67486 + Interview Questions in Secondary School in Physics

1.	07. Centripetal acceleration is(a) a constant vector (b) a constant scala(c) a magnitude changing vector(d) not a constant vector
Answer» ANSWER: (B) a CONSTANT scalar Hope this answer helps you. Mark my answer as the Brainliest answer and follow me.

1.

07. Centripetal acceleration is(a) a constant vector (b) a constant scala(c) a magnitude changing vector(d) not a constant vector

Answer»

ANSWER:

(B) a CONSTANT scalar

Hope this answer helps you.

Mark my answer as the Brainliest answer and follow me.

Discussion

2.	પાંચ બાબતો જે ભારતને એક મહાન દેશ બનાવવા માટે કરીશ
Answer» ANSWER: લાંચ નહીં કહે. ગાંધીના સિધ્ધાંત &QUOT;બુરા માત દેખો" ને અનુસરો અન્યને ખોટું ન કરો અને જો કંઇક ખોટું થઈ રહ્યું છે તો કાં તો તેને અટકાવવાનો પ્રયાસ કરો અથવા તો બીજી રીતે જોશો. સ્વચ્છ ભારત, જાહેરમાં પેશાબ કરીને અને જાહેર સ્થળોએ થૂંકીને કચરાઓ ટાળીને તેને સ્વચ્છ દેશ બનાવો. તમારી ટેવો બદલો. દરેક એક શીખવે છે કારણ કે સાક્ષરતા ઘણા ગુનાઓ અને અંધશ્રદ્ધાઓનું મૂળ છે. ઓછામાં ઓછા એક એવા વિદ્યાર્થી માટે પ્રયત્ન કરો કે જે શાળા ફી ભરવા માટે અસમર્થ હોય. ભૂખ્યા લોકોને અને આશ્રયસ્થાનોમાં જે લોકોને ખોરાક ન મળતા હોય તેમને ખવડાવવાથી પણ આપણા દેશને મહાન બનાવવામાં મદદ મળી શકે છે. તેઓ નાગરિકો પણ છે, ફક્ત તેમની જરૂરિયાતો પૂરી કરવામાં સક્ષમ નથી. વધુ વૃક્ષો વાવો, તે પ્રદૂષણને નિયંત્રણમાં રાખવામાં મદદ કરે છે. અમે ભારતમાં બનાવેલા ઉત્પાદનો ખરીદીને ભારતીય ઉદ્યોગોને રિમોટ કરી શકીએ છીએ. આપણે બાળકીના તરફ નજર નાખવાને બદલે તેમનો આદર કરવો જોઈએ. જો તમને કોઈ પુત્રીનો જન્મ થાય છે તો તેણીને સમાન તકો આપો. Hope this answer HELPS you. Mark my answer as the BRAINLIEST answer and FOLLOW me.

2.

પાંચ બાબતો જે ભારતને એક મહાન દેશ બનાવવા માટે કરીશ

Answer»

ANSWER:

લાંચ નહીં કહે. ગાંધીના સિધ્ધાંત &QUOT;બુરા માત દેખો" ને અનુસરો અન્યને ખોટું ન કરો અને જો કંઇક ખોટું થઈ રહ્યું છે તો કાં તો તેને અટકાવવાનો પ્રયાસ કરો અથવા તો બીજી રીતે જોશો. સ્વચ્છ ભારત, જાહેરમાં પેશાબ કરીને અને જાહેર સ્થળોએ થૂંકીને કચરાઓ ટાળીને તેને સ્વચ્છ દેશ બનાવો. તમારી ટેવો બદલો. દરેક એક શીખવે છે કારણ કે સાક્ષરતા ઘણા ગુનાઓ અને અંધશ્રદ્ધાઓનું મૂળ છે. ઓછામાં ઓછા એક એવા વિદ્યાર્થી માટે પ્રયત્ન કરો કે જે શાળા ફી ભરવા માટે અસમર્થ હોય. ભૂખ્યા લોકોને અને આશ્રયસ્થાનોમાં જે લોકોને ખોરાક ન મળતા હોય તેમને ખવડાવવાથી પણ આપણા દેશને મહાન બનાવવામાં મદદ મળી શકે છે. તેઓ નાગરિકો પણ છે, ફક્ત તેમની જરૂરિયાતો પૂરી કરવામાં સક્ષમ નથી. વધુ વૃક્ષો વાવો, તે પ્રદૂષણને નિયંત્રણમાં રાખવામાં મદદ કરે છે. અમે ભારતમાં બનાવેલા ઉત્પાદનો ખરીદીને ભારતીય ઉદ્યોગોને રિમોટ કરી શકીએ છીએ. આપણે બાળકીના તરફ નજર નાખવાને બદલે તેમનો આદર કરવો જોઈએ. જો તમને કોઈ પુત્રીનો જન્મ થાય છે તો તેણીને સમાન તકો આપો.

Hope this answer HELPS you.

Mark my answer as the BRAINLIEST answer and FOLLOW me.

Discussion

3.	Certain force acting on a 20kg mass changes it's velocity from 5m)sec to 2m/sec. Calculate the work done by the force?
Answer» Answer: Hey mate here is ur answer MARK it as brainliest Explanation: here , GIVEN mass = 20 kg initial velocity (u) = 5 m/sec final velocity (v) = 2 m/sec time (t)= 1sec so , from first equation of motion v= u+ at or, a= ( v- u) / t a= ( 2 ms-¹ - 5 ms-¹) / 15 a= - 3 ms-² therefore, from third equation of motion v²- u²= 2as = ( 2ms -1 )² - ( 5ms-¹) ² = 2× (-3ms-²) ×5 = -21 m²s² = -6ms-²× 5 = s = 7/2 METRE =3.5 m therefore, we KNOW , workdone= f × s and , F = m× a so, work = m× a× s = 20 kg × ( -3ms-²) × 7/2m = - 210 joules.

