13232 + Interview Questions in Physics Page 17 InterviewSolution

801.	The value of force in a certain system ofmeasurement is 200 units.If the unit of mass is doubled the unit of length is trebled the unit of time is halved then the value of force in new system of units is x^{1/3 } then the value of x is
Answer» The value of force in a certain system ofmeasurement is 200 units.If the unit of mass is doubled the unit of length is trebled the unit of time is halved then the value of force in new system of units is x^{1/3 } then the value of x is

Discussion

802.	A force produces an acceleration of 5.0 cm s−2 when it acts on a body of mass 20 g. The force in Newton is: 1 dyne = 1 g cm s−2
Answer» A force produces an acceleration of $5.0 c m s^{- 2}$ when it acts on a body of mass $20 g$ . The force in Newton is: 1 dyne = $1 g c m s^{- 2}$

802.

A force produces an acceleration of 5.0 cm s−2 when it acts on a body of mass 20 g. The force in Newton is: 1 dyne = 1 g cm s−2

Answer»

A force produces an acceleration of $5.0 c m s^{- 2}$ when it acts on a body of mass $20 g$ . The force in Newton is:

1 dyne = $1 g c m s^{- 2}$

Discussion

803.	A stone thrown upwards with a speed of 20 metres per second loses speed at the rate of 9.8 metres every second. Find an algebraic expression which gives the speed of the stone at various times.
Answer» A stone thrown upwards with a speed of 20 metres per second loses speed at the rate of 9.8 metres every second. Find an algebraic expression which gives the speed of the stone at various times.

803.

A stone thrown upwards with a speed of 20 metres per second loses speed at the rate of 9.8 metres every second. Find an algebraic expression which gives the speed of the stone at various times.

Answer»

A stone thrown upwards with a speed of 20 metres per second loses speed at the rate of 9.8 metres every second. Find an algebraic expression which gives the speed of the stone at various times.

Discussion

804.	39.Two converging lenses with focal length f and 2f are positioned at 3f distance apart.A parallel beam of light is incident on the lens with focal length f.If d is the incident beam width,what is the width of the emerging beam?
Answer» 39.Two converging lenses with focal length f and 2f are positioned at 3f distance apart.A parallel beam of light is incident on the lens with focal length f.If d is the incident beam width,what is the width of the emerging beam?

Discussion

805.	A force acting on a body doesn't produce motion in it but causes a change in its shape. What kind of force is it?
Answer» A force acting on a body doesn't produce motion in it but causes a change in its shape. What kind of force is it?

Discussion

806.	Question 8 An automobile vehicle has a mass of 1500 kg. What must be the force between the vehicle and road if the vehicle is to be stopped with a negative acceleration of 1.7 ms−2?
Answer» Question 8 An automobile vehicle has a mass of 1500 kg. What must be the force between the vehicle and road if the vehicle is to be stopped with a negative acceleration of 1.7 $m s^{- 2}$ ?

Discussion

807.	An object is placed at distance 10 cm from the focus of a concave mirror and image is at distance 40 cm from focus. The focal length of mirror is
Answer» An object is placed at distance 10 cm from the focus of a concave mirror and image is at distance 40 cm from focus. The focal length of mirror is

Discussion

808.	Question 10Does sound follow the same laws of reflection as light does? Explain.
Answer» Question 10 Does sound follow the same laws of reflection as light does? Explain.

Discussion

809.	What will be the apparent weight of a body of mass 'M' in a lift, moving up with a constant acceleration 'g'? [consider g as acceleration due to gravity]
Answer» What will be the apparent weight of a body of mass 'M' in a lift, moving up with a constant acceleration 'g'? [consider g as acceleration due to gravity]

Discussion

810.	Match the magnitude of net force with the corresponding situation.
Answer» Match the magnitude of net force with the corresponding situation.

Discussion

811.	For a sound wave, the reflected wave, incident wave and the normal to the reflecting surface always lie ___.
Answer» For a sound wave, the reflected wave, incident wave and the normal to the reflecting surface always lie ___.

Discussion

812.	What is the weight of the body placed at the centre of the Earth?
Answer» What is the weight of the body placed at the centre of the Earth?

