13232 + Interview Questions in Physics Page 121 InterviewSolution

6001.	A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m s−1.Calculate the maximum potential energy it gains as it goes up.
Answer» A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m $s^{- 1}$ .Calculate the maximum potential energy it gains as it goes up.

Discussion

6002.	Define one ohm. A resistance of 6 ohms is connected in series with another resistance of 4 ohms.A potential difference of 20 volts is applied across the combination.Calculate the current through the circuit and potential difference across the 6 ohm resistance.
Answer» Define one ohm. A resistance of 6 ohms is connected in series with another resistance of 4 ohms. A potential difference of 20 volts is applied across the combination. Calculate the current through the circuit and potential difference across the 6 ohm resistance.

Discussion

6003.	A narrow glass tube, 80 cm long and opens at both ends, is half immersed in mercury, now the top of the tube is closed and is taken out of mercury. A column of mercury 20 cm long remains in the tube. Find atmospheric pressure An 60 cm of Hg column
Answer» A narrow glass tube, 80 cm long and opens at both ends, is half immersed in mercury, now the top of the tube is closed and is taken out of mercury. A column of mercury 20 cm long remains in the tube. Find atmospheric pressure An 60 cm of Hg column

Discussion

6004.	Acceleration due to gravity g near the surface of a planet of mass M and radius R is given by:G is the Universal constant.
Answer» Acceleration due to gravity $g$ near the surface of a planet of mass $M$ and radius $R$ is given by: $G$ is the Universal constant.

Discussion

6005.	48.A solid ball struck by cue . Line of action of applied impulse passes through centre of ball. Inutial velocity of ball is v and its mass M mu friction coffiecient . Dis†an ce travelled before it ceases to slip on floor is
Answer» 48.A solid ball struck by cue . Line of action of applied impulse passes through centre of ball. Inutial velocity of ball is v and its mass M mu friction coffiecient . Dis†an ce travelled before it ceases to slip on floor is

Discussion

6006.	What do you mean by reflection of sound ? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.
Answer» What do you mean by reflection of sound ? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.

6006.

What do you mean by reflection of sound ? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.

Answer»

What do you mean by reflection of sound ?

State one condition for the reflection of a sound wave.

Name a device in which reflection of sound wave is used.

Discussion

6007.	Which of the following quantities is a vector quantity?
Answer» Which of the following quantities is a vector quantity?

Discussion

6008.	A ball is thrown with same velocity on the surface of earth as well as on the moon. Compare the maximum potential energy attained by the ball on the earth and on the moon. [Assume gearth=10ms−2 and gmoon=2ms−2]
Answer» A ball is thrown with same velocity on the surface of earth as well as on the moon. Compare the maximum potential energy attained by the ball on the earth and on the moon. [Assume $g_{e a r t h} = 10 m s^{- 2}$ and $g_{m o o n} = 2 m s^{- 2}$ ]

Discussion

6009.	Tinku dropped a stone into a very deep well.He hears the sound 6.53s after he dropped the stone. Find the depth of the well. Take acceleration due to gravity,g=10m/s² and v sound = 340m/s.
Answer» Tinku dropped a stone into a very deep well.He hears the sound 6.53s after he dropped the stone. Find the depth of the well. Take acceleration due to gravity,g=10m/s² and v sound = 340m/s.

Discussion

6010.	(a) Define the following terms: (i) Echolocation (ii) Echocardiography, and (iii) Ultrasonography.(b) Name an animal which navigates and finds food by echolocation.(c) Which of the two produces ultrasonic waves: porpoise or whale?
Answer» (a) Define the following terms: (i) Echolocation (ii) Echocardiography, and (iii) Ultrasonography. (b) Name an animal which navigates and finds food by echolocation. (c) Which of the two produces ultrasonic waves: porpoise or whale?

Discussion

6011.	Question 2 Two persons manage to push a motorcar of mass 1200 kg at a uniform velocity along a level road. The same motorcar can be pushed by three persons to produce an acceleration of 0.2 ms−2. With what force does each person push the motorcar? (Assume that all persons push the motorcar with the same muscular effort)
Answer» Question 2 Two persons manage to push a motorcar of mass 1200 kg at a uniform velocity along a level road. The same motorcar can be pushed by three persons to produce an acceleration of $0.2 m s^{- 2}$ . With what force does each person push the motorcar? (Assume that all persons push the motorcar with the same muscular effort)

Discussion

6012.	A body of mass 5 kg undergoes a change in speed from 30 m/s to 40m/s. Calculate the increase in its momentum?
Answer» A body of mass 5 kg undergoes a change in speed from 30 m/s to 40m/s. Calculate the increase in its momentum?

