13232 + Interview Questions in Physics Page 140 InterviewSolution

6951.	Which of the following statement is correct regarding magnets?
Answer» Which of the following statement is correct regarding magnets?

Discussion

6952.	What is current do it really exists why does it flow opposite to the flow of electron and also why from positive terminal to negative terminal does current really flow or is all thing done by electron
Answer» What is current do it really exists why does it flow opposite to the flow of electron and also why from positive terminal to negative terminal does current really flow or is all thing done by electron

Discussion

6953.	A top makes 16 rotations about its own axis within 0.4 seconds, its frequency is:
Answer» A top makes 16 rotations about its own axis within 0.4 seconds, its frequency is:

Discussion

6954.	A bullet of 10g strikes on a sand bag with speed of 1000m/s and stop after travelling 5cm inside the bag. Calculate :- a) The resistive force exerted by the sand on the bullet b) The time taken by the bullet to come to rest.
Answer» A bullet of 10g strikes on a sand bag with speed of 1000m/s and stop after travelling 5cm inside the bag. Calculate :- a) The resistive force exerted by the sand on the bullet b) The time taken by the bullet to come to rest.

Discussion

6955.	Mathematical expression for electric power(P), where I is current and R is resistance, is;
Answer» Mathematical expression for electric power(P), where $I$ is current and $R$ is resistance, is;

Discussion

6956.	A cavity of radius b is made in a disc of mass M, radius R, as shown in Figure. Find the new COM
Answer» A cavity of radius $b$ is made in a disc of mass $M$ , radius $R$ , as shown in Figure. Find the new COM

Discussion

6957.	29.A liquid having coefficient of viscosity 0.02 decapoise is filled in a container of cross section area 20m2.if viscous drag between two adjacent layer in flowing is 1 newton, the velocity gradient is
Answer» 29.A liquid having coefficient of viscosity 0.02 decapoise is filled in a container of cross section area 20m2.if viscous drag between two adjacent layer in flowing is 1 newton, the velocity gradient is

Discussion

6958.	The distance between two consecutive crests in a wave train produced in a string is 5 cm. If 2 complete waves pass through any point per second, the velocity of the wave is
Answer» The distance between two consecutive crests in a wave train produced in a string is 5 cm. If 2 complete waves pass through any point per second, the velocity of the wave is

Discussion

6959.	This question has statement I and Statement II. Of the four choices given after the statements, choose the one that best describes the two statements. Statement I A point particle of mass m moving with speed v collides with stationary point particle of mass M. If the maximum energy loss possible is given as f(12mv2), then f=(mM+m) Assertion and Reason
Answer» This question has statement I and Statement II. Of the four choices given after the statements, choose the one that best describes the two statements. Statement I A point particle of mass m moving with speed v collides with stationary point particle of mass M. If the maximum energy loss possible is given as $f (\frac{1}{2} m v^{2}), t h e n f = (\frac{m}{M} + m)$ Assertion and Reason

Discussion

6960.	Question 03.1Mention in the following case, whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer.Polished wooden table
Answer» Question 03.1 Mention in the following case, whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer. Polished wooden table

Discussion

6961.	Q 12/15 A body is falling under the effect of gravityalone in vacuum. Which of the following quantitieswill remain constant for the body?a)Kinetic energy b)Potential energy c)Total mechanical energy d)Total linear momentum why not linear momentu
Answer» Q 12/15 A body is falling under the effect of gravityalone in vacuum. Which of the following quantitieswill remain constant for the body?a)Kinetic energy b)Potential energy c)Total mechanical energy d)Total linear momentum why not linear momentu

Discussion

6962.	A battery of 20 cells is charged by 220V with a charging current of 15 A. Emf of each cell =2V, internal resistance =0.1 ohm Series resistance =?
Answer» A battery of 20 cells is charged by 220V with a charging current of 15 A. Emf of each cell =2V, internal resistance =0.1 ohm Series resistance =?