Discussion

813.	145.a particle is projected from horizontal ground with speed of 20m/s at a certain angle with the horizontal ,so that it just clears two vertical walls of equal heights 10m which are at horizontal distance of 20 m from each other .Find the time taken by the particle to pass between the two walls
Answer» 145.a particle is projected from horizontal ground with speed of 20m/s at a certain angle with the horizontal ,so that it just clears two vertical walls of equal heights 10m which are at horizontal distance of 20 m from each other .Find the time taken by the particle to pass between the two walls

Discussion

814.	Let the charge flowing through a conductor for 15 s be 2 C. Find the current flowing through the conductor.
Answer» Let the charge flowing through a conductor for $15 s$ be $2 C$ . Find the current flowing through the conductor.

Discussion

815.	Why do we feelcool when we touch a piece of ice ?
Answer» Why do we feelcool when we touch a piece of ice ?

Discussion

816.	An electric bulb of rating 50 W is used for 8 hours a day. The number of units of energy used by the electric bulb in a day is:
Answer» An electric bulb of rating $50 W$ is used for $8 hours$ a day. The number of units of energy used by the electric bulb in a day is:

Discussion

817.	The work done in increasing the size of a soap film from 10 cm×6 cm to 10 cm×11 cm is 3×10–4 J. The surface tension of the film is
Answer» The work done in increasing the size of a soap film from $10 cm \times 6 cm$ to $10 cm \times 11 cm$ is $3 \times 10^{- 4} J$ . The surface tension of the film is

Discussion

818.	Give me some tips to find equivalent mass of any substance easily
Answer» Give me some tips to find equivalent mass of any substance easily

Discussion

819.	The tone of the speaker in the first stanza is that of ______________. (i) excitement (ii) anger (iii) hesitation and thoughtfulness (iv) sorrow
Answer» The tone of the speaker in the first stanza is that of ______________. (i) excitement (ii) anger (iii) hesitation and thoughtfulness (iv) sorrow

819.

The tone of the speaker in the first stanza is that of ______________. (i) excitement (ii) anger (iii) hesitation and thoughtfulness (iv) sorrow

Answer»

The tone of the speaker
in the first stanza is that of ______________.

(i) excitement

(ii) anger

(iii) hesitation and
thoughtfulness

(iv)
sorrow

Discussion

820.	Write an expression for the distance S covered in time t by a body which is initially at rest and starts moving with a constant acceleration a.
Answer» Write an expression for the distance S covered in time t by a body which is initially at rest and starts moving with a constant acceleration a.

Discussion

821.	Which of the following has more inertia? A ₹ 10 coin and a ₹ 1 coin.
Answer» Which of the following has more inertia? A ₹ 10 coin and a ₹ 1 coin.

Discussion

822.	The power generated in a windmill ___.
Answer» The power generated in a windmill ___.

Discussion

823.	27.For a particle thrown from the ground obliquely u= (5i + 6j) a= (0i - 10j) the horizontal level range of particle is 12m,. 3m.,.6m,. 10m
Answer» 27.For a particle thrown from the ground obliquely u= (5i + 6j) a= (0i - 10j) the horizontal level range of particle is 12m,. 3m.,.6m,. 10m

Discussion

824.	19. A body is thrown horizontally with a velocity 20m/s from the top of a tower of height 20m. It strikes the levelled ground at a distance x from the foot of the tower the value of x is?
Answer» 19. A body is thrown horizontally with a velocity 20m/s from the top of a tower of height 20m. It strikes the levelled ground at a distance x from the foot of the tower the value of x is?

Discussion

825.	The velocity-time graph below shows the motion of a cyclist. The accelaration will be
Answer» The velocity-time graph below shows the motion of a cyclist. The accelaration will be

Discussion

826.	A wooden ball of density D is immersed in water of density d to a depth h below the surface of water and then released .Upto what height will the ball jump out of water? 1)dh/D 2)(d/D-1)h 3)h 4)zero
Answer» A wooden ball of density D is immersed in water of density d to a depth h below the surface of water and then released .Upto what height will the ball jump out of water? 1)dh/D 2)(d/D-1)h 3)h 4)zero

Discussion

827.	Block diagram of a control system is shown in the figure.The condition that must be satisfied to remove the effect of disturbance on the reponse of the system.
Answer» Block diagram of a control system is shown in the figure. The condition that must be satisfied to remove the effect of disturbance on the reponse of the system.

Discussion

828.	Two boys are playing with a ball on a levelled ground. Boy A throws the ball to height of 5 m and boy B throws to height of 7 m from the ground level. The ratio of the work done by A to B is ________.
Answer» Two boys are playing with a ball on a levelled ground. Boy $A$ throws the ball to height of $5 m$ and boy $B$ throws to height of $7 m$ from the ground level. The ratio of the work done by $A$ to $B$ is ________.