3.

Certain force acting on a 20kg mass changes it's velocity from 5m)sec to 2m/sec. Calculate the work done by the force?

Answer»

Answer:

Hey mate here is ur answer MARK it as brainliest

Explanation:

here , GIVEN mass = 20 kg

initial velocity (u) = 5 m/sec

final velocity (v) = 2 m/sec

time (t)= 1sec

so , from first equation of motion

v= u+ at

or, a= ( v- u) / t

a= ( 2 ms-¹ - 5 ms-¹) / 15

a= - 3 ms-²

therefore, from third equation of motion

v²- u²= 2as

= ( 2ms -1 )² - ( 5ms-¹) ²

= 2× (-3ms-²) ×5

= -21 m²s² = -6ms-²× 5

= s = 7/2 METRE =3.5 m

therefore, we KNOW ,

workdone= f × s

and , F = m× a

so, work = m× a× s

= 20 kg × ( -3ms-²) × 7/2m

= - 210 joules.

Discussion

4.	Have you written the SI unit of torque in terms of moment of inertia and angular acceleration
Answer» ANSWER: Kelvin please MARK me as the BRAINLIEST and FOLLOW me

4.

Have you written the SI unit of torque in terms of moment of inertia and angular acceleration

Answer»

ANSWER:

Kelvin

please MARK me as the BRAINLIEST and FOLLOW me

Discussion

5.	Answer of addition reaction
Answer» Explanation: Answer. Monzur R. An ADDITION reaction is a reaction where two smaller MOLECULES REACT to form a bigger molecule with no other products

5.

Answer of addition reaction

Answer»

Explanation:

Answer. Monzur R. An ADDITION reaction is a reaction where two smaller MOLECULES REACT to form a bigger molecule with no other products

Discussion

6.	A pure inductor of 25 mh is connected to a 220 v and 50 hz frequncy fi d the inductive reactance and rms current of the circuit
Answer» The INDUCTIVE reactance of the CIRCUIT is equal to 2.5π ohm. The rms current flowing in the circuit is equal to 19.8 A. L = 25 mH f = frequency of AC = 50 Hz X(L) = inductive reactance of the circuit = L× 2πf = 25 × (10)^-3 × 50× 2π = 2.5π ohm RMS VOLTAGE of the circuit = peak voltage of the circuit / √2 = 220/√2 The RMS current of the circuit = RMS voltage / inductive reactance of the circuit => 220/(2.5π × √2) => 19.8 A

6.

A pure inductor of 25 mh is connected to a 220 v and 50 hz frequncy fi d the inductive reactance and rms current of the circuit

Answer»

The INDUCTIVE reactance of the CIRCUIT is equal to 2.5π ohm.

The rms current flowing in the circuit is equal to 19.8 A.

L = 25 mH

f = frequency of AC = 50 Hz

X(L) = inductive reactance of the circuit = L× 2πf

= 25 × (10)^-3 × 50× 2π

= 2.5π ohm

RMS VOLTAGE of the circuit = peak voltage of the circuit / √2

= 220/√2

The RMS current of the circuit = RMS voltage / inductive reactance of the circuit

=> 220/(2.5π × √2)

=> 19.8 A

Discussion

7.	Answer of oxidation
Answer» Answer: OXIDATION is the loss of electrons. EXPLANATION: PLEASE mark BRAINLIEST.

7.

Answer of oxidation

Answer»

Answer:

OXIDATION is the loss of electrons.

EXPLANATION:

PLEASE mark BRAINLIEST.

Discussion

8.	A beaker contains 50g of oil at 80 °C In that beaker a sphere of mass 20g is emrse. The final temperature of mixture becomes 60°C if the specific heat of oil is 0.6 cal/g°C and specific heat of sphere is 0.3 cal/g°C then find the initial temperature of sphere?
Answer» Explanation: 50gram f UX JOBS to it to KINDLY ok ki do if to have to bc up to it now GO ki am and do the HARD work

8.

A beaker contains 50g of oil at 80 °C In that beaker a sphere of mass 20g is emrse. The final temperature of mixture becomes 60°C if the specific heat of oil is 0.6 cal/g°C and specific heat of sphere is 0.3 cal/g°C then find the initial temperature of sphere?

Answer»

Explanation:

50gram f UX JOBS to it to KINDLY ok ki do if to have to bc up to it now GO ki am and do the HARD work

Discussion

9.	A hiker stands on the edge of a cliff 490 mabove the ground and throws a stonehorizontally with speed ground and throws of15 m s!. The time taken by the stone to reachthe ground is(a) 5 s (b) 10 s (c) 12 s (d) 15 s
Answer» $\huge\underline{\underline{\bf \orange{Question-}}}$ A hiker stands on the edge of a cliff 490m above the ground and throws a stone horizontally with SPEED ground and throws of 15 m/s. The time TAKEN by the stone to REACH the ground is $\huge\underline{\underline{\bf \orange{Solution-}}}$ $\large\underline{\underline{\sf Given:}}$ H = 490m v = 15m/s $\large\underline{\underline{\sf To\:Find:}}$ Time taken by stone to reach the ground (t) We KNOW that , ✪ $\large{\boxed{\bf \blue{t=\sqrt{\dfrac{2H}{g}}} }}$ $\implies{\sf t = \sqrt{\dfrac{2×490}{g}} }$ $\implies{\sf t = \sqrt{\dfrac{980}{9.8}} }$ $\implies{\sf t = \sqrt{100}}$ $\implies{\sf t = 10\:s }$ $\huge\underline{\underline{\bf \orange{Answer-}}}$ Option (b) 10s The time taken by the stone to reach the ground is ${\bf \red{10s}}$ .