Discussion

6963.	Eleven 15 Ω and four 7 Ω resistors are connected in series. If a new resistance of 21 Ω is added in series, the change in the effective resistance would be:21
Answer» Eleven $15 Ω$ and four $7 Ω$ resistors are connected in series. If a new resistance of $21 Ω$ is added in series, the change in the effective resistance would be: 21

Discussion

6964.	Consider the situation where a gun is kept on a frictionless surface and is being operated remotely by a group of engineers. If the mass of the gun is more than that of the bullet, what would be the relation between their velocities?
Answer» Consider the situation where a gun is kept on a frictionless surface and is being operated remotely by a group of engineers. If the mass of the gun is more than that of the bullet, what would be the relation between their velocities?

Discussion

6965.	A jar is filled with two non-mixing liquids having densities ρ1 and ρ2 respectively. A solid ball, made of a material of density ρ3, is dropped in the jar. It attains equilibrium in the position as shown in the figure. Which of the following is true for ρ1,ρ2 and ρ3 ?
Answer» A jar is filled with two non-mixing liquids having densities $ρ_{1}$ and $ρ_{2}$ respectively. A solid ball, made of a material of density $ρ_{3}$ , is dropped in the jar. It attains equilibrium in the position as shown in the figure. Which of the following is true for $ρ_{1}, ρ_{2}$ and $ρ_{3}$ ?

Discussion

6966.	Muscular forces are called so because:
Answer» Muscular forces are called so because:

Discussion

6967.	A 10 kg body is moving with a constant acceleration of 4 m/s2. If the initial velocity of the body is 2 m/s, what is the change in momentum in 5 s ?
Answer» A 10 kg body is moving with a constant acceleration of $4 m / s^{2}$ . If the initial velocity of the body is 2 m/s, what is the change in momentum in 5 s ?

Discussion

6968.	A particle falls from earth (i)from infinity (ii)from aheight of 10times the radius of earth. the ratio of the velocities gained on reaching the earth's surface is:- (1)\sqrt{11}:\sqrt{10} (2)\sqrt{10}:\sqrt{11} (3)10:11 (4)11:10
Answer» A particle falls from earth (i)from infinity (ii)from aheight of 10times the radius of earth. the ratio of the velocities gained on reaching the earth's surface is:- (1)\sqrt{11}:\sqrt{10} (2)\sqrt{10}:\sqrt{11} (3)10:11 (4)11:10

Discussion

6969.	Arun & his friends were travelling in a car. The car suddenly stops due to engine failure. If Arun and his friends apply a force of 1000 N to drag the car to the nearest garage that is 1.2 km from that place in 20 minutes, determine the total power spent by them.
Answer» Arun & his friends were travelling in a car. The car suddenly stops due to engine failure. If Arun and his friends apply a force of 1000 N to drag the car to the nearest garage that is 1.2 km from that place in 20 minutes, determine the total power spent by them.

Discussion

6970.	Explain the principle of Van de Graaf Generator with the required expressions
Answer» Explain the principle of Van de Graaf Generator with the required expressions

Discussion

6971.	Question 6 Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of 10 ms−1. It implies that the boy is (a) at rest (b) moving with no acceleration (c) in accelerated motion (d) moving with uniform velocity
Answer» Question 6 Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of $10 m s^{- 1}$ . It implies that the boy is (a) at rest (b) moving with no acceleration (c) in accelerated motion (d) moving with uniform velocity

Discussion

6972.	In the given figure, if we immerse the block into the water then what will happen to the reading on the spring balance?
Answer» In the given figure, if we immerse the block into the water then what will happen to the reading on the spring balance?

6972.

In the given figure, if we immerse the block into the water then what will happen to the reading on the spring balance?

Answer»

In the given figure, if we immerse the block into the water then what will happen to the reading on the spring balance?

Discussion

6973.	A satellite is launched into circular orbit of radius R around earth while a second satellite is launched into an orbit of radius 1.02 find the percentage difference in the time periods of two saellites
Answer» A satellite is launched into circular orbit of radius R around earth while a second satellite is launched into an orbit of radius 1.02 find the percentage difference in the time periods of two saellites

Discussion

6974.	Draw a velocity-time graph to show the following motion : A car accelerates uniformly from rest for 5 s; then it travels at a steady velocity for 5 s.
Answer» Draw a velocity-time graph to show the following motion : A car accelerates uniformly from rest for 5 s; then it travels at a steady velocity for 5 s.

