13232 + Interview Questions in Physics Page 244 InterviewSolution

12151.	Why does a gas exert pressure on walls of the container?
Answer» Why does a gas exert pressure on walls of the container?

Discussion

12152.	In a lift, the apparent weight becomes twice the actual weight when
Answer» In a lift, the apparent weight becomes twice the actual weight when

Discussion

12153.	Find the amplitude of vibration of the particles of air through which a sound wave of intensity 2.0 × 10−6W m−2 and frequency 1.0 kHz is passing. Density of air =1.2 kgm−3and speed of sound in air =330ms−1
Answer» Find the amplitude of vibration of the particles of air through which a sound wave of intensity $2.0 \times 10^{- 6} W m^{- 2}$ and frequency 1.0 kHz is passing. Density of air = $1.2 k g m^{- 3}$ and speed of sound in air = $330 m s^{- 1}$

Discussion

12154.	In order to catch a ball, a baseball player naturally moves his or her hand backward in the direction of the ball's motion once the ball contacts the hand. This habit causes the force of impact on the players hand to be reduced principally; because ___.
Answer» In order to catch a ball, a baseball player naturally moves his or her hand backward in the direction of the ball's motion once the ball contacts the hand. This habit causes the force of impact on the players hand to be reduced principally; because ___.

Discussion

12155.	A body floats in a liquid with a part of it submerged inside the liquid then the weight of the floating body is?
Answer» A body floats in a liquid with a part of it submerged inside the liquid then the weight of the floating body is?

Discussion

12156.	Consider iron and water. In which of the given media does the sound travel faster?___
Answer» Consider iron and water. In which of the given media does the sound travel faster?___

Discussion

12157.	An object of mass 2 kg is sliding with a constant velocity of 4 ms−1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
Answer» An object of mass 2 kg is sliding with a constant velocity of $4 m s^{- 1}$ on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

Discussion

12158.	It is easy to push an empty box than the same box full of books, because _____.
Answer» It is easy to push an empty box than the same box full of books, because _____.

Discussion

12159.	When light strikes the surface of a non-metallic material it bounces off in all directions due to ___.
Answer» When light strikes the surface of a non-metallic material it bounces off in all directions due to ___.

Discussion

12160.	Which of the following statements is/are TRUE?
Answer» Which of the following statements is/are TRUE?

Discussion

12161.	The speed of body of mass 4 kg increases from 2 metre per second to 4 metre per second in certain time interval find the increase in kinetic energy a body
Answer» The speed of body of mass 4 kg increases from 2 metre per second to 4 metre per second in certain time interval find the increase in kinetic energy a body

Discussion

12162.	What is displacement? What is velocity? How are they related?
Answer» What is displacement? What is velocity? How are they related?

Discussion

12163.	If two people are pulling a box in the same direction with 85 N and 65 N force, the net displacement of the box is 18m. Find the net work done.
Answer» If two people are pulling a box in the same direction with 85 N and 65 N force, the net displacement of the box is 18m. Find the net work done.

Discussion

12164.	A constant force is required on the body for it to do circular motion. Justify the statement
Answer» A constant force is required on the body for it to do circular motion. Justify the statement

Discussion

12165.	what is contact force
Answer» what is contact force

Discussion

12166.	Action and reaction act on the (a) same body in opposite directions (b) different bodies in opposite directions (c) different bodies, but in same direction (d) same body in same direction.
Answer» Action and reaction act on the (a) same body in opposite directions (b) different bodies in opposite directions (c) different bodies, but in same direction (d) same body in same direction.

Discussion

12167.	The current flowing when a potential difference of 33 V is applied across an appliance having a resistance of 110 Ω is I. If the same current (I) is to flow through an appliance having a resistance of 500 Ω, how much potential difference should be applied across it?
Answer» The current flowing when a potential difference of $33 V$ is applied across an appliance having a resistance of $110 Ω$ is $I$ . If the same current $(I)$ is to flow through an appliance having a resistance of $500 Ω$ , how much potential difference should be applied across it?

Discussion

12168.	What are the constituent of a solar cell ? (Detailed)
Answer» What are the constituent of a solar cell ? (Detailed)

Discussion

12169.	Hi Can You Tell me The S.I Unit of 1.) Av Velocity 2.) Av Speed 3.) Acceleration
Answer» Hi Can You Tell me The S.I Unit of 1.) Av Velocity 2.) Av Speed 3.) Acceleration

12169.

