9478 + Interview Questions in Physics Page 108 InterviewSolution

5351.	What is meant by rolling friction?
Answer» What is meant by rolling friction?

Discussion

5352.	Which of the following is/are true about frictional force? 1. It depends on the nature of the surface in contact. 2. It always opposes relative motion between two objects. 3. It is a contact force. 4. It is a non- contact force.
Answer» Which of the following is/are true about frictional force? 1. It depends on the nature of the surface in contact. 2. It always opposes relative motion between two objects. 3. It is a contact force. 4. It is a non- contact force.

5352.

Which of the following is/are true about frictional force? 1. It depends on the nature of the surface in contact. 2. It always opposes relative motion between two objects. 3. It is a contact force. 4. It is a non- contact force.

Answer»

Which of the following is/are true about frictional force?

1. It depends on the nature of the surface in contact.

2. It always opposes relative motion between two objects.

3. It is a contact force.

4. It is a non- contact force.

Discussion

5353.	What is thrust?
Answer» What is thrust?

Discussion

5354.	one mole of a gas expands with temperature according to the relation V=kT^{2/3}. What is the work done as the temperature increases by 30^oC
Answer» one mole of a gas expands with temperature according to the relation V=kT^{2/3}. What is the work done as the temperature increases by 30^oC

Discussion

5355.	With whom does the ownership of renewable sources of energy rest?
Answer» With whom does the ownership of renewable sources of energy rest?

Discussion

5356.	What is meant by lubrication ? Why is it important ?
Answer» What is meant by lubrication ? Why is it important ?

Discussion

5357.	Which of the following graphs correctly represents the variation of angle of deviation (δ) with the variation in angle of incidence i for a plane mirror?
Answer» Which of the following graphs correctly represents the variation of angle of deviation $(δ)$ with the variation in angle of incidence $i$ for a plane mirror?

Discussion

5358.	A boy runs his toy car on dry marble fllor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be: (a) Wet marble floor, Dry marble floor, Newspaper, Towel (b) Newspaper, Towel, Dry marble floor, Wet marble floor (c) Towel, Newspaper, Dry marble floor, Wet marble floor (d) Wet marble floor, Dry marble floor, Towel, Newspaper
Answer» A boy runs his toy car on dry marble fllor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be: (a) Wet marble floor, Dry marble floor, Newspaper, Towel (b) Newspaper, Towel, Dry marble floor, Wet marble floor (c) Towel, Newspaper, Dry marble floor, Wet marble floor (d) Wet marble floor, Dry marble floor, Towel, Newspaper

Discussion

5359.	What are mobile electrons
Answer» What are mobile electrons

Discussion

5360.	Question 3A trolley, while going down an inclined plane, has an acceleration of 2 cms−2. What will be its velocity 3 seconds after the start?
Answer» Question 3 A trolley, while going down an inclined plane, has an acceleration of $2 c m s^{- 2} .$ What will be its velocity 3 seconds after the start?

Discussion

5361.	a car moves towards west at a speed of 5m/s for 10s.then it turns and moves due south with same speed for 5second . the average velocity of the car
Answer» a car moves towards west at a speed of 5m/s for 10s.then it turns and moves due south with same speed for 5second . the average velocity of the car

Discussion

5362.	45.Potential difference between A and B in the figure shown is
Answer» 45.Potential difference between A and B in the figure shown is

Discussion

5363.	Which fuel do the artificial satellites use for their revolution around the earth?
Answer» Which fuel do the artificial satellites use for their revolution around the earth?

Discussion

5364.	Question 23You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with well labelled diagram.
Answer» Question 23 You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with well labelled diagram.

Discussion

5365.	Give one practical application of magnetic force.
Answer» Give one practical application of magnetic force.

Discussion

5366.	is critical velocity of liquid is inversely proportional to the radius of the tube
Answer» is critical velocity of liquid is inversely proportional to the radius of the tube

Discussion

5367.	If Q amount of heat is supplied to a gas whose degree of freedom is d and ratio of specific heat at constant pressure to constant volume is gamma then what will be the ratio of following:---1. heat to work done2. heat to change in internal energy3. change in internal energy to work done
Answer» If Q amount of heat is supplied to a gas whose degree of freedom is d and ratio of specific heat at constant pressure to constant volume is gamma then what will be the ratio of following:--- 1. heat to work done 2. heat to change in internal energy 3. change in internal energy to work done

Discussion

5368.	What planning is required in advance to deal with the situation created by a cyclone?
Answer» What planning is required in advance to deal with the situation created by a cyclone?