6974.

Draw a velocity-time graph to show the following motion : A car accelerates uniformly from rest for 5 s; then it travels at a steady velocity for 5 s.

Answer»

Draw a velocity-time graph to show the following motion :

A car accelerates uniformly from rest for 5 s; then it travels at a steady velocity for 5 s.

Discussion

6975.	A 50 kg crate is suspended between the ceiling and the floor using two spring balances, one attached to ceiling and other to the floor. Reading of lower scale is 120 N what is the reading of upper one n nt n nt ntt nttt ntttt ntt ntt nttt ntttt ntt nt n n nt
Answer» A 50 kg crate is suspended between the ceiling and the floor using two spring balances, one attached to ceiling and other to the floor. Reading of lower scale is 120 N what is the reading of upper one n nt n nt ntt nttt ntttt ntt ntt nttt ntttt ntt nt n n nt

Discussion

6976.	If initial velocity of a particle is î+2j and its acceleration is 2î+3j. Find its1. Rate of change of speed2. Rate of change of velocity
Answer» If initial velocity of a particle is î+2j and its acceleration is 2î+3j. Find its 1. Rate of change of speed 2. Rate of change of velocity

Discussion

6977.	Write any two exapmles of fossil fuels?
Answer» Write any two exapmles of fossil fuels?

Discussion

6978.	If a carpet is beaten with a stick, the dust comes out of it. Why does this happen?
Answer» If a carpet is beaten with a stick, the dust comes out of it. Why does this happen?

Discussion

6979.	a ball is thrown upward from a building of height 40 m at 4m/s. a ball from ground is thrown upward simultaneously at 24 m/s. find the time and position where they meet?
Answer» a ball is thrown upward from a building of height 40 m at 4m/s. a ball from ground is thrown upward simultaneously at 24 m/s. find the time and position where they meet?

Discussion

6980.	An object is moving along the principal axis of a concave mirror of focal length 8 cm. At a distance of 4 cm from the mirror, the image formed is twice the height of the object. Then, the magnification produced for object distance 20 cm will be
Answer» An object is moving along the principal axis of a concave mirror of focal length $8 cm$ . At a distance of $4 cm$ from the mirror, the image formed is twice the height of the object. Then, the magnification produced for object distance $20 cm$ will be

Discussion

6981.	what is newton's 2nd law
Answer» what is newton's 2nd law

Discussion

6982.	I am not clear about equation of motion
Answer» I am not clear about equation of motion

Discussion

6983.	Question 3Cite an experiment to show that sound needs a material medium for its propagation.
Answer» Question 3 Cite an experiment to show that sound needs a material medium for its propagation.

Discussion

6984.	Two bodies P and Q having masses in ratio 3:1 possess the same kinetic energy . The ratio of linear momentum of Q to P i
Answer» Two bodies P and Q having masses in ratio 3:1 possess the same kinetic energy . The ratio of linear momentum of Q to P i

Discussion

6985.	A mass M issuspended from a massless spring . An additional mass m stretches spring further by a dis†an ce x.The combined mass will oscillate with period-
Answer» A mass M issuspended from a massless spring . An additional mass m stretches spring further by a dis†an ce x.The combined mass will oscillate with period-

Discussion

6986.	A car travel with a constant velocity of 27km/h for 10 min and then decelerates for 10 min before coming to rest . Find the total distance traveled by the car.
Answer» A car travel with a constant velocity of 27km/h for 10 min and then decelerates for 10 min before coming to rest . Find the total distance traveled by the car.

Discussion

6987.	25. A ball is taken into liquid till 'h' depth find maximum height gained by ball in air(density of ball is smaller than density of liquid).
Answer» 25. A ball is taken into liquid till 'h' depth find maximum height gained by ball in air(density of ball is smaller than density of liquid).