Discussion

829.	A satellite is revolving around the earth in a circular orbit with kinetic energy x the minimum kinetic energy that should be given to it so that it just escapes into out
Answer» A satellite is revolving around the earth in a circular orbit with kinetic energy x the minimum kinetic energy that should be given to it so that it just escapes into out

Discussion

830.	A student has to connect 4 cells of 2 V each to form a battery of voltage 8 V. The correct way of connecting these cells is shown in the figure:(1) A(2) B(3) C(4) D
Answer» A student has to connect 4 cells of 2 V each to form a battery of voltage 8 V. The correct way of connecting these cells is shown in the figure: (1) A (2) B (3) C (4) D

Discussion

831.	Name the unit in which the calorific value of a fuel is expressed.
Answer» Name the unit in which the calorific value of a fuel is expressed.

Discussion

832.	A convex mirror has a radius of curvature of 20 cm. An object is placed at such a distance from the mirror that the size of the image is exactly half that of the object. The object distance must be
Answer» A convex mirror has a radius of curvature of $20 cm$ . An object is placed at such a distance from the mirror that the size of the image is exactly half that of the object. The object distance must be

Discussion

833.	A projectile is fired at a speed of 100 m/s at an angle of 37∘ above the horizontal. At the highest point, the projectile breaks into two parts of mass in ratio 1 : 3, the smaller coming to rest. Find the distance from the launching point to the point where the heavier piece lands.
Answer» A projectile is fired at a speed of 100 m/s at an angle of $37^{\circ}$ above the horizontal. At the highest point, the projectile breaks into two parts of mass in ratio 1 : 3, the smaller coming to rest. Find the distance from the launching point to the point where the heavier piece lands.

833.

A projectile is fired at a speed of 100 m/s at an angle of 37∘ above the horizontal. At the highest point, the projectile breaks into two parts of mass in ratio 1 : 3, the smaller coming to rest. Find the distance from the launching point to the point where the heavier piece lands.

Answer»

A projectile is fired at a speed of 100 m/s at an angle of $37^{\circ}$ above the horizontal. At the highest point, the projectile breaks into two parts of mass in ratio 1 : 3, the smaller coming to rest. Find the distance from the launching point to the point where the heavier piece lands.

Discussion

834.	If a force of 250 N act on body, the momentum acquired is 125 kg-m/s. What is the period for which force acts on the body
Answer» If a force of 250 N act on body, the momentum acquired is 125 kg-m/s. What is the period for which force acts on the body

Discussion

835.	What are all the differences in Alternated Current and Direct Current?
Answer» What are all the differences in Alternated Current and Direct Current?

Discussion

836.	A ball of mass 50g is thrown vertically upwards with an initial velocity 20ms−1. Calculate the maximum height reached, if air friction is neglected. Take g=10ms−2.
Answer» A ball of mass $50 g$ is thrown vertically upwards with an initial velocity $20 m s^{- 1}$ . Calculate the maximum height reached, if air friction is neglected. Take $g = 10 m s^{- 2}$ .

Discussion

837.	mind map of force and laws of motion
Answer» mind map of force and laws of motion

Discussion

838.	A stationary sound wave source having frequency fo.sound i s reflected fro m verticl plane surface moving towards source with speed v. if speed of sound in medium is c, then frequency of reflected wav e ia recieved by stationary observer near source i
Answer» A stationary sound wave source having frequency fo.sound i s reflected fro m verticl plane surface moving towards source with speed v. if speed of sound in medium is c, then frequency of reflected wav e ia recieved by stationary observer near source i

Discussion

839.	a cylinder of mass 10 of and radius 15 cm is rolling perfectly on plane of inclination 30 degree and length 1m if coefficient of friction 0.25 work done against friction isWhat is pure rolling When does friction act while rolling
Answer» a cylinder of mass 10 of and radius 15 cm is rolling perfectly on plane of inclination 30 degree and length 1m if coefficient of friction 0.25 work done against friction is What is pure rolling When does friction act while rolling

Discussion

840.	Which pair of the following graphs represents the same motion?
Answer» Which pair of the following graphs represents the same motion?

Discussion

841.	Explain aquatic biome in detail.
Answer» Explain aquatic biome in detail.

Discussion

842.	The position of a body moving along X- axis is given by X= (t^2 -4t+6)m. The distance travelled by body in time interval t=0 to t=3 is?
Answer» The position of a body moving along X- axis is given by X= (t^2 -4t+6)m. The distance travelled by body in time interval t=0 to t=3 is?