Hi Can You Tell me The S.I Unit of 1.) Av Velocity 2.) Av Speed 3.) Acceleration

Answer»

Hi

Can You Tell me The

S.I Unit of

1.) Av Velocity

2.) Av Speed

3.) Acceleration

Discussion

12170.	car is moving in a circular path of radius 2m . Calculate both the distance and the magnitude of displacement the car after completing one revolution,2. One half revolution 3. One fourth revolution!union . What can you conclude about the relationship between the distance and displacement?
Answer» car is moving in a circular path of radius 2m . Calculate both the distance and the magnitude of displacement the car after completing one revolution,2. One half revolution 3. One fourth revolution!union . What can you conclude about the relationship between the distance and displacement?

Discussion

12171.	Newton called G an universal gravitational constant. But, in most of the whole universe, there is no gravitational force. GMm/r^2 = 0 or, GMm=0 but, Mm can never be zero. Since, mass of a body cannot be zero. Therefore, G=0 But, G = 6.67*10^-11. Thus, a contradiction is occurring. So, is G really an 'Universal constant'?
Answer» Newton called G an universal gravitational constant. But, in most of the whole universe, there is no gravitational force. GMm/r^2 = 0 or, GMm=0 but, Mm can never be zero. Since, mass of a body cannot be zero. Therefore, G=0 But, G = 6.67*10^-11. Thus, a contradiction is occurring. So, is G really an 'Universal constant'?

Discussion

12172.	The mass of a body on earth is 10 kg. Find its weight on a planet whose mass is twice the mass of the earth and radius of planet is twice the radius of the earth.
Answer» The mass of a body on earth is 10 kg. Find its weight on a planet whose mass is twice the mass of the earth and radius of planet is twice the radius of the earth.

Discussion

12173.	Give reasons : Steam is hotter than boiling water
Answer» Give reasons : Steam is hotter than boiling water

12173.

Give reasons : Steam is hotter than boiling water

Answer»

Give reasons :

Steam is hotter than boiling water

Discussion

12174.	Explain the example of the case of horse pulling a cart.
Answer» Explain the example of the case of horse pulling a cart.

Discussion

12175.	An optician while testing the eyes of a patient keeps a chart of letters 3 m behind the patient and asls him to see the letters on tje image of chart formed in a plane mirror kept at distance 2 m in front of him .At what distance is the chart seen by patient?
Answer» An optician while testing the eyes of a patient keeps a chart of letters 3 m behind the patient and asls him to see the letters on tje image of chart formed in a plane mirror kept at distance 2 m in front of him .At what distance is the chart seen by patient?

Discussion

12176.	A continuous disturbance is created on the surface of water in a ripple tank with a small piece of cork floating on it. Describe the motion of the cork . What does the motion of the cork tell about the disturbance?
Answer» A continuous disturbance is created on the surface of water in a ripple tank with a small piece of cork floating on it. Describe the motion of the cork . What does the motion of the cork tell about the disturbance?

Discussion

12177.	What name has been given to the force with which two objects lying apart attract each other ?
Answer» What name has been given to the force with which two objects lying apart attract each other ?

Discussion

12178.	Use the following information to answer the next question. The given figure shows a circuit with a resistor R connected to a cell of voltage V. Which statement is correct regarding the flow of charges through resistor R?
Answer» Use the following information to answer the next question. The given figure shows a circuit with a resistor R connected to a cell of voltage V. Which statement is correct regarding the flow of charges through resistor R?

12178.

Use the following information to answer the next question. The given figure shows a circuit with a resistor R connected to a cell of voltage V. Which statement is correct regarding the flow of charges through resistor R?

Answer»

Use the following information to answer the next question.

The given figure shows a circuit with a resistor R connected to a cell of voltage V.

Which statement is correct regarding the flow of charges through resistor R?

Discussion

12179.	A rifle bullet loses 1/ 20th of its velocity in passing through a plank. The least number of such planks required to just stop the bullet is?
Answer» A rifle bullet loses 1/ 20th of its velocity in passing through a plank. The least number of such planks required to just stop the bullet is?

Discussion

12180.	If a plane mirror is moved by a velocity 10 msec towards the object. Find out the velocity of the image and its direction?
Answer» If a plane mirror is moved by a velocity 10 $\frac{m}{s e c}$ towards the object. Find out the velocity of the image and its direction?