Discussion

6988.	Pressure at a point inside a liquid is ___ to it's depth.
Answer» Pressure at a point inside a liquid is ___ to it's depth.

Discussion

6989.	Solve(1) Sound wave has frequency 320 Hz and wavelength 0.25 m. How much distance will it travel in 10 second.[Ans : 800 m.](2) A sound wave having certain frequency travels with a speed of 336 m/s and wavelength 3 cm. calculate the frequency. Will it be audible?[11200 Hz, Yes.]
Answer» Solve (1) Sound wave has frequency 320 Hz and wavelength 0.25 m. How much distance will it travel in 10 second. [Ans : 800 m.] (2) A sound wave having certain frequency travels with a speed of 336 m/s and wavelength 3 cm. calculate the frequency. Will it be audible? [11200 Hz, Yes.]

6989.

Solve(1) Sound wave has frequency 320 Hz and wavelength 0.25 m. How much distance will it travel in 10 second.[Ans : 800 m.](2) A sound wave having certain frequency travels with a speed of 336 m/s and wavelength 3 cm. calculate the frequency. Will it be audible?[11200 Hz, Yes.]

Answer»

Solve

(1) Sound wave has frequency 320 Hz and wavelength 0.25 m. How much distance will it travel in 10 second.

[Ans : 800 m.]

(2) A sound wave having certain frequency travels with a speed of 336 m/s and wavelength 3 cm. calculate the frequency. Will it be audible?

[11200 Hz, Yes.]

Discussion

6990.	If F1 is the magnitude of the force exerted on the Sun by Earth and F2 is the magnitude of the force exerted on Earth by the Sun, then :
Answer» If $F_{1}$ is the magnitude of the force exerted on the Sun by Earth and $F_{2}$ is the magnitude of the force exerted on Earth by the Sun, then :

Discussion

6991.	Two bodies A and B of mases m and 2m respectively are placed on a smooth floor. They are connected by a spring. A third body C of mass m moves with velocity v0 along the line joining A and B and collides elastically with A as shown in figure. At a certain instant of time t0 after collision, it is found that the instantaneous velocities of A and B are the same. Further at this instant the compression of the spring is found to be x0. Determine (a) the common velocity of A and B at time t0 and (b) the spring constant.
Answer» Two bodies A and B of mases m and 2m respectively are placed on a smooth floor. They are connected by a spring. A third body C of mass m moves with velocity $v_{0}$ along the line joining A and B and collides elastically with A as shown in figure. At a certain instant of time $t_{0}$ after collision, it is found that the instantaneous velocities of A and B are the same. Further at this instant the compression of the spring is found to be $x_{0}$ . Determine (a) the common velocity of A and B at time $t_{0}$ and (b) the spring constant.

6991.

Two bodies A and B of mases m and 2m respectively are placed on a smooth floor. They are connected by a spring. A third body C of mass m moves with velocity v0 along the line joining A and B and collides elastically with A as shown in figure. At a certain instant of time t0 after collision, it is found that the instantaneous velocities of A and B are the same. Further at this instant the compression of the spring is found to be x0. Determine (a) the common velocity of A and B at time t0 and (b) the spring constant.

Answer»

Two bodies A and B of mases m and 2m respectively are placed on a smooth floor. They are connected by a spring. A third body C of mass m moves with velocity $v_{0}$ along the line joining A and B and collides elastically with A as shown in figure. At a certain instant of time $t_{0}$ after collision, it is found that the instantaneous velocities of A and B are the same. Further at this instant the compression of the spring is found to be $x_{0}$ . Determine (a) the common velocity of A and B at time $t_{0}$ and (b) the spring constant.

Discussion

6992.	Question 2A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?
Answer» Question 2 A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?

