9478 + Interview Questions in Physics Page 121 InterviewSolution

6001.	Why sound cannot travel through the vacuum (or through outer space)?
Answer» Why sound cannot travel through the vacuum (or through outer space)?

Discussion

6002.	Explain the working of a periscope.
Answer» Explain the working of a periscope.

Discussion

6003.	Rays parallel to the principal axis of a concave or convex mirror meet or appear to come from which point?
Answer» Rays parallel to the principal axis of a concave or convex mirror meet or appear to come from which point?

Discussion

6004.	Explain why a wide steel belt is provided over the wheels of an army tank.
Answer» Explain why a wide steel belt is provided over the wheels of an army tank.

Discussion

6005.	Which of the following statement is correct when two bodies with different temperature and heat content are connected through a metal wire?
Answer» Which of the following statement is correct when two bodies with different temperature and heat content are connected through a metal wire?

Discussion

6006.	To overcome or minimize air fluid friction the bodies are given special shapes. Which of the following shape helps to reduce air drag?
Answer» To overcome or minimize air fluid friction the bodies are given special shapes. Which of the following shape helps to reduce air drag?

Discussion

6007.	Which of the following are forms of mechanical energy?
Answer» Which of the following are forms of mechanical energy?

Discussion

6008.	When a ball is thrown vertically upwards it falls down ultimately. What force pulls the ball downwards?
Answer» When a ball is thrown vertically upwards it falls down ultimately. What force pulls the ball downwards?

Discussion

6009.	If √2 =1.4142,then find the value of ✓√2-1÷√2+1.
Answer» If √2 =1.4142,then find the value of ✓√2-1÷√2+1.

Discussion

6010.	When static, sliding and rolling frictional forces are to be arranged in an increasing order, which one of the following options would be correct?
Answer» When static, sliding and rolling frictional forces are to be arranged in an increasing order, which one of the following options would be correct?

Discussion

6011.	What happens when you rub your hands vigorously for a few seconds ? Why does this happen ?
Answer» What happens when you rub your hands vigorously for a few seconds ? Why does this happen ?

Discussion

6012.	Tick the correct answer in the following and justify your choice: If the perimeter and the area of a circle are numerically equal, then the radius of the circle is: 1. 2 units 2. 3 units 3. 4 units 4. 7 units
Answer» Tick the correct answer in the following and justify your choice: If the perimeter and the area of a circle are numerically equal, then the radius of the circle is: 1. 2 units 2. 3 units 3. 4 units 4. 7 units

Discussion

6013.	Which of the below materials uses a permanent magnet?
Answer» Which of the below materials uses a permanent magnet?

Discussion

6014.	Which of the following is not an example of muscular force ? (a) a porter carrying a load on a wheel-barrow. (b) an apple falling from a tree. (c) a child riding a bicycle. (d) a person drawing water from a well.
Answer» Which of the following is not an example of muscular force ? (a) a porter carrying a load on a wheel-barrow. (b) an apple falling from a tree. (c) a child riding a bicycle. (d) a person drawing water from a well.

Discussion

6015.	Statement 1: Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap. Statement 2: Velocity of sound in air is 330 m/s and time of persistence for hearing is 110 of a second.
Answer» Statement 1: Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap. Statement 2: Velocity of sound in air is 330 m/s and time of persistence for hearing is $\frac{1}{10}$ of a second.

Discussion

6016.	The displacement-distance graph for a particle in a wave is shown below. Then the value of 'R' is ___ , if, (2λ + R is 3 times the amplitude of the wave)
Answer» The displacement-distance graph for a particle in a wave is shown below. Then the value of 'R' is ___ , if, $(2 λ + R i s 3 t i m e s t h e a m p l i t u d e o f t h e w a v e)$

6016.

The displacement-distance graph for a particle in a wave is shown below. Then the value of 'R' is ___ , if, (2λ + R is 3 times the amplitude of the wave)

Answer»

The displacement-distance graph for a particle in a wave is shown below. Then the value of 'R' is ___ , if,

$(2 λ + R i s 3 t i m e s t h e a m p l i t u d e o f t h e w a v e)$

Discussion

6017.	Velocity of sound in air is :
Answer» Velocity of sound in air is :

Discussion

6018.	Sound can be painful to hear, and causes ear damage, when its loudness exceeds ________.
Answer» Sound can be painful to hear, and causes ear damage, when its loudness exceeds ________.

Discussion

6019.	When a tube-light rated 220V, 60W is connected across a potential of 220V for 22 sec then find the charge flowing in it.
Answer» When a tube-light rated 220V, 60W is connected across a potential of 220V for 22 sec then find the charge flowing in it.

Discussion

6020.	Why is friction considered a necessary evil
Answer» Why is friction considered a necessary evil

Discussion

6021.	Why don't a burning matchstick shows a shadow on a screen.?
Answer» Why don't a burning matchstick shows a shadow on a screen.?

