13232 + Interview Questions in Physics Page 258 InterviewSolution

12851.	A small ball carries a charge equal to 'e' Coulomb, where 'e' is the charge on an electron. 20 such balls are put in a cylindrical box and sealed. The total charge in the box will be ___ coulombs.
Answer» A small ball carries a charge equal to 'e' Coulomb, where 'e' is the charge on an electron. $20$ such balls are put in a cylindrical box and sealed. The total charge in the box will be ___ coulombs.

Discussion

12852.	If the distance between the Earth and the Sun were half its present value, the approximate number of days in a year on the Earth would have been:
Answer» If the distance between the Earth and the Sun were half its present value, the approximate number of days in a year on the Earth would have been:

Discussion

12853.	What is the work done by the force of gravity when a stone of mass is 250 g is thrown up through a height of 2.5 m?
Answer» What is the work done by the force of gravity when a stone of mass is 250 g is thrown up through a height of 2.5 m?

Discussion

12854.	A car travels from stop A to stop B with a speed of 30 km/h and then returns back to A with a speed of 50 km/h. Find :(a) displacement of the car (b) The average speed of the carA(c) Total distance traveled
Answer» A car travels from stop A to stop B with a speed of 30 km/h and then returns back to A with a speed of 50 km/h. Find : (a) displacement of the car (b) The average speed of the carA (c) Total distance traveled

12854.

A car travels from stop A to stop B with a speed of 30 km/h and then returns back to A with a speed of 50 km/h. Find :(a) displacement of the car (b) The average speed of the carA(c) Total distance traveled

Answer»

A car travels from stop A to stop B with a speed of 30 km/h and then returns back to A with a speed of 50 km/h. Find :

(a) displacement of the car

(b) The average speed of the carA

(c) Total distance traveled

Discussion

12855.	Q73) Global satellite called GlobalSat for DRR was in news. Identify the correct statement related to it. 1) The satellite to be used for earth observation and disaster risk reduction will be renamed as UN Kalam GlobalSat 2) The renaming of GlobalSat after Kalam will be a tribute to his vision, who in his World Space Vision-2050 had envisaged space faring nations joining hands to find solutions to mankind’s major problems such as natural disasters, energy and water scarcity, health-care education issues and weather prediction 3) The proposal for GlobalSat was mooted by CANEUS in cooperation with UN agencies Code:
Answer» Q73) Global satellite called GlobalSat for DRR was in news. Identify the correct statement related to it. 1) The satellite to be used for earth observation and disaster risk reduction will be renamed as UN Kalam GlobalSat 2) The renaming of GlobalSat after Kalam will be a tribute to his vision, who in his World Space Vision-2050 had envisaged space faring nations joining hands to find solutions to mankind’s major problems such as natural disasters, energy and water scarcity, health-care education issues and weather prediction 3) The proposal for GlobalSat was mooted by CANEUS in cooperation with UN agencies Code:

12855.

Q73) Global satellite called GlobalSat for DRR was in news. Identify the correct statement related to it. 1) The satellite to be used for earth observation and disaster risk reduction will be renamed as UN Kalam GlobalSat 2) The renaming of GlobalSat after Kalam will be a tribute to his vision, who in his World Space Vision-2050 had envisaged space faring nations joining hands to find solutions to mankind’s major problems such as natural disasters, energy and water scarcity, health-care education issues and weather prediction 3) The proposal for GlobalSat was mooted by CANEUS in cooperation with UN agencies Code:

Answer»

Q73) Global satellite called GlobalSat for DRR was in news. Identify the correct statement related to it.

1) The satellite to be used for earth observation and disaster risk reduction will be renamed as UN Kalam GlobalSat

2) The renaming of GlobalSat after Kalam will be a tribute to his vision, who in his World Space Vision-2050 had envisaged space faring nations joining hands to find solutions to mankind’s major problems such as natural disasters, energy and water scarcity, health-care education issues and weather prediction

3) The proposal for GlobalSat was mooted by CANEUS in cooperation with UN agencies

Code:

Discussion

12856.	What will be the daughter nuclei after 4 alpha decays of 231 91Pa
Answer» What will be the daughter nuclei after 4 alpha decays of $_{91}^{231} P a$

Discussion

12857.	Question 12 Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
Answer» Question 12 Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.