Discussion

12181.	A body is held immersed in a liquid. (i) Name the two forces acting on the body and draw a diagram to show these forces. (ii) State how do the magnitudes of two forces mentioned in part (i) determine whether the body will float or sink in the liquid when it is released. (iii) What is the net force on the body if it (a) sinks, (b) floats?
Answer» A body is held immersed in a liquid. (i) Name the two forces acting on the body and draw a diagram to show these forces. (ii) State how do the magnitudes of two forces mentioned in part (i) determine whether the body will float or sink in the liquid when it is released. (iii) What is the net force on the body if it (a) sinks, (b) floats?

12181.

A body is held immersed in a liquid. (i) Name the two forces acting on the body and draw a diagram to show these forces. (ii) State how do the magnitudes of two forces mentioned in part (i) determine whether the body will float or sink in the liquid when it is released. (iii) What is the net force on the body if it (a) sinks, (b) floats?

Answer»

A body is held immersed in a liquid.

(i) Name the two forces acting on the body and draw a diagram to show these forces.

(ii) State how do the magnitudes of two forces mentioned in part (i) determine whether the body will float or sink in the liquid when it is released.

(iii) What is the net force on the body if it (a) sinks, (b) floats?

Discussion

12182.	In a motor garage, a hydraulic lift is used to lift heavy automobiles such as trucks. The cross-sectional areas of the piston carrying the load and the piston where force is applied are in the ratio 5 : 3. The mass of a truck is 15000 kg. What is the magnitude of the force applied on the piston to just lift the truck?
Answer» In a motor garage, a hydraulic lift is used to lift heavy automobiles such as trucks. The cross-sectional areas of the piston carrying the load and the piston where force is applied are in the ratio 5 : 3. The mass of a truck is 15000 kg. What is the magnitude of the force applied on the piston to just lift the truck?

12182.

In a motor garage, a hydraulic lift is used to lift heavy automobiles such as trucks. The cross-sectional areas of the piston carrying the load and the piston where force is applied are in the ratio 5 : 3. The mass of a truck is 15000 kg. What is the magnitude of the force applied on the piston to just lift the truck?

Answer»

In a motor garage, a hydraulic lift is used to lift heavy automobiles such as trucks. The cross-sectional areas of the piston carrying the load and the piston where force is applied are in the ratio 5 : 3. The mass of a truck is 15000 kg.

What is the magnitude of the force applied on the piston to just lift the truck?

Discussion

12183.	Which of the following statements is correct? Statement 1: Mass of a body is defined as the quantity of matter contained in it. Statement 2: Mass of a body remains constant and does not change from place to place. Statement 3: Mass of a body cannot be zero. Statement 4: Unit of mass is kg.
Answer» Which of the following statements is correct? Statement 1: Mass of a body is defined as the quantity of matter contained in it. Statement 2: Mass of a body remains constant and does not change from place to place. Statement 3: Mass of a body cannot be zero. Statement 4: Unit of mass is kg.

Discussion

12184.	How does the density ρS of a substance determines whether a solid piece of that substance will float or sink in a given liquid of density ρL?
Answer» How does the density $ρ_{S}$ of a substance determines whether a solid piece of that substance will float or sink in a given liquid of density $ρ_{L}$ ?

Discussion

12185.	The pressure P1 at the top a dam and P2 at a depth h from the top inside water are related as:
Answer» The pressure P1 at the top a dam and P2 at a depth h from the top inside water are related as:

Discussion

12186.	A car goes at 24 m/s it passes through a bike at rest. As it passes, the bike starts up, acceleating at 3.2m/s2. If the bike can keep up that acceleration, how long will it take for it to catch the car?
Answer» A car goes at 24 m/s it passes through a bike at rest. As it passes, the bike starts up, acceleating at $3.2 m / s^{2}$ . If the bike can keep up that acceleration, how long will it take for it to catch the car?

Discussion

12187.	The time taken by two consecutive compressions or rarefactions to cross a fixed point is called__
Answer» The time taken by two consecutive compressions or rarefactions to cross a fixed point is called__

Discussion

12188.	Define the terms wavelength and amplitude with respect to wave motion? How do they affect the characteristics of sound?
Answer» Define the terms wavelength and amplitude with respect to wave motion? How do they affect the characteristics of sound?