Discussion

5369.	Will the gauss's law be applicable if it would have not followed the inverse square law?
Answer» Will the gauss's law be applicable if it would have not followed the inverse square law?

Discussion

5370.	What is the relationship between the angle of incidence and the angle of reflection?
Answer» What is the relationship between the angle of incidence and the angle of reflection?

Discussion

5371.	the radius of the earth is about 6400km and that of mars is 3200km the mass of the earth si about 10 times the mass mars .an object weighig 200N on the surface of the earth its wei
Answer» the radius of the earth is about 6400km and that of mars is 3200km the mass of the earth si about 10 times the mass mars .an object weighig 200N on the surface of the earth its wei

Discussion

5372.	The fixed point about which the lever turns in called ____
Answer» The fixed point about which the lever turns in called ____

Discussion

5373.	15. For which element the second ionization enthalpy is expected to be greater, N or O?
Answer» 15. For which element the second ionization enthalpy is expected to be greater, N or O?

Discussion

5374.	A gun of mass m1 fires a bullet of mass m2 with a horizontal speed v0. The gun is fitted with a concave mirror of focal length f facing towards a receding bullet. Find the speed of separations of the bullet and the image just after the gun was fired.
Answer» A gun of mass $m_{1}$ fires a bullet of mass $m_{2}$ with a horizontal speed $v_{0}$ . The gun is fitted with a concave mirror of focal length $f$ facing towards a receding bullet. Find the speed of separations of the bullet and the image just after the gun was fired.

Discussion

5375.	Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim.Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.
Answer» Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim. Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

5375.

Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim.Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

Answer»

Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim.

Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

Discussion

5376.	If we were to hold the candle upside down, what would its image be like?
Answer» If we were to hold the candle upside down, what would its image be like?

Discussion

5377.	A point source of light is placed 4 m below the surface of liquid of refractive index 5/3. The minimum diameter of a disc, which should be placed over the source, on the surface of liquid to cut-off all light coming out of water s
Answer» A point source of light is placed 4 m below the surface of liquid of refractive index 5/3. The minimum diameter of a disc, which should be placed over the source, on the surface of liquid to cut-off all light coming out of water s

Discussion

5378.	(a) What is meant by a contact force? Explain with the help of an example. (b) What is meant by a no-contact force? Explain with the help of an example.
Answer» (a) What is meant by a contact force? Explain with the help of an example. (b) What is meant by a no-contact force? Explain with the help of an example.

5378.

(a) What is meant by a contact force? Explain with the help of an example. (b) What is meant by a no-contact force? Explain with the help of an example.

Answer»

(a) What is meant by a contact force? Explain with the help of an example.

(b) What is meant by a no-contact force? Explain with the help of an example.

Discussion

5379.	The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25oC and it increases the temperature of 18.94 kg of water by 0.632 oC. If the specific heat of water at 25oC is 0.998 cal/g/deg, the value of the heat of combustion of benzoic acid is
Answer» The heat liberated when $1.89 g$ of benzoic acid is burnt in a bomb calorimeter at $25^{o} C$ and it increases the temperature of $18.94 k g$ of water by $0.632^{o} C$ . If the specific heat of water at $25^{o} C$ is $0.998 c a l / g / d e g$ , the value of the heat of combustion of benzoic acid is

Discussion

5380.	The pressures in a liquid at two points in the same horizontal plane are equal. Consider an elevator accelerating upward and a car accelerating on a horizontal road. The above statement is correct in
Answer» The pressures in a liquid at two points in the same horizontal plane are equal. Consider an elevator accelerating upward and a car accelerating on a horizontal road. The above statement is correct in

Discussion

5381.	Give two examples of the substances which expand on heating.
Answer» Give two examples of the substances which expand on heating.

Discussion

5382.	Give an example to show the effect of heat generated in a machine due to excessive friction.
Answer» Give an example to show the effect of heat generated in a machine due to excessive friction.