9.

A hiker stands on the edge of a cliff 490 mabove the ground and throws a stonehorizontally with speed ground and throws of15 m s!. The time taken by the stone to reachthe ground is(a) 5 s (b) 10 s (c) 12 s (d) 15 s

Answer»

$\huge\underline{\underline{\bf \orange{Question-}}}$

A hiker stands on the edge of a cliff 490m above the ground and throws a stone horizontally with SPEED ground and throws of 15 m/s. The time TAKEN by the stone to REACH the ground is

$\huge\underline{\underline{\bf \orange{Solution-}}}$

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

H = 490m
v = 15m/s

$\large\underline{\underline{\sf To\:Find:}}$

Time taken by stone to reach the ground (t)

We KNOW that ,

✪ $\large{\boxed{\bf \blue{t=\sqrt{\dfrac{2H}{g}}} }}$

$\implies{\sf t = \sqrt{\dfrac{2×490}{g}} }$

$\implies{\sf t = \sqrt{\dfrac{980}{9.8}} }$

$\implies{\sf t = \sqrt{100}}$

$\implies{\sf t = 10\:s }$

$\huge\underline{\underline{\bf \orange{Answer-}}}$

Option (b) 10s

The time taken by the stone to reach

the ground is ${\bf \red{10s}}$ .

Discussion

10.	Distinguish between saturated hydrocarbon and unsaturated hydrocarbon
Answer» Answer: The DIFFERENCE between saturated andunsaturated hydrocarbons depends on the TYPES of bonds they CONTAIN. Saturated hydrocarbonscontain only single covalent bonds whereasunsaturated hydrocarbons contain at least ONE or more double or TRIPLE carbon-carbon bond.

10.

Distinguish between saturated hydrocarbon and unsaturated hydrocarbon

Answer»

Answer:

The DIFFERENCE between saturated andunsaturated hydrocarbons depends on the TYPES of bonds they CONTAIN. Saturated hydrocarbonscontain only single covalent bonds whereasunsaturated hydrocarbons contain at least ONE or more double or TRIPLE carbon-carbon bond.

Discussion

11.	How many images will be formed when the angle between two mirrors is 85 degree
Answer» ANSWER: 3 Explanations : No. Of IMAGES =360/n - 1 = 360°/85° - 1 = 4.2 - 1 =3.2 ~ 3

11.

How many images will be formed when the angle between two mirrors is 85 degree

Answer»

ANSWER: 3

Explanations :

No. Of IMAGES =360/n - 1

= 360°/85° - 1

= 4.2 - 1

=3.2 ~ 3

Discussion

12.	What is the main use of wires crossing in an electric circuit?
Answer» Answer: CONDUCT ELECTRICITY through them and ENABLE to use CIRCUIT

12.

What is the main use of wires crossing in an electric circuit?

Answer»

Answer:

CONDUCT ELECTRICITY through them and ENABLE to use CIRCUIT

Discussion

13.	Masses 8 kg, 4 kg and 41.(1.-3) are acted6N, 6iN andentre of mass of20. Three particles of masses 8 kgsituated at (4,1), (-2,2) and (1,-3)upon by external forces 67N14 N. The accelaration of centre ofthe system is1) 0.625 ms-23) 2.2 ms-22) 6.25 ms-24) 22 ms-2DOCTORS SERIES for Srl Chaltanya
Answer» Answer: zxvcbnmlkjhgfdsaqwertyuiop., 1237890465+*,.=/[email PROTECTED]'!?"$(:#)α\|[]\β®^~{}•`<©™...>&€π¤¥_%£¢√

13.

Masses 8 kg, 4 kg and 41.(1.-3) are acted6N, 6iN andentre of mass of20. Three particles of masses 8 kgsituated at (4,1), (-2,2) and (1,-3)upon by external forces 67N14 N. The accelaration of centre ofthe system is1) 0.625 ms-23) 2.2 ms-22) 6.25 ms-24) 22 ms-2DOCTORS SERIES for Srl Chaltanya

Answer»

Answer:

zxvcbnmlkjhgfdsaqwertyuiop., 1237890465+*,.=/[email PROTECTED]'!?"$(:#)α|[]\β®^~{}•`<©™...>&€π¤¥_%£¢√

Discussion

14.	Explain the word sacred !!!!
Answer» ANSWER: sacred means CONNECTED with god plzz MARK it as brainliest

14.

Explain the word sacred !!!!

Answer»

ANSWER:

sacred means CONNECTED with god

plzz MARK it as brainliest

Discussion

15.	Differentiate between nagara and Dravidian style of architecture !!!!
Answer» ANSWER: Dravidian style of temple architecture is usually PYRAMID in shape. ... The architecture basically consists of statues of kings, dancers, warriors, Gods etc. Nagara style of architecture is mostly Found in BEEHIVE shape. These Temples are mostly Found in Beehive shape. please FOLLOW me and Mark it as brainliest answer

15.