Discussion

6022.	Can friction be totally eliminated ? Give reasons
Answer» Can friction be totally eliminated ? Give reasons

Discussion

6023.	What is the best thing to do during heavy lightning?
Answer» What is the best thing to do during heavy lightning?

Discussion

6024.	How is a star born ?
Answer» How is a star born ?

Discussion

6025.	State the various uses of a periscope.
Answer» State the various uses of a periscope.

Discussion

6026.	A 3.0 kg object is moving across a friction-free surface with a constant velocity of 2 m/s. Which one of the following horizontal forces is necessary to maintain this state of motion?
Answer» A 3.0 kg object is moving across a friction-free surface with a constant velocity of 2 m/s. Which one of the following horizontal forces is necessary to maintain this state of motion?

Discussion

6027.	Current flowing in an electric circuit is inversely proportional to the resistance when potential difference is fixed. In an experiment, it is observed that a current of 200 mA flows when resistance of circuit is 30 Ohm. Find the resistance when current flowing is 350 mA
Answer» Current flowing in an electric circuit is inversely proportional to the resistance when potential difference is fixed. In an experiment, it is observed that a current of 200 mA flows when resistance of circuit is 30 Ohm. Find the resistance when current flowing is 350 mA

Discussion

6028.	Why does the Sun appear to be bigger and brighter than all other stars?
Answer» Why does the Sun appear to be bigger and brighter than all other stars?

Discussion

6029.	Sound travels fastest in which medium?
Answer» Sound travels fastest in which medium?

Discussion

6030.	The planets which are found outside the orbit of Mars are known as___.
Answer» The planets which are found outside the orbit of Mars are known as___.

Discussion

6031.	Name the quantity that does not change as a body moves.
Answer» Name the quantity that does not change as a body moves.

Discussion

6032.	The S.I. unit of intensity is
Answer» The S.I. unit of intensity is

Discussion

6033.	What is a comet? Name the comet which was last seen in 1986 after a period of 76 years.
Answer» What is a comet? Name the comet which was last seen in 1986 after a period of 76 years.

Discussion

6034.	___ is the physical quantity, which is the measure of inertia.
Answer» ___ is the physical quantity, which is the measure of inertia.

Discussion

6035.	I took a laser and a normal torch. I shot them . The laser beam was shot at a far distance while the normal torch didn't. Why it is so?
Answer» I took a laser and a normal torch. I shot them . The laser beam was shot at a far distance while the normal torch didn't. Why it is so?

Discussion

6036.	An object is placed at the centre of curvature of a concave mirror. The focal length of the mirror is 20cm. A plane mirror is placed on the left of the object as shown in the figure. Considering the image formed by the plane mirror as the object for the concave mirror, where will the new image be formed?
Answer» An object is placed at the centre of curvature of a concave mirror. The focal length of the mirror is 20cm. A plane mirror is placed on the left of the object as shown in the figure. Considering the image formed by the plane mirror as the object for the concave mirror, where will the new image be formed?

6036.

An object is placed at the centre of curvature of a concave mirror. The focal length of the mirror is 20cm. A plane mirror is placed on the left of the object as shown in the figure. Considering the image formed by the plane mirror as the object for the concave mirror, where will the new image be formed?

Answer»

An object is placed at the centre of curvature of a concave mirror. The focal length of the mirror is 20cm. A plane mirror is placed on the left of the object as shown in the figure. Considering the image formed by the plane mirror as the object for the concave mirror, where will the new image be formed?

Discussion

6037.	Question 06.3 Fill in the blanks in the following. The size of the pupil becomes ________ when you see in dim light.
Answer» Question 06.3 Fill in the blanks in the following. The size of the pupil becomes ________ when you see in dim light.

Discussion

6038.	If white light passes through prism,we will see a spectrum. What will happen if a red or blue light will fall on a prism
Answer» If white light passes through prism,we will see a spectrum. What will happen if a red or blue light will fall on a prism

Discussion

6039.	When the nozzle of a syringe is dipped in a liquid and its piston is withdrawn, the pressure inside the syringe is
Answer» When the nozzle of a syringe is dipped in a liquid and its piston is withdrawn, the pressure inside the syringe is

Discussion

6040.	Question 3(b) State whether the following statement is true or false. A charged glass rod attracts a charged plastic straw.
Answer» Question 3(b) State whether the following statement is true or false. A charged glass rod attracts a charged plastic straw.

6040.

Question 3(b) State whether the following statement is true or false. A charged glass rod attracts a charged plastic straw.

Answer»

Question 3(b)

State whether the following statement is true or false.
A charged glass rod attracts a charged plastic straw.

Discussion

6041.	What happens when a metal is heated?
Answer» What happens when a metal is heated?

Discussion

6042.	As per Lenovo Alexa the boiling point of hydrogen is 20.3K but in the school textbook it is written 20.4K . Which one is correct?
Answer» As per Lenovo Alexa the boiling point of hydrogen is 20.3K but in the school textbook it is written 20.4K . Which one is correct?