Discussion

12858.	What would be the relation between velocity of the gun and bullet, if the mass of gun is less than the mass of bullet?
Answer» What would be the relation between velocity of the gun and bullet, if the mass of gun is less than the mass of bullet?

Discussion

12859.	A rubber ball floats on water with its 13rd volume outside water. What is the density of rubber ?
Answer» A rubber ball floats on water with its $\frac{1}{3} r d$ volume outside water. What is the density of rubber ?

Discussion

12860.	Sound waves are longitudinal waves and consists of compression and rarefaction. A siren has 16 holes and is making 960 revolutions per minute. The frequency of the sound produced by the siren is:
Answer» Sound waves are longitudinal waves and consists of compression and rarefaction. A siren has 16 holes and is making 960 revolutions per minute. The frequency of the sound produced by the siren is:

12860.

Sound waves are longitudinal waves and consists of compression and rarefaction. A siren has 16 holes and is making 960 revolutions per minute. The frequency of the sound produced by the siren is:

Answer»

Sound waves are longitudinal waves and consists of compression and rarefaction.

A siren has 16 holes and is making 960 revolutions per minute. The frequency of the sound produced by the siren is:

Discussion

12861.	Question 1 (a) Which of the following has more inertia: (a) a rubber ball and a stone of the same size?
Answer» Question 1 (a) Which of the following has more inertia: (a) a rubber ball and a stone of the same size?

Discussion

12862.	A bullet is fired vertically with an initial velocity of 19.6 m/s. (a) How high will it reach? (b) What is the time taken to reach that height?
Answer» A bullet is fired vertically with an initial velocity of 19.6 m/s. (a) How high will it reach? (b) What is the time taken to reach that height?

12862.

A bullet is fired vertically with an initial velocity of 19.6 m/s. (a) How high will it reach? (b) What is the time taken to reach that height?

Answer»

A bullet is fired vertically with an initial velocity of 19.6 m/s.

(a) How high will it reach?

(b) What is the time taken to reach that height?

Discussion

12863.	An appliance has three wires of colours red, black and green, and is connected to a three pin plug. The thickest pin is connected to which wire?
Answer» An appliance has three wires of colours red, black and green, and is connected to a three pin plug. The thickest pin is connected to which wire?

Discussion

12864.	A block of mass 'M' is placed on the top of a bigger inclined plane of mass '10M' as shown in figure. All the surfaces are frictionless. The system is released from rest. Find the distance moved by the bigger block at the instant the smaller block reaches the ground.
Answer» A block of mass 'M' is placed on the top of a bigger inclined plane of mass '10M' as shown in figure. All the surfaces are frictionless. The system is released from rest. Find the distance moved by the bigger block at the instant the smaller block reaches the ground.

Discussion

12865.	Current has both magnitude and direction. Then why is it considered scalar and not vector ? [3 MARKS]
Answer» Current has both magnitude and direction. Then why is it considered scalar and not vector ? [3 MARKS]

Discussion

12866.	Conservation of Mechanical Energy
Answer» Conservation of Mechanical Energy

Discussion

12867.	When an object is thrown in vertically upward direction, why the final velocity is 0
Answer» When an object is thrown in vertically upward direction, why the final velocity is 0

Discussion

12868.	If the frequency of a wave is 360 Hz and the distance between two nearest compression & rarefaction is 1 m. Then the velocity of wave is
Answer» If the frequency of a wave is 360 Hz and the distance between two nearest compression & rarefaction is 1 m. Then the velocity of wave is

Discussion

12869.	Look at the following table below. Classinterval Classmark 0−5A5−10B10−1512.515−2017.5 The value of A & B respectively are:
Answer» Look at the following table below. $\begin{matrix} C l a s s i n t e r v a l & C l a s s m a r k 0 - 5 & A 5 - 10 & B 10 - 15 & 12.5 15 - 20 & 17.5 \end{matrix}$ The value of A & B respectively are:

12869.