Differentiate between nagara and Dravidian style of architecture !!!!

Answer»

ANSWER:

Dravidian style of temple architecture is usually PYRAMID in shape. ... The architecture basically consists of statues of kings, dancers, warriors, Gods etc. Nagara style of architecture is mostly Found in BEEHIVE shape. These Temples are mostly Found in Beehive shape.

please FOLLOW me and Mark it as brainliest answer

Discussion

16.	Mathematical formula of Joule law of heating
Answer» EXPLANATION: H= $h = {i}^{2} rt$

16.

Mathematical formula of Joule law of heating

Answer»

EXPLANATION:

H=

$h = {i}^{2} rt$

Discussion

17.	If the radius of earth becomes half and its massremains unaltered then a day will be of-
Answer» ANSWER: will be of half Explanation: BECOZ of the FOLLOWING REASONS

17.

If the radius of earth becomes half and its massremains unaltered then a day will be of-

Answer»

ANSWER:

will be of half

Explanation:

BECOZ of the FOLLOWING REASONS

Discussion

18.	Derivation of three formula of motion
Answer» EXPLANATION: COMPLETE UR QUESTION PLEASE

18.

Derivation of three formula of motion

Answer»

EXPLANATION:

COMPLETE UR QUESTION PLEASE

Discussion

19.	Tha ray of light is incident normally in one surface of a prism of reftacting angle 60. The emergent ray grazes the other refracting surface. Find the refractive index of the prism.
Answer» $\huge\underline{\underline{\bf \orange{Question-}}}$ Tha RAY of light is incident normally in one surface of a prism of reftacting angle 60. The emergent ray grazes the other REFRACTING surface. Find the REFRACTIVE index of the prism. $\huge\underline{\underline{\bf \orange{Solution-}}}$ Tha ray of light is incident normally in one surface of a prism (Given) ⛬ ${\sf r_1}$ = 0 and Prism refracting angle (∠A) = 60° So , $\implies{\sf \red{ r_1+r_2=\angle A} }$ $\implies{\sf 0+ r_2=60°}$ $\implies{\sf \green{ r_2=60°} }$ ${\sf r_2}$ is critical angle for prism ✪ $\large{\boxed{\bf \blue{\mu=\dfrac{1}{sin\theta_c}} }}$ $\implies{\sf \mu=\dfrac{1}{sin\:r_2}}$ $\implies{\sf \mu=\dfrac{1}{sin60°} }$ $\implies{\sf \mu=\dfrac{1}{\sqrt{3}/2}}$ $\implies{\sf \mu=\dfrac{2}{\sqrt{3}} }$ On rationalisation $\implies{\sf \mu=\dfrac{2}{\sqrt{3}}×\dfrac{\sqrt{3}}{\sqrt{3}} }$ $\implies{\sf \mu=\dfrac{2\sqrt{3}}{3}}$ $\implies{\sf \mu=\dfrac{2×1.732}{3} }$ $\implies{\sf \mu= \dfrac{3.46}{3}}$ $\implies{\bf \red{ \mu=1.15 }}$ $\huge\underline{\underline{\bf \orange{Answer-}}}$ Refractive index of the prism is ${\bf \red{1.15}}$ .

19.

Tha ray of light is incident normally in one surface of a prism of reftacting angle 60. The emergent ray grazes the other refracting surface. Find the refractive index of the prism.

Answer»

$\huge\underline{\underline{\bf \orange{Question-}}}$

Tha RAY of light is incident normally in one surface of a prism of reftacting angle 60. The emergent ray grazes the other REFRACTING surface. Find the REFRACTIVE index of the prism.

$\huge\underline{\underline{\bf \orange{Solution-}}}$

Tha ray of light is incident normally in one surface of a prism (Given)

⛬ ${\sf r_1}$ = 0

and Prism refracting angle (∠A) = 60°

So ,

$\implies{\sf \red{ r_1+r_2=\angle A} }$

$\implies{\sf 0+ r_2=60°}$

$\implies{\sf \green{ r_2=60°} }$

${\sf r_2}$ is critical angle for prism

✪ $\large{\boxed{\bf \blue{\mu=\dfrac{1}{sin\theta_c}} }}$

$\implies{\sf \mu=\dfrac{1}{sin\:r_2}}$

$\implies{\sf \mu=\dfrac{1}{sin60°} }$

$\implies{\sf \mu=\dfrac{1}{\sqrt{3}/2}}$

$\implies{\sf \mu=\dfrac{2}{\sqrt{3}} }$

On rationalisation

$\implies{\sf \mu=\dfrac{2}{\sqrt{3}}×\dfrac{\sqrt{3}}{\sqrt{3}} }$

$\implies{\sf \mu=\dfrac{2\sqrt{3}}{3}}$

$\implies{\sf \mu=\dfrac{2×1.732}{3} }$

$\implies{\sf \mu= \dfrac{3.46}{3}}$

$\implies{\bf \red{ \mu=1.15 }}$

$\huge\underline{\underline{\bf \orange{Answer-}}}$

Refractive index of the prism is ${\bf \red{1.15}}$ .

Discussion

20.	A man can jump on moon six times as high as on earth why?
Answer» ANSWER: because GRAVITATIONAL FORCE of ATTRACTION is less than it is on the moon..

20.

A man can jump on moon six times as high as on earth why?

Answer»

ANSWER:

because GRAVITATIONAL FORCE of ATTRACTION is less than it is on the moon..