Discussion

5383.	The major pollutant for ozone depletion is
Answer» The major pollutant for ozone depletion is

Discussion

5384.	bond is formed when attractive forces overcome repulsive forces. what if both are equal for any compound
Answer» bond is formed when attractive forces overcome repulsive forces. what if both are equal for any compound

Discussion

5385.	Knowledge about the past is useful to complete our knowledge of the world we live in.
Answer» Knowledge about the past is useful to complete our knowledge of the world we live in.

Discussion

5386.	Can sound produced on the moon travel to the earth? Give reasons.
Answer» Can sound produced on the moon travel to the earth? Give reasons.

Discussion

5387.	When one body rolls over the surface of another body, the resistance to its motion is called ___ friction.
Answer» When one body rolls over the surface of another body, the resistance to its motion is called ___ friction.

Discussion

5388.	Question 14 A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways. In which of the following cases, pressure exerted by the brick will be (a) maximum when length and breadth form the base (b) maximum when breadth and width form the base (c) maximum when width and length form the base (d) the same in all the above three cases
Answer» Question 14 A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways. In which of the following cases, pressure exerted by the brick will be (a) maximum when length and breadth form the base (b) maximum when breadth and width form the base (c) maximum when width and length form the base (d) the same in all the above three cases

Discussion

5389.	why very very smooth surface has infinte friction force?
Answer» why very very smooth surface has infinte friction force?

Discussion

5390.	If the angle of reflection is 45 °, what will be the angle of incidence?
Answer» If the angle of reflection is 45 °, what will be the angle of incidence?

Discussion

5391.	Metals are good conductors of electricity because of the presence of
Answer» Metals are good conductors of electricity because of the presence of

Discussion

5392.	Two laws of reflection of sound
Answer» Two laws of reflection of sound

Discussion

5393.	What is the advantage of having a key in the circuit?
Answer» What is the advantage of having a key in the circuit?

Discussion

5394.	A child of mass 2 kg is moving on a skateboard at the speed of 2 ms−1. After a force acts on him, his speed becomes 3 ms−1. Find the change in kinetic energy.
Answer» A child of mass 2 kg is moving on a skateboard at the speed of $2 m s^{- 1}$ . After a force acts on him, his speed becomes $3 m s^{- 1}$ . Find the change in kinetic energy.

Discussion

5395.	Q1 Light travels from denser to rarer medium what will be the phase difference Q2 sound travels from denser to rarer medium what will be the phase difference
Answer» Q1 Light travels from denser to rarer medium what will be the phase difference Q2 sound travels from denser to rarer medium what will be the phase difference

Discussion

5396.	Solve for x:xc+xd=1
Answer» $Solve for x:$ $\frac{x}{c} + \frac{x}{d} = 1$

Discussion

5397.	A glass slab (K=10) is introduced between two parallel plates and then the plates are charged.The surface charge density of charge on the plates is 10^{-6}C/m^2 .The surface charge denssity of polarised charge is ?
Answer» A glass slab (K=10) is introduced between two parallel plates and then the plates are charged.The surface charge density of charge on the plates is 10^{-6}C/m^2 .The surface charge denssity of polarised charge is ?

Discussion

5398.	Maninder and his friends are having a party with loud music. Sheila who lives in the neighbourhood has an exam the next day and is getting disturbed by the music. She requests Maninder to tone down the music but he refuses. Do you think this is correct?Mention some considerations you show towards your neighbours.
Answer» Maninder and his friends are having a party with loud music. Sheila who lives in the neighbourhood has an exam the next day and is getting disturbed by the music. She requests Maninder to tone down the music but he refuses. Do you think this is correct? Mention some considerations you show towards your neighbours.

Discussion

5399.	Statement 1: For the same load/force acting on two different surfaces, more pressure is developed on the surface with a smaller area. Statement 2: Pressure is defined as force per unit area.
Answer» Statement 1: For the same load/force acting on two different surfaces, more pressure is developed on the surface with a smaller area. Statement 2: Pressure is defined as force per unit area.

Discussion

5400.	A particle tied to a string of negligible weight & length , l is swung in a horizontal circular path with constant angular velocity having time period, T . if the string length is shortened by l/2 while the particle is in motion , the time period?
Answer» A particle tied to a string of negligible weight & length , l is swung in a horizontal circular path with constant angular velocity having time period, T . if the string length is shortened by l/2 while the particle is in motion , the time period?