Discussion

12189.	If mass and radius of earth is 6.0∗1024 kg and 6.4∗106 m respectively, calculate the force exerted by earth on a body of mass 1 kg. Also, calculate : (i) acceleration produced in the body of mass 1 kg, and (ii) acceleration produced in the earth
Answer» If mass and radius of earth is $6.0 * 10^{24}$ kg and $6.4 * 10^{6}$ m respectively, calculate the force exerted by earth on a body of mass 1 kg. Also, calculate : (i) acceleration produced in the body of mass 1 kg, and (ii) acceleration produced in the earth

Discussion

12190.	Name the form of energy which a body may possess even when it is not in motion.Give an example to support your answer.
Answer» Name the form of energy which a body may possess even when it is not in motion.Give an example to support your answer.

Discussion

12191.	Which of the following circuits correctly represents the connection of ammeter and voltmeter?
Answer» Which of the following circuits correctly represents the connection of ammeter and voltmeter?

Discussion

12192.	frequency of a sound wave is defined as
Answer» frequency of a sound wave is defined as

Discussion

12193.	What is centripetal and centrifugal ?
Answer» What is centripetal and centrifugal ?

Discussion

12194.	The weight of a body at a specific place is 20 N. The acceleration due to gravity at that point is 10 ms−2. What is the mass and weight of the object at the centre of Earth?
Answer» The weight of a body at a specific place is $20 N$ . The acceleration due to gravity at that point is $10 m s^{- 2}$ . What is the mass and weight of the object at the centre of Earth?

Discussion

12195.	How does the pressure exerted by a thrust depend on the area of the surface on which it acts? Explain with a suitable example.
Answer» How does the pressure exerted by a thrust depend on the area of the surface on which it acts? Explain with a suitable example.

Discussion

12196.	A sphere of iron and another of wood, both of same radius are placed on the surface of water. State which of the two will sink ? Give reason to your answer.
Answer» A sphere of iron and another of wood, both of same radius are placed on the surface of water. State which of the two will sink ? Give reason to your answer.

Discussion

12197.	Two resistors of resistance 2R and 3R are connected in series with a battery, which has an emf of E and an internal resistance R. What is the potential difference across the resistor of resistance 2R?
Answer» Two resistors of resistance 2R and 3R are connected in series with a battery, which has an emf of E and an internal resistance R. What is the potential difference across the resistor of resistance 2R?

12197.

Two resistors of resistance 2R and 3R are connected in series with a battery, which has an emf of E and an internal resistance R. What is the potential difference across the resistor of resistance 2R?

Answer»

Two resistors of resistance 2R and 3R are connected in series with a battery, which has an emf of E and an internal resistance R. What is the potential difference across the resistor of resistance 2R?

Discussion

12198.	How much momentum will a dumbbell of mass 10 kg transfer to the floor if it falls from a height of 80 cm (assume that the dumbbell stops after hitting the ground, g=10 ms−2)?
Answer» How much momentum will a dumbbell of mass $10 k g$ transfer to the floor if it falls from a height of $80 c m$ (assume that the dumbbell stops after hitting the ground, g= $10 m s^{- 2}$ )?

Discussion

12199.	State one use of a screw gauge.
Answer» State one use of a screw gauge.

Discussion

12200.	Which of the following radioactive radiations is similar to X-rays in nature?
Answer» Which of the following radioactive radiations is similar to X-rays in nature?

Discussion

Explore topic-wise InterviewSolutions in .

Why does a gas exert pressure on walls of the container?

In a lift, the apparent weight becomes twice the actual weight when

Find the amplitude of vibration of the particles of air through which a sound wave of intensity 2.0 × 10−6W m−2 and frequency 1.0 kHz is passing. Density of air =1.2 kgm−3and speed of sound in air =330ms−1

In order to catch a ball, a baseball player naturally moves his or her hand backward in the direction of the ball's motion once the ball contacts the hand. This habit causes the force of impact on the players hand to be reduced principally; because ___.

A body floats in a liquid with a part of it submerged inside the liquid then the weight of the floating body is?

Consider iron and water. In which of the given media does the sound travel faster?___

An object of mass 2 kg is sliding with a constant velocity of 4 ms−1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

It is easy to push an empty box than the same box full of books, because _____.

When light strikes the surface of a non-metallic material it bounces off in all directions due to ___.