Discussion

21.	If m, p and L denote mass, linear momentum and angular momentum of a particle moving in circle of radius r, then its rotational K.E can be expressed as: (a)L^2/2m (b)L^2/2mr^2
Answer» Answer: B Explanation: K E =half MASS into velocity sq

21.

If m, p and L denote mass, linear momentum and angular momentum of a particle moving in circle of radius r, then its rotational K.E can be expressed as: (a)L^2/2m (b)L^2/2mr^2

Answer»

Answer:

B

Explanation:

K E =half MASS into velocity sq

Discussion

22.	Who were the marathas ????
Answer» Explanation: The Maratha Empire or the Maratha CONFEDERACY was a POWER that dominated a large PORTION of the INDIAN subcontinent in the 18TH century.

22.

Who were the marathas ????

Answer»

Explanation:

The Maratha Empire or the Maratha CONFEDERACY was a POWER that dominated a large PORTION of the INDIAN subcontinent in the 18TH century.

Discussion

23.	Answer it :)Why do a Capacitor Blocks DC current ??Have a Nice Day Ahead.....✌️
Answer» $HeYa ☺️$ ____________________________ $\huge{\fbox{\fbox{\mathfrak{\bigstar{\red{Answer}}}}}}$ ★ If a constant VOLTAGE (DC) is applied across a capacitor that is not charged, it CHARGES up to some value decided by the voltage and the capacitance (Q=CV). ★ A current will flow until the capacitor is FULLY charged, thus dq/dt exists during charging process. ★ That's why CAPACITORS are said to block DC. ____________________________ $(｡♥️‿♥️｡) MiSsDynaMiC$

23.

Answer it :)Why do a Capacitor Blocks DC current ??Have a Nice Day Ahead.....✌️

Answer»

$HeYa ☺️$

____________________________

$\huge{\fbox{\fbox{\mathfrak{\bigstar{\red{Answer}}}}}}$

★ If a constant VOLTAGE (DC) is applied across a capacitor that is not charged, it CHARGES up to some value decided by the voltage and the capacitance (Q=CV).

★ A current will flow until the capacitor is FULLY charged, thus dq/dt exists during charging process.

★ That's why CAPACITORS are said to block DC.

____________________________

$(｡♥️‿♥️｡) MiSsDynaMiC$

Discussion

24.	A cyclist moving on a circular track of radius40 m completes half a revolution in 40 s. Itsaverage velocity is(a) zero (b) 4 n ms (c)2 ms? (d) 8 T ms-
Answer» Given : => radius of circular track = 40m => time = 40 s To Find : => Average velocity after half revolution We know that : => Displacement after half revolution = 2r => Average velocity = d/t Calculation : => Vav = d/t = 2r/t = 2×40/40 = 2 m/s Answer : => Average velocity = 2 m/s

24.

A cyclist moving on a circular track of radius40 m completes half a revolution in 40 s. Itsaverage velocity is(a) zero (b) 4 n ms (c)2 ms? (d) 8 T ms-

Answer»

Given :

=> radius of circular track = 40m

=> time = 40 s

To Find :

=> Average velocity after half revolution

We know that :

=> Displacement after half revolution = 2r

=> Average velocity = d/t

Calculation :

=> Vav = d/t = 2r/t = 2×40/40 = 2 m/s

Answer :

=> Average velocity = 2 m/s

Discussion

25.	In isobaric process change in enthalphy equal to
Answer» Answer: atoms of DIFFERENT ELEMENTS with ATOMIC numbers, which have same MASS number, are called isobars

25.

In isobaric process change in enthalphy equal to

Answer»

Answer:

atoms of DIFFERENT ELEMENTS with ATOMIC numbers, which have same MASS number, are called isobars

Discussion

26.	A stone is thrown horizontally and follows the path XYZ shown. The direction of the acceleration of the stone at point Y is:
Answer» ANSWER: the acceleration is constant Explanation: the y middle PATH so it will not stop GOING on MOVING

26.

A stone is thrown horizontally and follows the path XYZ shown. The direction of the acceleration of the stone at point Y is:

Answer»

ANSWER:

the acceleration is constant

Explanation:

the y middle PATH so it will not stop GOING on MOVING

Discussion

27.	if m, p and L denote mass,linear momentum and angular momentum of a particle moving in circle of radius r,then its rotational K.E can be expressed as:
Answer» ANSWER: KINETIC ENERGY UNDERSTAND

27.

if m, p and L denote mass,linear momentum and angular momentum of a particle moving in circle of radius r,then its rotational K.E can be expressed as:

Answer»

ANSWER:

KINETIC ENERGY UNDERSTAND

Discussion

28.	What is haemoglobin ?
Answer» ANSWER: the PIGMENT in the blood which gives it RED colour please mark as BRAINLIEST

28.

What is haemoglobin ?

Answer»

ANSWER:

the PIGMENT in the blood which gives it RED colour

please mark as BRAINLIEST

Discussion

29.	A batsman hits back a ball straight in the direction of the bowler without changing it's initial speed of 12m/s. If the mass of the ball is 0.15kg, determine the impulse imparted to the ball
Answer» ANSWER:K=1/2mv² =1/20.1512² =1/20.15144 =72*0.15 ...CALCULATE that

29.