Discussion

6013.	Neutron is a fundamental particle which carries?
Answer» Neutron is a fundamental particle which carries?

Discussion

6014.	An object is placed at 60 m in front of a concave mirror. If its radius of curvature is 40 m, then the image distance is equal to ___ m.
Answer» An object is placed at 60 m in front of a concave mirror. If its radius of curvature is 40 m, then the image distance is equal to ___ m.

Discussion

6015.	Even though the magnitude of action force and reaction force are equal and thier directions are opposite,thier effects do not get cancelled.Why?
Answer» Even though the magnitude of action force and reaction force are equal and thier directions are opposite,thier effects do not get cancelled.Why?

Discussion

6016.	If the direction of electric current in a solenoid, when viewed from one of its ends, is anticlockwise. The pole of this end of the solenoid is ___ .
Answer» If the direction of electric current in a solenoid, when viewed from one of its ends, is anticlockwise. The pole of this end of the solenoid is ___ .

Discussion

6017.	A particle is moving in a straight line and its speed depends on time as v=\|2t-3\| ( modulus function). Integral of vdt represents the distance travelled of the particle .then find the displacement in 5 seconds. 1)65m 2)12.25m 3)2.25m 4)14.5m
Answer» A particle is moving in a straight line and its speed depends on time as v=\|2t-3\| ( modulus function). Integral of vdt represents the distance travelled of the particle .then find the displacement in 5 seconds. 1)65m 2)12.25m 3)2.25m 4)14.5m

Discussion

6018.	The penetration power within a principal quantum number goes like
Answer» The penetration power within a principal quantum number goes like

Discussion

6019.	The pressure at a depth of 200 m below the surface of the sea, will be ___KPa. The density of seawater is 1024 kg/m3.
Answer» The pressure at a depth of 200 m below the surface of the sea, will be ___KPa. The density of seawater is 1024 kg/m³.

6019.

The pressure at a depth of 200 m below the surface of the sea, will be ___KPa. The density of seawater is 1024 kg/m3.

Answer»

The pressure at a depth of 200 m below the surface of the sea, will be ___KPa.

The density of seawater is 1024 kg/m³.

Discussion

6020.	How to find a least count of a spring balance?
Answer» How to find a least count of a spring balance?

Discussion

6021.	A car is moving with speed 3.5 m/s. If the radius of its tyre is 0.35 m, then calculate the angular velocity of the wheel of the car.
Answer» A car is moving with speed $3.5 m/s$ . If the radius of its tyre is $0.35 m$ , then calculate the angular velocity of the wheel of the car.

Discussion

6022.	Answer the following:(1) Explain with proper examples − ‘Motion is relative’.(2) State any five examples of uniform circular motion.(3) Illustrate with examples where the motion of the body can not be directly perceived but can be experienced.
Answer» Answer the following: (1) Explain with proper examples − ‘Motion is relative’. (2) State any five examples of uniform circular motion. (3) Illustrate with examples where the motion of the body can not be directly perceived but can be experienced.

6022.

Answer the following:(1) Explain with proper examples − ‘Motion is relative’.(2) State any five examples of uniform circular motion.(3) Illustrate with examples where the motion of the body can not be directly perceived but can be experienced.

Answer»

Answer the following:

(1) Explain with proper examples − ‘Motion is relative’.

(2) State any five examples of uniform circular motion.

(3) Illustrate with examples where the motion of the body can not be directly perceived but can be experienced.

Discussion

6023.	Two trains each of length 100 m moving parallel towards each other at speed 72 km/h and36 km/h respectively. In how much time will they cross each other?(1) 4.5 s(2) 6.67(3) 3.5 s(4) 7.25s
Answer» Two trains each of length 100 m moving parallel towards each other at speed 72 km/h and 36 km/h respectively. In how much time will they cross each other? (1) 4.5 s (2) 6.67 (3) 3.5 s (4) 7.25s

Discussion

6024.	What is the least count of a thermometer having 20 divisions between 0∘C and 20∘C mark?
Answer» What is the least count of a thermometer having 20 divisions between $0^{\circ} C$ and $20^{\circ} C$ mark?