Discussion

843.	In which of the following graphs are both runners moving at the same speed?
Answer» In which of the following graphs are both runners moving at the same speed?

843.

In which of the following graphs are both runners moving at the same speed?

Answer»

In which of the following graphs are both runners moving at the same speed?

Discussion

844.	The average time taken by a normal person to react to an emergency is one fifteenth of a second and is called reaction time. The reaction time of people increases when they are intoxicated. If a bus is moving with a velocity of 90km/hr and its driver sees a child running across the road, how much distance had the bus moved if the reaction time of driver was ½ second under the influence of alcohol?
Answer» The average time taken by a normal person to react to an emergency is one fifteenth of a second and is called reaction time. The reaction time of people increases when they are intoxicated. If a bus is moving with a velocity of 90km/hr and its driver sees a child running across the road, how much distance had the bus moved if the reaction time of driver was ½ second under the influence of alcohol?

Discussion

845.	State the universal law of gravitation. The mass of the electron and proton in a Hydrogen atom is given by 9×10−31 kg and 1.9×10−27 kg respectively which is separated by a distance 6×10−11 m. Calculate the gravitational force of attraction between them? [3 MARKS]
Answer» State the universal law of gravitation. The mass of the electron and proton in a Hydrogen atom is given by $9 \times 10^{- 31} k g$ and $1.9 \times 10^{- 27} k g$ respectively which is separated by a distance $6 \times 10^{- 11} m$ . Calculate the gravitational force of attraction between them? [3 MARKS]

Discussion

846.	When sound waves travel from a rarer medium to a denser medium with same elastic properties, its speed:
Answer» When sound waves travel from a rarer medium to a denser medium with same elastic properties, its speed:

Discussion

847.	Two bodies A and B of masses m and M (M>>m) have same kinetic energy.Which body will have more momentum?
Answer» Two bodies A and B of masses m and M (M>>m) have same kinetic energy.Which body will have more momentum?

Discussion

848.	A race scooter is seen accelerating uniformly from 18.5m/s to 46.1m/s in 2.47 seconds. Determine the acceleration of the scooter and the distance covered.
Answer» A race scooter is seen accelerating uniformly from 18.5m/s to 46.1m/s in 2.47 seconds. Determine the acceleration of the scooter and the distance covered.

Discussion

849.	Find the effective resistance in the following circuit.
Answer» Find the effective resistance in the following circuit.

Discussion

850.	The magnitude of inertia of a body is determined by its: __
Answer» The magnitude of inertia of a body is determined by its: __

Discussion

Explore topic-wise InterviewSolutions in .

The value of force in a certain system ofmeasurement is 200 units.If the unit of mass is doubled the unit of length is trebled the unit of time is halved then the value of force in new system of units is x^{1/3 } then the value of x is

A force produces an acceleration of 5.0 cm s−2 when it acts on a body of mass 20 g. The force in Newton is: 1 dyne = 1 g cm s−2

A stone thrown upwards with a speed of 20 metres per second loses speed at the rate of 9.8 metres every second. Find an algebraic expression which gives the speed of the stone at various times.

39.Two converging lenses with focal length f and 2f are positioned at 3f distance apart.A parallel beam of light is incident on the lens with focal length f.If d is the incident beam width,what is the width of the emerging beam?

A force acting on a body doesn't produce motion in it but causes a change in its shape. What kind of force is it?

Question 8 An automobile vehicle has a mass of 1500 kg. What must be the force between the vehicle and road if the vehicle is to be stopped with a negative acceleration of 1.7 ms−2?

An object is placed at distance 10 cm from the focus of a concave mirror and image is at distance 40 cm from focus. The focal length of mirror is

Question 10Does sound follow the same laws of reflection as light does? Explain.

What will be the apparent weight of a body of mass 'M' in a lift, moving up with a constant acceleration 'g'? [consider g as acceleration due to gravity]

Match the magnitude of net force with the corresponding situation.

For a sound wave, the reflected wave, incident wave and the normal to the reflecting surface always lie ___.

What is the weight of the body placed at the centre of the Earth?

145.a particle is projected from horizontal ground with speed of 20m/s at a certain angle with the horizontal ,so that it just clears two vertical walls of equal heights 10m which are at horizontal distance of 20 m from each other .Find the time taken by the particle to pass between the two walls

Let the charge flowing through a conductor for 15 s be 2 C. Find the current flowing through the conductor.