A batsman hits back a ball straight in the direction of the bowler without changing it's initial speed of 12m/s. If the mass of the ball is 0.15kg, determine the impulse imparted to the ball

Answer»

ANSWER:K=1/2mv²

=1/2*0.15*12²

=1/2*0.15*144

=72*0.15

...CALCULATE that

Discussion

30.	state two factors on which the magnitude buoyant force acting on a body immersed in a fluid depends
Answer» ANSWER: WATER .... please mark as BRAINLIEST answer and follow me

30.

state two factors on which the magnitude buoyant force acting on a body immersed in a fluid depends

Answer»

ANSWER:

WATER ....

please mark as BRAINLIEST answer and follow me

Discussion

31.	if m, p and L denote mass,linear momentum and angular momentum of a particle moving in circle of radius r,then its rotational K.E cen be expressed as:
Answer» The Expression for Rotational Kinetic ENERGY is: Kinetic energy is given by the expression $K.E = M * v^{2}/2$ where M is the mass and v is the VELOCITY of moving body. linear momentum is given as $p = M * v$ therefore by MULTIPLYING and DIVIDING by M, the kinetic energy expression becomes $K.E = p^{2} /(2 * M)$ Angular moment is given by $L = M * v * R$ $L = p * R\\p = L/R$ where R is the radius with which the particle moves. now substituting the above equation in the K.E expression ,we GET the rotational Kinetic energy expression: Ans: $K.E = L^{2} /(2R^{2} M)$

31.

if m, p and L denote mass,linear momentum and angular momentum of a particle moving in circle of radius r,then its rotational K.E cen be expressed as:

Answer»

The Expression for Rotational Kinetic ENERGY is:

Kinetic energy is given by the expression

$K.E = M * v^{2}/2$

where M is the mass and v is the VELOCITY of moving body.

linear momentum is given as

$p = M * v$

therefore by MULTIPLYING and DIVIDING by M, the kinetic energy expression becomes

$K.E = p^{2} /(2 * M)$

Angular moment is given by

$L = M * v * R$

$L = p * R\\p = L/R$

where R is the radius with which the particle moves.

now substituting the above equation in the K.E expression ,we GET the rotational Kinetic energy expression:

Ans: $K.E = L^{2} /(2R^{2} M)$

Discussion

32.	Two spheres of mass 10 g and 100 g each falls on the two pans of a table balance from a height of 40 cm and 10 cm, respectively. If both are brought to rest in 0.1 second, determine the force exerted by each sphere on the pans.
Answer» Given: Two spheres of MASS 10 g and 100 g each falls on the two pans of a table balance from a height of 40 CM and 10 cm, respectively. Both are brought to REST in 0.1 second. To find: Force EXERTED by each sphere on the pan. Calculation: For the 10 g pan: Velocity just before hitting the pan: $= > {v}^{2} = {u}^{2} + 2gh \\ = > {v}^{2} = 0 + (2 \times 10 \times 0.4) \\ = > {v}^{2} = 8 \\ = > v = 2 \sqrt{2} \: m {s}^{ - 1}$ Let force exerted be f: $f = mass \times acc.$ $= > f = \dfrac{10}{1000} \times \dfrac{0 - 2 \sqrt{2} }{0.1} \\ = > f = 0.1 \times ( - 2 \sqrt{2} ) \\ \boxed{ = > f = - 0.2 \sqrt{2} \: N }$ For the 100 g mass: Velocity just before hitting the pan: $= > {v}^{2} = {u}^{2} + 2gh \\ = > {v}^{2} = 0 + (2 \times 10 \times 0.1) \\ = > {v}^{2} = 2 \\ = > v = \sqrt{2} \: m {s}^{ - 1}$ Let force be f: $= > f = \dfrac{100}{1000} \times \dfrac{0 - \sqrt{2} }{0.1} \\ = > f = ( - \sqrt{2} ) \\ \boxed{= > f = - \sqrt{2} \: N }$

32.

Two spheres of mass 10 g and 100 g each falls on the two pans of a table balance from a height of 40 cm and 10 cm, respectively. If both are brought to rest in 0.1 second, determine the force exerted by each sphere on the pans.

Answer»

Given:

Two spheres of MASS 10 g and 100 g each falls on the two pans of a table balance from a height of 40 CM and 10 cm, respectively. Both are brought to REST in 0.1 second.

To find:

Force EXERTED by each sphere on the pan.

Calculation:

For the 10 g pan:

Velocity just before hitting the pan:

$= > {v}^{2} = {u}^{2} + 2gh \\ = > {v}^{2} = 0 + (2 \times 10 \times 0.4) \\ = > {v}^{2} = 8 \\ = > v = 2 \sqrt{2} \: m {s}^{ - 1}$

Let force exerted be f:

$f = mass \times acc.$

$= > f = \dfrac{10}{1000} \times \dfrac{0 - 2 \sqrt{2} }{0.1} \\ = > f = 0.1 \times ( - 2 \sqrt{2} ) \\ \boxed{ = > f = - 0.2 \sqrt{2} \: N }$

For the 100 g mass:

Velocity just before hitting the pan:

$= > {v}^{2} = {u}^{2} + 2gh \\ = > {v}^{2} = 0 + (2 \times 10 \times 0.1) \\ = > {v}^{2} = 2 \\ = > v = \sqrt{2} \: m {s}^{ - 1}$

Let force be f:

$= > f = \dfrac{100}{1000} \times \dfrac{0 - \sqrt{2} }{0.1} \\ = > f = ( - \sqrt{2} ) \\ \boxed{= > f = - \sqrt{2} \: N }$

Discussion

33.	Define and Derive the expression of terminal velocity.
Answer» ANSWER: Terminal VELOCITY is defined as the highestvelocity attained by an object that is falling through a fluid. It is OBSERVED when the sum of drag force and buoyancy is equal to the downward GRAVITY force that is acting on the object. The ACCELERATION of the object is zero as the net force acting on the object is zero.