Discussion

6025.	A body will experience minimum upthrust when it is completely immersed in : (a) turpentine (b) water (c) glycerine (d) mercury.
Answer» A body will experience minimum upthrust when it is completely immersed in : (a) turpentine (b) water (c) glycerine (d) mercury.

6025.

A body will experience minimum upthrust when it is completely immersed in : (a) turpentine (b) water (c) glycerine (d) mercury.

Answer»

A body will experience minimum upthrust when it is completely immersed in :
(a) turpentine

(b) water
(c) glycerine

(d) mercury.

Discussion

6026.	सत्य का दिखना और ओझल होना से कवि का क्या तात्पर्य है?
Answer» सत्य का दिखना और ओझल होना से कवि का क्या तात्पर्य है?

Discussion

6027.	What is the difference between intensity of gravitational field and acceleration due to gravity?
Answer» What is the difference between intensity of gravitational field and acceleration due to gravity?

Discussion

6028.	Are the constellations, members of our solar system?
Answer» Are the constellations, members of our solar system?

Discussion

6029.	Considering the motion of the object whose velocity - time graph is given in the dig. , Calculate the total displacement till 16 seconds
Answer» Considering the motion of the object whose velocity - time graph is given in the dig. , Calculate the total displacement till 16 seconds

Discussion

6030.	The figure shows a circuit consisting of an ideal cell of emf E=10 V, an inductor of inductance L=2 H and a resistor of resistance R=5 Ω connected in series. The switch S is closed at t=0. Suppose at t=0, current in the inductor is i0=1 A, then find out the equation of current as a function of time.
Answer» The figure shows a circuit consisting of an ideal cell of emf $E = 10 V$ , an inductor of inductance $L = 2 H$ and a resistor of resistance $R = 5 Ω$ connected in series. The switch $S$ is closed at $t = 0.$ Suppose at $t = 0$ , current in the inductor is $i_{0} = 1 A$ , then find out the equation of current as a function of time.

Discussion

6031.	During a race, you are accelerating on a leveled track and acquire a velocity three times your initial velocity. What is the change in your potential energy?
Answer» During a race, you are accelerating on a leveled track and acquire a velocity three times your initial velocity. What is the change in your potential energy?

Discussion

6032.	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

6033.	Explain refraction in prism also derive expression of this
Answer» Explain refraction in prism also derive expression of this

Discussion

6034.	The slope of the distance-time graph is:
Answer» The slope of the distance-time graph is:

Discussion

6035.	People living in this region do not fall off into space. Why?
Answer» People living in this region do not fall off into space. Why?

Discussion

6036.	A ray of light is incident at 60∘, on glass-air interface. Then the light ray will ___. (Given: Incident ray lies in glass).Use : [μg = √2 , μa = 1]
Answer» A ray of light is incident at $60^{\circ}$ , on glass-air interface. Then the light ray will ___. (Given: Incident ray lies in glass). Use : [ $μ_{g}$ = $\sqrt{2}$ , $μ_{a}$ = 1]

Discussion

6037.	force acting on a body varies with time as shown below if initial momentum of the body is p then the time taken by the body to retain its momentum again is
Answer» force acting on a body varies with time as shown below if initial momentum of the body is p then the time taken by the body to retain its momentum again is

Discussion

6038.	Question 14A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity.
Answer» Question 14 A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity.

Discussion

6039.	A motorist accelerates from rest to a velocity of 90 km hr−1 in 15 seconds. What is the average acceleration of the car?
Answer» A motorist accelerates from rest to a velocity of $90 k m h r^{- 1}$ in $15$ seconds. What is the average acceleration of the car?

Discussion

6040.

Rewrite the following table so as to match the second and third column with the first column: Column 1 Column 2 Column 3 Newton’s first law of motion Describes the relationship between the forces on two interacting objects. In a high jump athletic event, the athletes are made to fall on a sand bed. Newton’s second law of motion. Gives an idea of the effects of force Motion of rocket Newton’s third law of motion Also called as law of inertia Only the carrom coin at the bottom of a pile is removed when a fast moving striker hits it.