Why do we feelcool when we touch a piece of ice ?

An electric bulb of rating 50 W is used for 8 hours a day. The number of units of energy used by the electric bulb in a day is:

The work done in increasing the size of a soap film from 10 cm×6 cm to 10 cm×11 cm is 3×10–4 J. The surface tension of the film is

Give me some tips to find equivalent mass of any substance easily

The tone of the speaker in the first stanza is that of ______________. (i) excitement (ii) anger (iii) hesitation and thoughtfulness (iv) sorrow

Write an expression for the distance S covered in time t by a body which is initially at rest and starts moving with a constant acceleration a.

Which of the following has more inertia? A ₹ 10 coin and a ₹ 1 coin.

The power generated in a windmill ___.

27.For a particle thrown from the ground obliquely u= (5i + 6j) a= (0i - 10j) the horizontal level range of particle is 12m,. 3m.,.6m,. 10m

19. A body is thrown horizontally with a velocity 20m/s from the top of a tower of height 20m. It strikes the levelled ground at a distance x from the foot of the tower the value of x is?

The velocity-time graph below shows the motion of a cyclist. The accelaration will be

A wooden ball of density D is immersed in water of density d to a depth h below the surface of water and then released .Upto what height will the ball jump out of water? 1)dh/D 2)(d/D-1)h 3)h 4)zero

Block diagram of a control system is shown in the figure.The condition that must be satisfied to remove the effect of disturbance on the reponse of the system.

Two boys are playing with a ball on a levelled ground. Boy A throws the ball to height of 5 m and boy B throws to height of 7 m from the ground level. The ratio of the work done by A to B is ________.

A satellite is revolving around the earth in a circular orbit with kinetic energy x the minimum kinetic energy that should be given to it so that it just escapes into out

A student has to connect 4 cells of 2 V each to form a battery of voltage 8 V. The correct way of connecting these cells is shown in the figure:(1) A(2) B(3) C(4) D

Name the unit in which the calorific value of a fuel is expressed. ​

A convex mirror has a radius of curvature of 20 cm. An object is placed at such a distance from the mirror that the size of the image is exactly half that of the object. The object distance must be

A projectile is fired at a speed of 100 m/s at an angle of 37∘ above the horizontal. At the highest point, the projectile breaks into two parts of mass in ratio 1 : 3, the smaller coming to rest. Find the distance from the launching point to the point where the heavier piece lands.

If a force of 250 N act on body, the momentum acquired is 125 kg-m/s. What is the period for which force acts on the body

What are all the differences in Alternated Current and Direct Current?

A ball of mass 50g is thrown vertically upwards with an initial velocity 20ms−1. Calculate the maximum height reached, if air friction is neglected. Take g=10ms−2.

mind map of force and laws of motion

A stationary sound wave source having frequency fo.sound i s reflected fro m verticl plane surface moving towards source with speed v. if speed of sound in medium is c, then frequency of reflected wav e ia recieved by stationary observer near source i

a cylinder of mass 10 of and radius 15 cm is rolling perfectly on plane of inclination 30 degree and length 1m if coefficient of friction 0.25 work done against friction isWhat is pure rolling When does friction act while rolling

Which pair of the following graphs represents the same motion?

Explain aquatic biome in detail.

The position of a body moving along X- axis is given by X= (t^2 -4t+6)m. The distance travelled by body in time interval t=0 to t=3 is?

In which of the following graphs are both runners moving at the same speed?

State the universal law of gravitation. The mass of the electron and proton in a Hydrogen atom is given by 9×10−31 kg and 1.9×10−27 kg respectively which is separated by a distance 6×10−11 m. Calculate the gravitational force of attraction between them? [3 MARKS]

When sound waves travel from a rarer medium to a denser medium with same elastic properties, its speed:

Two bodies A and B of masses m and M (M&gt;&gt;m) have same kinetic energy.Which body will have more momentum?

A race scooter is seen accelerating uniformly from 18.5m/s to 46.1m/s in 2.47 seconds. Determine the acceleration of the scooter and the distance covered.

Find the effective resistance in the following circuit.

The magnitude of inertia of a body is determined by its: __

Name the unit in which the calorific value of a fuel is expressed.

Two bodies A and B of masses m and M (M>>m) have same kinetic energy.Which body will have more momentum?