33.

Define and Derive the expression of terminal velocity.

Answer»

ANSWER:

Terminal VELOCITY is defined as the highestvelocity attained by an object that is falling through a fluid. It is OBSERVED when the sum of drag force and buoyancy is equal to the downward GRAVITY force that is acting on the object. The ACCELERATION of the object is zero as the net force acting on the object is zero.

Discussion

34.	Can electromagnet can be used for separating plastic bags from a garbage heap?
Answer» ANSWER: no EXPLANATION: PLASTIC BAG are not MAGNETIC

34.

Can electromagnet can be used for separating plastic bags from a garbage heap?

Answer»

ANSWER:

no

EXPLANATION:

PLASTIC BAG are not MAGNETIC

Discussion

35.	Expriment to prove resistance depends on crossectional area of conductor
Answer» take two wires A B of same material and length A has Diameter 1mm B has Diameter 2mm pass CURRENT through both take ammeter and measure both A has lesser current than B hence we can say.... R is inversely proportional to cross sectional AREA

35.

Expriment to prove resistance depends on crossectional area of conductor

Answer»

take two wires A B of same material and length

A has Diameter 1mm

B has Diameter 2mm

pass CURRENT through both

take ammeter and measure both

A has lesser current than B

hence we can say....

R is inversely proportional to cross sectional AREA

Discussion

36.	The sun is visible to use about two minutes before the actual sunrise due to which phenomenon of light
Answer» ANSWER: It s DUE to the PHENOMENON of REFRACTION of light. Hope this HELPS

36.

The sun is visible to use about two minutes before the actual sunrise due to which phenomenon of light

Answer»

ANSWER:

It s DUE to the PHENOMENON of REFRACTION of light.

Hope this HELPS

Discussion

37.	Define capillarity. A capillary tube of radius r is dipped in a liquid of surface tension S. if the angle of contact for given solid liquid surface is acute, derive an expression for the height, to which the liquid will rise in capillary.
Answer» EXPLANATION: Capillary ACTION is the movement of a liquid through or along ANOTHER material against an opposing force, such as gravity. ... Examples of capillary action in water include water moving up a straw or GLASS TUBE, moving through a paper or cloth towel, moving through a plant, and tears moving through tear ducts.

37.

Define capillarity. A capillary tube of radius r is dipped in a liquid of surface tension S. if the angle of contact for given solid liquid surface is acute, derive an expression for the height, to which the liquid will rise in capillary.

Answer»

EXPLANATION:

Capillary ACTION is the movement of a liquid through or along ANOTHER material against an opposing force, such as gravity. ... Examples of capillary action in water include water moving up a straw or GLASS TUBE, moving through a paper or cloth towel, moving through a plant, and tears moving through tear ducts.

Discussion

38.	Wave of 99cm and 100cm both travelling with velocity396Calculate no.of beats produced by them
Answer» ANSWER: HOPE IT HELPS...

38.

Wave of 99cm and 100cm both travelling with velocity396Calculate no.of beats produced by them

Answer»

ANSWER:

HOPE IT HELPS...

Discussion

39.	A 30 kg fly wheel is moving with uniform angular acceleration. if radius of fly wheel is 2m then its moment of inertia:
Answer» Given , mass = 30 kg radius = 2 m We know that , the MOMENT of inertia is given by I = mr² Substitute the known values , we GET I = 30 × (2)² I = 30 × 4 I = 120 kg•m² Hence , the moment of inertia is 120 kg•m²

39.

A 30 kg fly wheel is moving with uniform angular acceleration. if radius of fly wheel is 2m then its moment of inertia:

Answer»

Given ,

mass = 30 kg

radius = 2 m

We know that , the MOMENT of inertia is given by

I = mr²

Substitute the known values , we GET

I = 30 × (2)²

I = 30 × 4

I = 120 kg•m²

Hence , the moment of inertia is 120 kg•m²

Discussion

40.	Why speed of msg are faster than the calls
Answer» ANSWER: MSG are not FASTER than the calls mark as BRAINLIEST

40.

Why speed of msg are faster than the calls

Answer»

ANSWER:

MSG are not FASTER than the calls

mark as BRAINLIEST

Discussion

41.	Introduction of concave mirror
Answer» Answer: the MIRROR which is used for in various purpose LIKE shaving ,used in FIELD of DENTIST

41.

Introduction of concave mirror

Answer»

Answer:

the MIRROR which is used for in various purpose LIKE shaving ,used in FIELD of DENTIST

Discussion

42.	A positevely charged rod is held near the cap of an electroscope a.) Explain why the leaves diverge moreb. What is the nature of the charge of the electroscope
Answer» Answer: the LEAVES diverge more because like charges repel each other as the GOLD LEAF ELECTROSCOPE is positively charged

42.

A positevely charged rod is held near the cap of an electroscope a.) Explain why the leaves diverge moreb. What is the nature of the charge of the electroscope

Answer»

Answer:

the LEAVES diverge more because like charges repel each other as the GOLD LEAF ELECTROSCOPE is positively charged

Discussion

43.	Describe the condition necessary for the cyclones to occur and the destruction cause by it
Answer» Explanation: Formation of cyclone is indicated by cyclonic circulation. Warmer air Rises up and cold air falls down creating a spiral. It is a giant engine of spiral winds which is FUELLED by WARM air. It can use ocean water to FIRE up its speed and create HAVOC in its pathaway.

