tau} \\ \\ \Rightarrow \frac{1}{3} = e^{-t/ \tau}$

If t' = 0.5t

$N_{t'}=N_oe^{-t'/ \tau}$

$\Rightarrow \frac{N_{t'}}{N_o}= e^{-t'/ \tau} \\ \\ \Rightarrow \frac{N_{t'}}{N_o}= e^{-0.5t/ \tau}$

$\\ \\ \Rightarrow \frac{N_{t'}}{N_o}= e^{0.5} \times e^{-t/ \tau}$

$\\ \\ \Rightarrow \frac{N_{t'}}{N_o}= 1.6487 \times \frac{1}{3}$

$\\ \\ \Rightarrow \frac{N_{t'}}{N_o}= 0.5496 \approx 0.55 =\frac{11}{20}$

Thus, after 0.5t, 11/20 of the ORIGINAL amount will be left.

Discussion

39.	Determine the value of ammeter with solution
Answer» The AMMETER READING is 1A

Discussion

40.	You are wearing a dress of mass 150g. How much force are you exerting on the dress?
Answer» 0.150×10=1.5newton ..........

Discussion

41.	A hammer of mass 400g.moving at 30ms-1 strikes a nail. I nail stops the hammer in a very short time of o.01s. What force of nail on the hammer
Answer» F= RATE of CHANGE of MOMENTUM = m(v-u)/t =0.4(30-0)/0.1 =120newton

Discussion

42.	Waht is a type of field forces
Answer» Two types of field :- ● Magnetic field : The field is completely consists of the magnetic FORCES of ATTRACTION between two points. ● ELECTRIC field : The field is completely consists of the ELECTROSTATIC forces of attraction between two points. Electrical ENERGY exists between those two points.

Discussion

43.	Application of spherical mirror in our daily life
Answer» As makeup Mirror as rear view mirror in vehicles.. reflectors in SEARCH lights, HEAD lights , solar cooker ... HOPE it helps !! ❤️

Discussion

44.	If momentum of an object is increased by 10% then its kinetic energy will increase by ??
Answer» ANSWER :- It will be INCREASED by 21%. Let the initial MASS of the body be m and its velocity be v. Initial momentum of the body = MV Initial KE = mv^2 /2 If the momentum increases by 10%, then NEW momentum = mv + 10% of mv. => mv + 10/100mv => mv + mv/10 =>11mv/10 =>m(11v/10) New velocity = 11v/10 Increase in velocity = v/10 New KE = m(11v/10)^2 /2 => 121/100mv^2/2 Therefore increase in KE = 21%.

Discussion

45.	What is the dot product of two vectors of magnitude of 3 and 5 if angle between them is 60 degree
Answer» DOT PRODUCT = 15 cos60° = 15/2

Discussion

46.	Scientist designed the shape of areoplane using the technique of reducing fluid friction by observing birds shape. How would you apperciate?
Answer» Adaptations for flight are many in a bird's body: these are called volant adaptations . Explanation: Bird's body is spindle shaped which provide less resistance while flying or during swimming as in case of penguins.Bird's volume of the body is increased by presence of feathers compared to the weight.Fore limbs are modified into wings for aerial locomotion.Reduction of weight is achieved by: loss of fingers; loss of SUTURES in skull , skull bones are thinner; absence of teeth , jaw bones form beak; tendency of fusion of vertebral bones to form synsacrum ; tail vestigial, represented by pygostyle that SUPPORTS tail feathers; external ear is represented by only tympanum; fibula of leg is vestigial . Bones are pneumatic (with air spaces).There are air sacs attached to lungs .Large flight muscles are attached to humerus at one end, and the other ends of these large muscles REMAIN attached to keel : latter is huge ventral projection on sternum. (Keel is much smaller/vestigial in flight less birds.)Gonads SQUEEZE in size after breeding season; in females only one side of reproductive system remain functional.Birds excrete uric acid, hence voluminous watery urine is not produced. Urinary bladder absent .Birds need more energy to sustain flight : their haemoglobin content is very HIGH, heart rate is high, digestive, circulatory and respiratory systems are very efficient; metabolic rate is also high, thus a higher body temperature is maintained. hope this proves to be useful........