Look at the following table below. Classinterval Classmark 0−5A5−10B10−1512.515−2017.5 The value of A & B respectively are:

Answer»

Look at the following table below.

$\begin{matrix} C l a s s i n t e r v a l & C l a s s m a r k 0 - 5 & A 5 - 10 & B 10 - 15 & 12.5 15 - 20 & 17.5 \end{matrix}$

The value of A & B respectively are:

Discussion

12870.	The rear side of a truck is open and a box of 40 kg mass is placed 5 m away from the open end as shown in Fig. 5.22. The coefficient of friction between the box and the surface below it is 0.15. On a straight road, the truck starts from rest and accelerates with 2ms−2. At what distance from the starting point does the box fall off the truck? (Ignore the size of the box).
Answer» The rear side of a truck is open and a box of 40 kg mass is placed 5 m away from the open end as shown in Fig. 5.22. The coefficient of friction between the box and the surface below it is 0.15. On a straight road, the truck starts from rest and accelerates with $2 m s^{- 2}$ . At what distance from the starting point does the box fall off the truck? (Ignore the size of the box).

Discussion

12871.	What do you mean by free fall? [2 MARKS]
Answer» What do you mean by free fall? [2 MARKS]

Discussion

12872.	Inside a physics lab: (vibrating tuning fork does SHM) Teacher: this experiment is about finding the frequency of oscillation of different tuning forks. You hit it against something and take it close to this device [pointing at the device] which measures the frequency. The oscillation of a tuning fork is simple harmonic. Student X hits a thick tuning fork lightly and finds out its frequency as f. student x then hits a thin one lightly and finds its frequency to be f'. student x thinks if he hit the thick one hard enough its frequency might come out to be f'. The student tries this.
Answer» Inside a physics lab: (vibrating tuning fork does SHM) Teacher: this experiment is about finding the frequency of oscillation of different tuning forks. You hit it against something and take it close to this device [pointing at the device] which measures the frequency. The oscillation of a tuning fork is simple harmonic. Student X hits a thick tuning fork lightly and finds out its frequency as f. student x then hits a thin one lightly and finds its frequency to be f'. student x thinks if he hit the thick one hard enough its frequency might come out to be f'. The student tries this.

12872.

Inside a physics lab: (vibrating tuning fork does SHM) Teacher: this experiment is about finding the frequency of oscillation of different tuning forks. You hit it against something and take it close to this device [pointing at the device] which measures the frequency. The oscillation of a tuning fork is simple harmonic. Student X hits a thick tuning fork lightly and finds out its frequency as f. student x then hits a thin one lightly and finds its frequency to be f'. student x thinks if he hit the thick one hard enough its frequency might come out to be f'. The student tries this.

Answer»

Inside a physics lab: (vibrating tuning fork does SHM)

Teacher: this experiment is about finding the frequency of oscillation of different tuning forks.

You hit it against something and take it close to this device [pointing at the device] which measures the frequency. The oscillation of a tuning fork is simple harmonic.

Student X hits a thick tuning fork lightly and finds out its frequency as f. student x then hits a thin one lightly and finds its frequency to be f'. student x thinks if he hit the thick one hard enough its frequency might come out to be f'. The student tries this.

Discussion

12873.	A man running with a uniform speed ‘u’ on a straight road observes a stationary bus at a distance ‘d’ a head of him. At that instant, the bus starts with an acceleration ‘a’. The condition that he would be able to catch the bus is
Answer» A man running with a uniform speed ‘u’ on a straight road observes a stationary bus at a distance ‘d’ a head of him. At that instant, the bus starts with an acceleration ‘a’. The condition that he would be able to catch the bus is

Discussion

12874.	Generally we observe that when a bus suddenly takes a turn, the passengers are thrown outwards because of
Answer» Generally we observe that when a bus suddenly takes a turn, the passengers are thrown outwards because of

Discussion

12875.	Which of the following mirrors always form a virtual and diminished image irrespective of the object location?
Answer» Which of the following mirrors always form a virtual and diminished image irrespective of the object location?