43.

Describe the condition necessary for the cyclones to occur and the destruction cause by it

Answer»

Explanation:

Formation of cyclone is indicated by cyclonic circulation. Warmer air Rises up and cold air falls down creating a spiral. It is a giant engine of spiral winds which is FUELLED by WARM air. It can use ocean water to FIRE up its speed and create HAVOC in its pathaway.

Discussion

44.	what force is required to stretch a steel wire of 1 cm^2 cross section to double its length? Young's modulus of steel is 2×10^11Nm^-2
Answer» ANSWER: Correct option: (A) 2 × 106 N Explanation: Y = {F / (A / strain)} hence F = Y × A × strain ∴ F = 2 × 1011 × 1 × 10–4 × strain F = 2 × 107 × strain (1) GIVEN 1.1 L1 = L2 (Δℓ / ℓ) = {(L2 – L1) / L1} = {(1.1 L1 – L1) / L1} = 0.1 (Δℓ / ℓ) = strain = 0.1 from (1), F = 2 × 107 × 0.1 F = 2 × 106 N

44.

what force is required to stretch a steel wire of 1 cm^2 cross section to double its length? Young's modulus of steel is 2×10^11Nm^-2

Answer»

ANSWER:

Correct option: (A) 2 × 106 N Explanation: Y = {F / (A / strain)} hence F = Y × A × strain ∴ F = 2 × 1011 × 1 × 10–4 × strain F = 2 × 107 × strain (1) GIVEN 1.1 L1 = L2 (Δℓ / ℓ) = {(L2 – L1) / L1} = {(1.1 L1 – L1) / L1} = 0.1 (Δℓ / ℓ) = strain = 0.1 from (1), F = 2 × 107 × 0.1 F = 2 × 106 N

Discussion

45.	3. A wheel starts from rest and rotates through 360 radians in 4.0 s under theaction of a constant torque. If the rotational inertia of the wheel is 10kgm?,what is the torque acting on the wheel?mm
Answer» Torque actiNg on a wheel = 225 N*m

Discussion

46.	if there are three person Standing On Burj Khalifa, Mount Everest, and one on satellite who will get the best network connection and why ??
Answer» ANSWER: the PERSON standing on the satellite will get the best NETWORK CONNECTION Explanation: It is so BCOZ the signals are send from the satellite so he or she will get the best connection

46.

if there are three person Standing On Burj Khalifa, Mount Everest, and one on satellite who will get the best network connection and why ??

Answer»

ANSWER: the PERSON standing on the satellite will get the best NETWORK CONNECTION

Explanation: It is so BCOZ the signals are send from the satellite so he or she will get the best connection

Discussion

47.	Explain working-principle of electric ganarator and electric motor.
Answer» ANSWER: motor PRINCIPLE Explanation: A. conductor which can MOVE freely and which is kept in a magnetic field EXPERIENCE a force when current passes through it

47.

Explain working-principle of electric ganarator and electric motor.

Answer»

ANSWER:

motor PRINCIPLE

Explanation:

A. conductor which can MOVE freely and which is kept in a magnetic field EXPERIENCE a force when current passes through it

Discussion

48.	What is ocean thermal energy
Answer» ANSWER: The ENERGY which produce from ocean , SEA, river etc is CALLED thermal energy

48.

What is ocean thermal energy

Answer»

ANSWER:

The ENERGY which produce from ocean , SEA, river etc is CALLED thermal energy

Discussion

49.	What mass of carbon dioxide will have same number of molecules on 3.6g of water
Answer» EXPLANATION: MASS of SOLUTION =36g mass of SOLVENT=100g mass of solution=mass of solvent mass of solvent 36+100 concerned mass of solute×100massof solution 36/130×100=26.47%

49.

What mass of carbon dioxide will have same number of molecules on 3.6g of water

Answer»

EXPLANATION:

MASS of SOLUTION =36g

mass of SOLVENT=100g

mass of solution=mass of solvent

mass of solvent 36+100

concerned mass of solute×100massof solution

36/130×100=26.47%

Discussion

50.	Explain the origin of charges using atomic structure
Answer» Answer: An atom is present at the most basic level in everything we SEE around us. In fact, every living ORGANISM is composed of ATOMS. Every non-living thing around you such as tables, chairs, water, etc is made up of matter. But the building BLOCKS of matter are atoms. THEREFORE, living or non-living, everything is composed of atoms. Let us take a look at the structure of atom.

50.

Explain the origin of charges using atomic structure

Answer»

Answer:

An atom is present at the most basic level in everything we SEE around us. In fact, every living ORGANISM is composed of ATOMS. Every non-living thing around you such as tables, chairs, water, etc is made up of matter. But the building BLOCKS of matter are atoms. THEREFORE, living or non-living, everything is composed of atoms. Let us take a look at the structure of atom.

Discussion

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____________________________

____________________________

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Ans:

Two spheres of mass 10 g and 100 g each falls on the two pans of a table balance from a height of 40 cm and 10 cm, respectively. If both are brought to rest in 0.1 second, determine the force exerted by each sphere on the pans.​

Given:

To find:

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For the 100 g mass:

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state two factors on which the magnitude buoyant force acting on a body immersed in a fluid depends

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