Discussion

6993.	Power is equal to
Answer» Power is equal to

Discussion

6994.	Do Earth has nuclear reactions inside core?
Answer» Do Earth has nuclear reactions inside core?

Discussion

6995.	Calculate momentum of a toy car of mass 200 g moves with a speed of 5 m/s
Answer» Calculate momentum of a toy car of mass 200 g moves with a speed of 5 m/s

Discussion

6996.	Sir/Mam following is my question : Why does a boxer moves his head backward to minimize the effect of the coming punch ? Pls help me solve this question. Thnx
Answer» Sir/Mam following is my question : Why does a boxer moves his head backward to minimize the effect of the coming punch ? Pls help me solve this question. Thnx

6996.

Sir/Mam following is my question : Why does a boxer moves his head backward to minimize the effect of the coming punch ? Pls help me solve this question. Thnx

Answer»

Sir/Mam following is my question :

Why does a boxer moves his head backward to minimize the effect of the coming punch ?

Pls help me solve this question.

Thnx

Discussion

6997.	Which energy is used to produce sound when we clan our hands?
Answer» Which energy is used to produce sound when we clan our hands?

Discussion

6998.	Name the form of energy stored in a wound up spring of a watch.
Answer» Name the form of energy stored in a wound up spring of a watch.

Discussion

6999.	An immersion heater rated 1000W ,220V is used to heat 0.01m^3 of water . Assuming that the power is supplied at 220V and 60^°/^° of the power supplied is used to heat the water ,how long will it take to increase the temperature of the water from 15^0C to 40^0C ?
Answer» An immersion heater rated 1000W ,220V is used to heat 0.01m^3 of water . Assuming that the power is supplied at 220V and 60^°/^° of the power supplied is used to heat the water ,how long will it take to increase the temperature of the water from 15^0C to 40^0C ?

Discussion

7000.	If a balloon filled with air and its mouth unties, is released with its mouth in the downward direction, itmoves upwards. Why?
Answer» If a balloon filled with air and its mouth unties, is released with its mouth in the downward direction, it moves upwards. Why?

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following statement is correct regarding magnets?

What is current do it really exists why does it flow opposite to the flow of electron and also why from positive terminal to negative terminal does current really flow or is all thing done by electron

A top makes 16 rotations about its own axis within 0.4 seconds, its frequency is:

A bullet of 10g strikes on a sand bag with speed of 1000m/s and stop after travelling 5cm inside the bag. Calculate :- a) The resistive force exerted by the sand on the bullet b) The time taken by the bullet to come to rest.

Mathematical expression for electric power(P), where I is current and R is resistance, is;

A cavity of radius b is made in a disc of mass M, radius R, as shown in Figure. Find the new COM

29.A liquid having coefficient of viscosity 0.02 decapoise is filled in a container of cross section area 20m2.if viscous drag between two adjacent layer in flowing is 1 newton, the velocity gradient is

The distance between two consecutive crests in a wave train produced in a string is 5 cm. If 2 complete waves pass through any point per second, the velocity of the wave is

Question 03.1Mention in the following case, whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer.Polished wooden table

Q 12/15 A body is falling under the effect of gravityalone in vacuum. Which of the following quantitieswill remain constant for the body?a)Kinetic energy b)Potential energy c)Total mechanical energy d)Total linear momentum why not linear momentu

A battery of 20 cells is charged by 220V with a charging current of 15 A. Emf of each cell =2V, internal resistance =0.1 ohm Series resistance =?

Eleven 15 Ω and four 7 Ω resistors are connected in series. If a new resistance of 21 Ω is added in series, the change in the effective resistance would be:21

Consider the situation where a gun is kept on a frictionless surface and is being operated remotely by a group of engineers. If the mass of the gun is more than that of the bullet, what would be the relation between their velocities?

A jar is filled with two non-mixing liquids having densities ρ1 and ρ2 respectively. A solid ball, made of a material of density ρ3, is dropped in the jar. It attains equilibrium in the position as shown in the figure. Which of the following is true for ρ1,ρ2 and ρ3 ?

Muscular forces are called so because:

A 10 kg body is moving with a constant acceleration of 4 m/s2. If the initial velocity of the body is 2 m/s, what is the change in momentum in 5 s ?