Answer»

Rewrite the following table so as to match the second and third column with the first column:

Column 1	Column 2	Column 3
Newton’s first law of motion	Describes the relationship between the forces on two interacting objects.	In a high jump athletic event, the athletes are made to fall on a sand bed.
Newton’s second law of motion.	Gives an idea of the effects of force	Motion of rocket
Newton’s third law of motion	Also called as law of inertia	Only the carrom coin at the bottom of a pile is removed when a fast moving striker hits it.

Discussion

6041.	Question 18In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
Answer» Question 18 In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.

Discussion

6042.	SI unit of temperature is
Answer» SI unit of temperature is

Discussion

6043.	A boy, sitting in a bus moving with moving with uniform velocity, throws a ball vertically upwards. While falling down, the ball1) Ahead of him2) Back in the boy's hands 3) Behind him 4) Randomly in any directionand why?
Answer» A boy, sitting in a bus moving with moving with uniform velocity, throws a ball vertically upwards. While falling down, the ball 1) Ahead of him 2) Back in the boy's hands 3) Behind him 4) Randomly in any direction and why?

Discussion

6044.	In a vernier callipers, one main scale division is 1 mm and 9 main scale divisions are equal to 10 vernier scale divisions. When nothing is put between jaws of the callipers, zero of the vernier scale lies to the right side of zero of the main scale and the 2nd division of the vernier scale coincides with a main scale division. While measuring inner diameter of a hollow cylinder the zero of vernier scale lies between 1.7 cm and 1.8 cm of the main scale. Also, 8th division of the vernier scale coincides with a main scale division. Inner diameter of the cylinder is
Answer» In a vernier callipers, one main scale division is 1 mm and 9 main scale divisions are equal to 10 vernier scale divisions. When nothing is put between jaws of the callipers, zero of the vernier scale lies to the right side of zero of the main scale and the 2nd division of the vernier scale coincides with a main scale division. While measuring inner diameter of a hollow cylinder the zero of vernier scale lies between 1.7 cm and 1.8 cm of the main scale. Also, 8th division of the vernier scale coincides with a main scale division. Inner diameter of the cylinder is

Discussion

6045.	81.The normal density of gold is p and its modulus is B. The increase in density of piece of gold when pressure P is applied uniformly from all sides?.
Answer» 81.The normal density of gold is p and its modulus is B. The increase in density of piece of gold when pressure P is applied uniformly from all sides?.

Discussion

6046.	Just like in sound waves we have particles oscillating back and forth why is it that we have oscillating electric and magnetic fields in case of light and not particles oscillating and magnetic fields and not particles ,as in case of sound waves?
Answer» Just like in sound waves we have particles oscillating back and forth why is it that we have oscillating electric and magnetic fields in case of light and not particles oscillating and magnetic fields and not particles ,as in case of sound waves?

Discussion

6047.	Which of the following affects the time period of a pendulum?
Answer» Which of the following affects the time period of a pendulum?

Discussion

6048.	Which one of the following diseases is due to the low converging power of the lens?
Answer» Which one of the following diseases is due to the low converging power of the lens?

Discussion

6049.	The Calorific Value Of A Fuel Is Expressed In A Unit Called As_____
Answer» The Calorific Value Of A Fuel Is Expressed In A Unit Called As_____

Discussion

6050.	A boy climbs a pole of 5m . On doing so he does a work of 5000J. Calculate his mass.
Answer» A boy climbs a pole of 5m . On doing so he does a work of 5000J. Calculate his mass.

Discussion

Explore topic-wise InterviewSolutions in .

A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m s−1.Calculate the maximum potential energy it gains as it goes up.

Define one ohm. A resistance of 6 ohms is connected in series with another resistance of 4 ohms.A potential difference of 20 volts is applied across the combination.Calculate the current through the circuit and potential difference across the 6 ohm resistance.

A narrow glass tube, 80 cm long and opens at both ends, is half immersed in mercury, now the top of the tube is closed and is taken out of mercury. A column of mercury 20 cm long remains in the tube. Find atmospheric pressure An 60 cm of Hg column

Acceleration due to gravity g near the surface of a planet of mass M and radius R is given by:G is the Universal constant.