Discussion

12876.	An auto travels with a uniform speed u for the first half duration and the next half duration with a uniform speed v. Find its average speed.
Answer» An auto travels with a uniform speed u for the first half duration and the next half duration with a uniform speed v. Find its average speed.

Discussion

12877.	F = K×m×(V−U)t; where K is a constant can be rewritten as:
Answer» F = $K \times m \times \frac{(V - U)}{t}$ ; where K is a constant can be rewritten as:

Discussion

12878.	A man weighs 600N on the equator, but when he moves to the pole he finds a slight increase in his weight. This is because
Answer» A man weighs 600N on the equator, but when he moves to the pole he finds a slight increase in his weight. This is because

Discussion

12879.	On the top of a certain mountain where atmospheric pressure is 535 mm Hg, pure water shows a boiling point of 360 K and it takes 3×102 min to boil at the top of the mountain as against 3 min taken to boil an egg at 370 K. The ratio of rate constants K370K360 is ?
Answer» On the top of a certain mountain where atmospheric pressure is 535 mm Hg, pure water shows a boiling point of 360 K and it takes $3 \times 10^{2}$ min to boil at the top of the mountain as against 3 min taken to boil an egg at 370 K. The ratio of rate constants $\frac{K_{370}}{K_{360}}$ is ?

Discussion

12880.	Q1: if 4s velocity of a body of mass 50kg increases from 2m/s to 10m/s calculate force?
Answer» Q1: if 4s velocity of a body of mass 50kg increases from 2m/s to 10m/s calculate force?

Discussion

12881.	A body, when acted upon by a force of 10 kgf, gets displaced by 0.5 m. Calculate the work done by the force, when the displacement is (i) in the direction of force, (ii) at an angle of 60o with the force, and (iii) normal to the force.(g=10 N kg−1).
Answer» A body, when acted upon by a force of 10 kgf, gets displaced by 0.5 m. Calculate the work done by the force, when the displacement is (i) in the direction of force, (ii) at an angle of $60^{o}$ with the force, and (iii) normal to the force.(g=10 N $k g^{- 1}$ ).

Discussion

12882.	Question 16 An object of mass, m is moving with a constant velocity, v. how much work should be done on the object in order to bring the object to rest?
Answer» Question 16 An object of mass, m is moving with a constant velocity, v. how much work should be done on the object in order to bring the object to rest?

Discussion

12883.	Explain potential energy and kinetic energy with examples and questions
Answer» Explain potential energy and kinetic energy with examples and questions

Discussion

12884.	A current carrying circular conductor placed on a wooden table. An observer holding a compass is looking at it from the top, notices that the south pole of the compass is pointing towards the table. What is the direction of the current in the conductor as seen by the observer?
Answer» A current carrying circular conductor placed on a wooden table. An observer holding a compass is looking at it from the top, notices that the south pole of the compass is pointing towards the table. What is the direction of the current in the conductor as seen by the observer?

Discussion

12885.	The importance of Newton's first law of motion is that:
Answer» The importance of Newton's first law of motion is that:

12885.

The importance of Newton's first law of motion is that:

Answer»

The importance of Newton's first law of motion is that:

Discussion

12886.	Question 13 A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Given, g=10ms−2 and speed of sound = 340ms−1.
Answer» Question 13 A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Given, $g = 10 m s^{- 2}$ and speed of sound = $340 m s^{- 1}$ .

Discussion

12887.	Vijay and Gopal are pulling a block with 24 N force and 8 N force respectively in the opposite directions. The displacement of the block towards Vijay is 6 m. Find the net work done by the forces acting on the block.
Answer» Vijay and Gopal are pulling a block with $24 N$ force and $8 N$ force respectively in the opposite directions. The displacement of the block towards Vijay is $6 m$ . Find the net work done by the forces acting on the block.