Discussion

47.	Why does a moving ball come to rest autometicly
Answer» This happens because of the FRICTIONAL and GRAVITY.

Discussion

48.	two objects were placed in front of a concave mirror above the principal axis at different positions. it was observed that that one image is formed above pricipal axis and other one is below it identify the position of the object
Answer» For IMAGE above PRICIPLE axis object was PUT SOMEWHERE between pole and focus

Discussion

49.	Please help me solve problem no 4
Answer» ,HOPES it HELPS you

Discussion

50.	a motorboat with this engine on in a running river is blown over by a horizontal wind travels at 20 km per hour Sin inverse 0. 8 east of north .the velocity of the boat with its engine on in still water and blown over by a horizontal wind is 4 km per hour east and the velocity of boat with its engine on over the running river in the absence of wind is 8 km per hour South ...answer the following questions a)) actual velocity of engine in kilometre per hour is b)) the velocity of wind in kilometre per hour is c)) velocity of river in kilometre per hour is
Answer» 25 MATER RUNNING RIVER

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

a wooden block of mass 0.010 kg is dropped from the top of a cliff 100 m high. simultaneously A bullet of mass 0.010 kg is fired from the foot of a cliff upward with a velocity of 100 m per second. the bullet and the wooden block will meet each other after the time in seconds is?

a train starting from rest with the uniform acceleration of 0.2 meters per second for 5 minute calculate the speed and distance traveled with him

Solve it send me pic

The speed of the RAINDROP is 4 √2 m/s and the angle is 45°.

how will you give equal and opposite charge to two identical metal spheres on insulated stands? you can use a charged rod but touching of rod to sphere is not allowed.

if a body starts from rest and accelerate at a constant rate of 10m/s how much distance will it cover in 2sec

Hey !!!Please solve my doubt refer to the attachment ✔ Question no. 16 !!! ___________________

Examples of Newton's first law of motion

A person driving a car with 72km/h,suddenly sees a boy. if the distance moved by a car, before person applies the brakes is 5m,the reaction time of person is?

Examples for Newton's third law of motion

What will be the stopping distance if the initial velocity is doubled?

An object of mass m held against avertical wall by applying horizontalforce F as shown in the fi gure. Th eminimum value of the force F is

an object thrown vertically up from the ground passes the height 5 M twice in an interval of 10 second what is its time of flight

When a car takes a sudden left turn inthe curved road, passengers are pushedtowards the right due to

A car accelerates at a rate of 5 M per second square.find the increase its velocity in 2 seconds

What is the speed of light in water

what would be the force required to produce an acceleration of 2m/sec square in a body of mass 12 kg?what would be the acceleration if the force doubled

Solve these questions

Ghanatwa ka si matrak

Answer these two questions

What is the maximum speeds of sound?

Wayas to lft maximum weight in benchpress

Why the shapes of automobiles towards front ?

Velocity of car increases from 40m/s to 80m/s in 10s.find average speed

Why do we rub our hands together in winter

projectile motion from ground to ground.if maximum height is 30√3and horizontal range is 120mfind initial velicity and angle

a car is starting from rest accelerates at rate f through a distance s then continues at constant speed for time t and then decelerates at constant rate f/2 to come to rest if total distance is 15S then 1)s=ft (2) s=ft^2/6 (3)s=ft^2/48 (4)s=ft^2/72

Plz help me and post steps

What do you mean by interaction of force

Magnetic permeability of free space is

the places in a magnet where the resultant effective or repulsive force appear to be concentrated is called

What is the 4th equation of motion

What is magnetic permeability?

Solve this pleasegive proper answer☺️

What is the mass of electron

A magnetic substance can be magnetised to a maximum limit this limit is called

I'LL MARK AS BRAINLIEST ...if t is the time required for a radioactive substance to reduce to one third of its initial amount then what amount will be left over after 0.5t ... Plz answer ... NO SPAMMING...

Determine the value of ammeter with solution

You are wearing a dress of mass 150g. How much force are you exerting on the dress?

A hammer of mass 400g.moving at 30ms-1 strikes a nail. I nail stops the hammer in a very short time of o.01s. What force of nail on the hammer

Waht is a type of field forces

Application of spherical mirror in our daily life

If momentum of an object is increased by 10% then its kinetic energy will increase by ??

What is the dot product of two vectors of magnitude of 3 and 5 if angle between them is 60 degree

Scientist designed the shape of areoplane using the technique of reducing fluid friction by observing birds shape. How would you apperciate?

Why does a moving ball come to rest autometicly

two objects were placed in front of a concave mirror above the principal axis at different positions. it was observed that that one image is formed above pricipal axis and other one is below it identify the position of the object

Please help me solve problem no 4