48.A solid ball struck by cue . Line of action of applied impulse passes through centre of ball. Inutial velocity of ball is v and its mass M mu friction coffiecient . Dis†an ce travelled before it ceases to slip on floor is

What do you mean by reflection of sound ? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.

Which of the following quantities is a vector quantity?

A ball is thrown with same velocity on the surface of earth as well as on the moon. Compare the maximum potential energy attained by the ball on the earth and on the moon. [Assume gearth=10ms−2 and gmoon=2ms−2]

Tinku dropped a stone into a very deep well.He hears the sound 6.53s after he dropped the stone. Find the depth of the well. Take acceleration due to gravity,g=10m/s² and v sound = 340m/s.

(a) Define the following terms: (i) Echolocation (ii) Echocardiography, and (iii) Ultrasonography.(b) Name an animal which navigates and finds food by echolocation.(c) Which of the two produces ultrasonic waves: porpoise or whale?

A body of mass 5 kg undergoes a change in speed from 30 m/s to 40m/s. Calculate the increase in its momentum?

Neutron is a fundamental particle which carries?

An object is placed at 60 m in front of a concave mirror. If its radius of curvature is 40 m, then the image distance is equal to ___ m.

Even though the magnitude of action force and reaction force are equal and thier directions are opposite,thier effects do not get cancelled.Why?

If the direction of electric current in a solenoid, when viewed from one of its ends, is anticlockwise. The pole of this end of the solenoid is ___ .

A particle is moving in a straight line and its speed depends on time as v=|2t-3| ( modulus function). Integral of vdt represents the distance travelled of the particle .then find the displacement in 5 seconds. 1)65m 2)12.25m 3)2.25m 4)14.5m

The penetration power within a principal quantum number goes like

The pressure at a depth of 200 m below the surface of the sea, will be ___KPa. The density of seawater is 1024 kg/m3.

How to find a least count of a spring balance?

A car is moving with speed 3.5 m/s. If the radius of its tyre is 0.35 m, then calculate the angular velocity of the wheel of the car.

Answer the following:(1) Explain with proper examples − ‘Motion is relative’.(2) State any five examples of uniform circular motion.(3) Illustrate with examples where the motion of the body can not be directly perceived but can be experienced.

Two trains each of length 100 m moving parallel towards each other at speed 72 km/h and36 km/h respectively. In how much time will they cross each other?(1) 4.5 s(2) 6.67(3) 3.5 s(4) 7.25s

What is the least count of a thermometer having 20 divisions between 0∘C and 20∘C mark?

A body will experience minimum upthrust when it is completely immersed in : (a) turpentine (b) water (c) glycerine (d) mercury.

सत्य का दिखना और ओझल होना से कवि का क्या तात्पर्य है?

What is the difference between intensity of gravitational field and acceleration due to gravity?

Are the constellations, members of our solar system?

Considering the motion of the object whose velocity - time graph is given in the dig. , Calculate the total displacement till 16 seconds

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

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:

Explain refraction in prism also derive expression of this

The slope of the distance-time graph is:

People living in this region do not fall off into space. Why?

A ray of light is incident at 60∘, on glass-air interface. Then the light ray will ___. (Given: Incident ray lies in glass).Use : [μg = √2 , μa = 1]

force acting on a body varies with time as shown below if initial momentum of the body is p then the time taken by the body to retain its momentum again is

Question 14A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity.

A motorist accelerates from rest to a velocity of 90 km hr−1 in 15 seconds. What is the average acceleration of the car?

Question 18In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.

SI unit of temperature is

A boy, sitting in a bus moving with moving with uniform velocity, throws a ball vertically upwards. While falling down, the ball1) Ahead of him2) Back in the boy's hands 3) Behind him 4) Randomly in any directionand why?

81.The normal density of gold is p and its modulus is B. The increase in density of piece of gold when pressure P is applied uniformly from all sides?.

Just like in sound waves we have particles oscillating back and forth why is it that we have oscillating electric and magnetic fields in case of light and not particles oscillating and magnetic fields and not particles ,as in case of sound waves?

Which of the following affects the time period of a pendulum?

Which one of the following diseases is due to the low converging power of the lens?

The Calorific Value Of A Fuel Is Expressed In A Unit Called As_____

A boy climbs a pole of 5m . On doing so he does a work of 5000J. Calculate his mass.