Discussion

12888.	Give some examples of Newton's third law of motion.
Answer» Give some examples of Newton's third law of motion.

Discussion

12889.	Loudness and softness of sound depends on
Answer» Loudness and softness of sound depends on

Discussion

12890.	A body is having a charge of 10 C. When it comes in contact with an uncharged body then it looses 1.6 C of charge. Find the number of charges lost.
Answer» A body is having a charge of 10 C. When it comes in contact with an uncharged body then it looses 1.6 C of charge. Find the number of charges lost.

Discussion

12891.	A body is projected vertically upward with an initial velocity u. If acceleration due to gravity is g, time for which it remains in air is:
Answer» A body is projected vertically upward with an initial velocity $u .$ If acceleration due to gravity is $g,$ time for which it remains in air is:

Discussion

12892.	The focal length of a mirror is 15cm, Identify the type of mirror.
Answer» The focal length of a mirror is 15cm, Identify the type of mirror.

Discussion

12893.	The following graph shows the change of a car's speed with time. How far did the car travel (in m) before it reached a constant speed? 100
Answer» The following graph shows the change of a car's speed with time. How far did the car travel (in $m$ ) before it reached a constant speed? 100

12893.

The following graph shows the change of a car's speed with time. How far did the car travel (in m) before it reached a constant speed? 100

Answer» The following graph shows the change of a car's speed with time. How far did the car travel (in

m

) before it reached a constant speed?

100

Discussion

12894.	A body is projected with velocity 'v' from a planet with escape velocity 've'. What will happen if v < ve?
Answer» A body is projected with velocity 'v' from a planet with escape velocity 'v_e'. What will happen if v < v_e?

Discussion

12895.	If there are no external forces acting on an object, it will
Answer» If there are no external forces acting on an object, it will

Discussion

12896.	What type of motion is exhibited by a freely falling body?
Answer» What type of motion is exhibited by a freely falling body?

Discussion

12897.	Characteristic of sound by which loud and soft sounds can be distinguished is ___ .
Answer» Characteristic of sound by which loud and soft sounds can be distinguished is ___ .

Discussion

12898.	Define acceleration.
Answer» Define acceleration.

Discussion

12899.	Current of constant magnitude flowing in one direction is called ___
Answer» Current of constant magnitude flowing in one direction is called ___

Discussion

12900.	During a race, you are accelerating on a leveled track and acquire a velocity 3 times your initial velocity. What was the change in your potential energy?
Answer» During a race, you are accelerating on a leveled track and acquire a velocity 3 times your initial velocity. What was the change in your potential energy?

Discussion

Explore topic-wise InterviewSolutions in .

A small ball carries a charge equal to 'e' Coulomb, where 'e' is the charge on an electron. 20 such balls are put in a cylindrical box and sealed. The total charge in the box will be ___ coulombs.

If the distance between the Earth and the Sun were half its present value, the approximate number of days in a year on the Earth would have been:

What is the work done by the force of gravity when a stone of mass is 250 g is thrown up through a height of 2.5 m?

A car travels from stop A to stop B with a speed of 30 km/h and then returns back to A with a speed of 50 km/h. Find :(a) displacement of the car (b) The average speed of the carA(c) Total distance traveled

What will be the daughter nuclei after 4 alpha decays of 231 91Pa

Question 12 Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.

What would be the relation between velocity of the gun and bullet, if the mass of gun is less than the mass of bullet?

A rubber ball floats on water with its 13rd volume outside water. What is the density of rubber ?

Sound waves are longitudinal waves and consists of compression and rarefaction. A siren has 16 holes and is making 960 revolutions per minute. The frequency of the sound produced by the siren is:

Question 1 (a) Which of the following has more inertia: (a) a rubber ball and a stone of the same size?

A bullet is fired vertically with an initial velocity of 19.6 m/s. (a) How high will it reach? (b) What is the time taken to reach that height?

An appliance has three wires of colours red, black and green, and is connected to a three pin plug. The thickest pin is connected to which wire?