Which of the following statements is/are TRUE?

The speed of body of mass 4 kg increases from 2 metre per second to 4 metre per second in certain time interval find the increase in kinetic energy a body

What is displacement? What is velocity? How are they related?

If two people are pulling a box in the same direction with 85 N and 65 N force, the net displacement of the box is 18m. Find the net work done.

A constant force is required on the body for it to do circular motion. Justify the statement

what is contact force

Action and reaction act on the (a) same body in opposite directions (b) different bodies in opposite directions (c) different bodies, but in same direction (d) same body in same direction.

The current flowing when a potential difference of 33 V is applied across an appliance having a resistance of 110 Ω is I. If the same current (I) is to flow through an appliance having a resistance of 500 Ω, how much potential difference should be applied across it?

What are the constituent of a solar cell ? (Detailed)

Hi Can You Tell me The S.I Unit of 1.) Av Velocity 2.) Av Speed 3.) Acceleration

car is moving in a circular path of radius 2m . Calculate both the distance and the magnitude of displacement the car after completing one revolution,2. One half revolution 3. One fourth revolution!union . What can you conclude about the relationship between the distance and displacement?

The mass of a body on earth is 10 kg. Find its weight on a planet whose mass is twice the mass of the earth and radius of planet is twice the radius of the earth.

Give reasons : Steam is hotter than boiling water

Explain the example of the case of horse pulling a cart.

An optician while testing the eyes of a patient keeps a chart of letters 3 m behind the patient and asls him to see the letters on tje image of chart formed in a plane mirror kept at distance 2 m in front of him .At what distance is the chart seen by patient?

A continuous disturbance is created on the surface of water in a ripple tank with a small piece of cork floating on it. Describe the motion of the cork . What does the motion of the cork tell about the disturbance?

What name has been given to the force with which two objects lying apart attract each other ?

Use the following information to answer the next question. The given figure shows a circuit with a resistor R connected to a cell of voltage V. Which statement is correct regarding the flow of charges through resistor R?

A rifle bullet loses 1/ 20th of its velocity in passing through a plank. The least number of such planks required to just stop the bullet is?

If a plane mirror is moved by a velocity 10 msec towards the object. Find out the velocity of the image and its direction?

Which of the following statements is correct? Statement 1: Mass of a body is defined as the quantity of matter contained in it. Statement 2: Mass of a body remains constant and does not change from place to place. Statement 3: Mass of a body cannot be zero. Statement 4: Unit of mass is kg.

How does the density ρS of a substance determines whether a solid piece of that substance will float or sink in a given liquid of density ρL?

The pressure P1 at the top a dam and P2 at a depth h from the top inside water are related as:

A car goes at 24 m/s it passes through a bike at rest. As it passes, the bike starts up, acceleating at 3.2m/s2. If the bike can keep up that acceleration, how long will it take for it to catch the car?

The time taken by two consecutive compressions or rarefactions to cross a fixed point is called__

Define the terms wavelength and amplitude with respect to wave motion? How do they affect the characteristics of sound?

If mass and radius of earth is 6.0∗1024 kg and 6.4∗106 m respectively, calculate the force exerted by earth on a body of mass 1 kg. Also, calculate : (i) acceleration produced in the body of mass 1 kg, and (ii) acceleration produced in the earth

Name the form of energy which a body may possess even when it is not in motion.Give an example to support your answer.

Which of the following circuits correctly represents the connection of ammeter and voltmeter?

frequency of a sound wave is defined as

What is centripetal and centrifugal ?

The weight of a body at a specific place is 20 N. The acceleration due to gravity at that point is 10 ms−2. What is the mass and weight of the object at the centre of Earth?

How does the pressure exerted by a thrust depend on the area of the surface on which it acts? Explain with a suitable example.

A sphere of iron and another of wood, both of same radius are placed on the surface of water. State which of the two will sink ? Give reason to your answer.

Two resistors of resistance 2R and 3R are connected in series with a battery, which has an emf of E and an internal resistance R. What is the potential difference across the resistor of resistance 2R?

How much momentum will a dumbbell of mass 10 kg transfer to the floor if it falls from a height of 80 cm (assume that the dumbbell stops after hitting the ground, g=10 ms−2)?

State one use of a screw gauge.

Which of the following radioactive radiations is similar to X-rays in nature?