Discussion

Explore topic-wise InterviewSolutions in .

What is meant by rolling friction?

Which of the following is/are true about frictional force? 1. It depends on the nature of the surface in contact. 2. It always opposes relative motion between two objects. 3. It is a contact force. 4. It is a non- contact force.

What is thrust?

one mole of a gas expands with temperature according to the relation V=kT^{2/3}. What is the work done as the temperature increases by 30^oC

With whom does the ownership of renewable sources of energy rest?

What is meant by lubrication ? Why is it important ?

Which of the following graphs correctly represents the variation of angle of deviation (δ) with the variation in angle of incidence i for a plane mirror?

What are mobile electrons

Question 3A trolley, while going down an inclined plane, has an acceleration of 2 cms−2. What will be its velocity 3 seconds after the start?

a car moves towards west at a speed of 5m/s for 10s.then it turns and moves due south with same speed for 5second . the average velocity of the car

45.Potential difference between A and B in the figure shown is

Which fuel do the artificial satellites use for their revolution around the earth?

Question 23You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with well labelled diagram.

Give one practical application of magnetic force.

is critical velocity of liquid is inversely proportional to the radius of the tube

If Q amount of heat is supplied to a gas whose degree of freedom is d and ratio of specific heat at constant pressure to constant volume is gamma then what will be the ratio of following:---1. heat to work done2. heat to change in internal energy3. change in internal energy to work done

What planning is required in advance to deal with the situation created by a cyclone?

Will the gauss's law be applicable if it would have not followed the inverse square law?

What is the relationship between the angle of incidence and the angle of reflection?

the radius of the earth is about 6400km and that of mars is 3200km the mass of the earth si about 10 times the mass mars .an object weighig 200N on the surface of the earth its wei

The fixed point about which the lever turns in called ____

15. For which element the second ionization enthalpy is expected to be greater, N or O?

A gun of mass m1 fires a bullet of mass m2 with a horizontal speed v0. The gun is fitted with a concave mirror of focal length f facing towards a receding bullet. Find the speed of separations of the bullet and the image just after the gun was fired.

Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim.Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

If we were to hold the candle upside down, what would its image be like?

A point source of light is placed 4 m below the surface of liquid of refractive index 5/3. The minimum diameter of a disc, which should be placed over the source, on the surface of liquid to cut-off all light coming out of water s

(a) What is meant by a contact force? Explain with the help of an example. (b) What is meant by a no-contact force? Explain with the help of an example.

The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25oC and it increases the temperature of 18.94 kg of water by 0.632 oC. If the specific heat of water at 25oC is 0.998 cal/g/deg, the value of the heat of combustion of benzoic acid is

The pressures in a liquid at two points in the same horizontal plane are equal. Consider an elevator accelerating upward and a car accelerating on a horizontal road. The above statement is correct in

Give two examples of the substances which expand on heating.

Give an example to show the effect of heat generated in a machine due to excessive friction.

The major pollutant for ozone depletion is

bond is formed when attractive forces overcome repulsive forces. what if both are equal for any compound

Knowledge about the past is useful to complete our knowledge of the world we live in.

Can sound produced on the moon travel to the earth? Give reasons.

When one body rolls over the surface of another body, the resistance to its motion is called ___ friction.

why very very smooth surface has infinte friction force?

If the angle of reflection is 45 °, what will be the angle of incidence?

Metals are good conductors of electricity because of the presence of

Two laws of reflection of sound

What is the advantage of having a key in the circuit?

A child of mass 2 kg is moving on a skateboard at the speed of 2 ms−1. After a force acts on him, his speed becomes 3 ms−1. Find the change in kinetic energy.

Q1 Light travels from denser to rarer medium what will be the phase difference Q2 sound travels from denser to rarer medium what will be the phase difference

Solve for x:xc+xd=1

A glass slab (K=10) is introduced between two parallel plates and then the plates are charged.The surface charge density of charge on the plates is 10^{-6}C/m^2 .The surface charge denssity of polarised charge is ?

Statement 1: For the same load/force acting on two different surfaces, more pressure is developed on the surface with a smaller area. Statement 2: Pressure is defined as force per unit area.

A particle tied to a string of negligible weight & length , l is swung in a horizontal circular path with constant angular velocity having time period, T . if the string length is shortened by l/2 while the particle is in motion , the time period?