A particle falls from earth (i)from infinity (ii)from aheight of 10times the radius of earth. the ratio of the velocities gained on reaching the earth's surface is:- (1)\sqrt{11}:\sqrt{10} (2)\sqrt{10}:\sqrt{11} (3)10:11 (4)11:10

Arun &amp; his friends were travelling in a car. The car suddenly stops due to engine failure. If Arun and his friends apply a force of 1000 N to drag the car to the nearest garage that is 1.2 km from that place in 20 minutes, determine the total power spent by them.

Explain the principle of Van de Graaf Generator with the required expressions

Question 6 Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of 10 ms−1. It implies that the boy is (a) at rest (b) moving with no acceleration (c) in accelerated motion (d) moving with uniform velocity

In the given figure, if we immerse the block into the water then what will happen to the reading on the spring balance?

A satellite is launched into circular orbit of radius R around earth while a second satellite is launched into an orbit of radius 1.02 find the percentage difference in the time periods of two saellites

Draw a velocity-time graph to show the following motion : A car accelerates uniformly from rest for 5 s; then it travels at a steady velocity for 5 s.

A 50 kg crate is suspended between the ceiling and the floor using two spring balances, one attached to ceiling and other to the floor. Reading of lower scale is 120 N what is the reading of upper one n nt n nt ntt nttt ntttt ntt ntt nttt ntttt ntt nt n n nt

If initial velocity of a particle is î+2j and its acceleration is 2î+3j. Find its1. Rate of change of speed2. Rate of change of velocity

Write any two exapmles of fossil fuels?

If a carpet is beaten with a stick, the dust comes out of it. Why does this happen?

a ball is thrown upward from a building of height 40 m at 4m/s. a ball from ground is thrown upward simultaneously at 24 m/s. find the time and position where they meet?

An object is moving along the principal axis of a concave mirror of focal length 8 cm. At a distance of 4 cm from the mirror, the image formed is twice the height of the object. Then, the magnification produced for object distance 20 cm will be

what is newton's 2nd law

I am not clear about equation of motion

Question 3Cite an experiment to show that sound needs a material medium for its propagation.

Two bodies P and Q having masses in ratio 3:1 possess the same kinetic energy . The ratio of linear momentum of Q to P i

A mass M issuspended from a massless spring . An additional mass m stretches spring further by a dis†an ce x.The combined mass will oscillate with period-

A car travel with a constant velocity of 27km/h for 10 min and then decelerates for 10 min before coming to rest . Find the total distance traveled by the car.

25. A ball is taken into liquid till 'h' depth find maximum height gained by ball in air(density of ball is smaller than density of liquid).

Pressure at a point inside a liquid is ___ to it's depth.

Solve(1) Sound wave has frequency 320 Hz and wavelength 0.25 m. How much distance will it travel in 10 second.[Ans : 800 m.](2) A sound wave having certain frequency travels with a speed of 336 m/s and wavelength 3 cm. calculate the frequency. Will it be audible?[11200 Hz, Yes.]

If F1 is the magnitude of the force exerted on the Sun by Earth and F2 is the magnitude of the force exerted on Earth by the Sun, then :

Question 2A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?

Power is equal to

Do Earth has nuclear reactions inside core?

Calculate momentum of a toy car of mass 200 g moves with a speed of 5 m/s

Sir/Mam following is my question : Why does a boxer moves his head backward to minimize the effect of the coming punch ? Pls help me solve this question. Thnx

Which energy is used to produce sound when we clan our hands?

Name the form of energy stored in a wound up spring of a watch.

An immersion heater rated 1000W ,220V is used to heat 0.01m^3 of water . Assuming that the power is supplied at 220V and 60^°/^° of the power supplied is used to heat the water ,how long will it take to increase the temperature of the water from 15^0C to 40^0C ?

If a balloon filled with air and its mouth unties, is released with its mouth in the downward direction, itmoves upwards. Why?

Arun & his friends were travelling in a car. The car suddenly stops due to engine failure. If Arun and his friends apply a force of 1000 N to drag the car to the nearest garage that is 1.2 km from that place in 20 minutes, determine the total power spent by them.