A block of mass 'M' is placed on the top of a bigger inclined plane of mass '10M' as shown in figure. All the surfaces are frictionless. The system is released from rest. Find the distance moved by the bigger block at the instant the smaller block reaches the ground.

Current has both magnitude and direction. Then why is it considered scalar and not vector ? [3 MARKS]

Conservation of Mechanical Energy

When an object is thrown in vertically upward direction, why the final velocity is 0

If the frequency of a wave is 360 Hz and the distance between two nearest compression &amp; rarefaction is 1 m. Then the velocity of wave is

Look at the following table below. Classinterval Classmark 0−5A5−10B10−1512.515−2017.5 The value of A &amp; B respectively are:

What do you mean by free fall? [2 MARKS]

A man running with a uniform speed ‘u’ on a straight road observes a stationary bus at a distance ‘d’ a head of him. At that instant, the bus starts with an acceleration ‘a’. The condition that he would be able to catch the bus is

Generally we observe that when a bus suddenly takes a turn, the passengers are thrown outwards because of

Which of the following mirrors always form a virtual and diminished image irrespective of the object location?

An auto travels with a uniform speed u for the first half duration and the next half duration with a uniform speed v. Find its average speed.

F = K×m×(V−U)t; where K is a constant can be rewritten as:

A man weighs 600N on the equator, but when he moves to the pole he finds a slight increase in his weight. This is because

On the top of a certain mountain where atmospheric pressure is 535 mm Hg, pure water shows a boiling point of 360 K and it takes 3×102 min to boil at the top of the mountain as against 3 min taken to boil an egg at 370 K. The ratio of rate constants K370K360 is ?

Q1: if 4s velocity of a body of mass 50kg increases from 2m/s to 10m/s calculate force?

A body, when acted upon by a force of 10 kgf, gets displaced by 0.5 m. Calculate the work done by the force, when the displacement is (i) in the direction of force, (ii) at an angle of 60o with the force, and (iii) normal to the force.(g=10 N kg−1).

Question 16 An object of mass, m is moving with a constant velocity, v. how much work should be done on the object in order to bring the object to rest?

Explain potential energy and kinetic energy with examples and questions

A current carrying circular conductor placed on a wooden table. An observer holding a compass is looking at it from the top, notices that the south pole of the compass is pointing towards the table. What is the direction of the current in the conductor as seen by the observer?

The importance of Newton's first law of motion is that:

Question 13 A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Given, g=10ms−2 and speed of sound = 340ms−1.

Vijay and Gopal are pulling a block with 24 N force and 8 N force respectively in the opposite directions. The displacement of the block towards Vijay is 6 m. Find the net work done by the forces acting on the block.

Give some examples of Newton's third law of motion.

Loudness and softness of sound depends on

A body is having a charge of 10 C. When it comes in contact with an uncharged body then it looses 1.6 C of charge. Find the number of charges lost.

A body is projected vertically upward with an initial velocity u. If acceleration due to gravity is g, time for which it remains in air is:

The focal length of a mirror is 15cm, Identify the type of mirror.

The following graph shows the change of a car's speed with time. How far did the car travel (in m) before it reached a constant speed? 100

A body is projected with velocity 'v' from a planet with escape velocity 've'. What will happen if v &lt; ve?

If there are no external forces acting on an object, it will

What type of motion is exhibited by a freely falling body?

Characteristic of sound by which loud and soft sounds can be distinguished is ___ .

Define acceleration.

Current of constant magnitude flowing in one direction is called ___

During a race, you are accelerating on a leveled track and acquire a velocity 3 times your initial velocity. What was the change in your potential energy?

If the frequency of a wave is 360 Hz and the distance between two nearest compression & rarefaction is 1 m. Then the velocity of wave is

Look at the following table below. Classinterval Classmark 0−5A5−10B10−1512.515−2017.5 The value of A & B respectively are:

A body is projected with velocity 'v' from a planet with escape velocity 've'. What will happen if v < ve?