Discussion

6043.	What do you call a huge exploding star that ejects most of its mass
Answer» What do you call a huge exploding star that ejects most of its mass

Discussion

6044.	Explain about Neptune.
Answer» Explain about Neptune.

Discussion

6045.	The anion which discharges at anode with great difficulty is __________ ions.
Answer» The anion which discharges at anode with great difficulty is __________ ions.

Discussion

6046.	Why is it difficult to walk on a wet marble floor?
Answer» Why is it difficult to walk on a wet marble floor?

Discussion

6047.	Which of the following does not work on the existence of atmospheric pressure ? (a) rise of iodine solution in the glass tube of dropper (b) rise of cold drink in a long plastic straw (c) sticking of suction hook on the wall of a room (d) rise of mercury in glass tube of thermometer
Answer» Which of the following does not work on the existence of atmospheric pressure ? (a) rise of iodine solution in the glass tube of dropper (b) rise of cold drink in a long plastic straw (c) sticking of suction hook on the wall of a room (d) rise of mercury in glass tube of thermometer

Discussion

6048.	Ramses then continued that a star doesn’t have a defined way to follow or defined number of position changes. Today it changes its position in one way and the other day it would take some other way and change the position. What can you infer about the position (value) a star (variable) takes?
Answer» Ramses then continued that a star doesn’t have a defined way to follow or defined number of position changes. Today it changes its position in one way and the other day it would take some other way and change the position. What can you infer about the position (value) a star (variable) takes?

6048.

Ramses then continued that a star doesn’t have a defined way to follow or defined number of position changes. Today it changes its position in one way and the other day it would take some other way and change the position. What can you infer about the position (value) a star (variable) takes?

Answer»

Ramses then continued that a star doesn’t have a defined way to follow or defined number of position changes. Today it changes its position in one way and the other day it would take some other way and change the position.

What can you infer about the position (value) a star (variable) takes?

Discussion

6049.	Why does sound get reflect only after a certain distance ?that is 17m this point are also called eco point . Why does eco (sound reflect)after 17m? Not in short distance?
Answer» Why does sound get reflect only after a certain distance ?that is 17m this point are also called eco point . Why does eco (sound reflect)after 17m? Not in short distance?

6049.

Why does sound get reflect only after a certain distance ?that is 17m this point are also called eco point . Why does eco (sound reflect)after 17m? Not in short distance?

Answer»

Why does sound get reflect only after a certain distance ?that is 17m this point are also called eco point .

Why does eco (sound reflect)after 17m? Not in short distance?

Discussion

6050.	Three masses 5 kg, 4 kg and 7 kg are aligned in a straight line as shown below. Find the net gravitational force on 4 kg.
Answer» Three masses 5 kg, 4 kg and 7 kg are aligned in a straight line as shown below. Find the net gravitational force on 4 kg.

Discussion

Explore topic-wise InterviewSolutions in .

Why sound cannot travel through the vacuum (or through outer space)?

Explain the working of a periscope.

Rays parallel to the principal axis of a concave or convex mirror meet or appear to come from which point?

Explain why a wide steel belt is provided over the wheels of an army tank.

Which of the following statement is correct when two bodies with different temperature and heat content are connected through a metal wire?

To overcome or minimize air fluid friction the bodies are given special shapes. Which of the following shape helps to reduce air drag?

Which of the following are forms of mechanical energy?

When a ball is thrown vertically upwards it falls down ultimately. What force pulls the ball downwards?

If √2 =1.4142,then find the value of ✓√2-1÷√2+1.

When static, sliding and rolling frictional forces are to be arranged in an increasing order, which one of the following options would be correct?

What happens when you rub your hands vigorously for a few seconds ? Why does this happen ?

Tick the correct answer in the following and justify your choice: If the perimeter and the area of a circle are numerically equal, then the radius of the circle is: 1. 2 units 2. 3 units 3. 4 units 4. 7 units

Which of the below materials uses a permanent magnet?

Which of the following is not an example of muscular force ? (a) a porter carrying a load on a wheel-barrow. (b) an apple falling from a tree. (c) a child riding a bicycle. (d) a person drawing water from a well.

Statement 1: Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap. Statement 2: Velocity of sound in air is 330 m/s and time of persistence for hearing is 110 of a second.

The displacement-distance graph for a particle in a wave is shown below. Then the value of 'R' is ___ , if, (2λ + R is 3 times the amplitude of the wave)

Velocity of sound in air is :

Sound can be painful to hear, and causes ear damage, when its loudness exceeds ________.

When a tube-light rated 220V, 60W is connected across a potential of 220V for 22 sec then find the charge flowing in it.

Why is friction considered a necessary evil

Why don't a burning matchstick shows a shadow on a screen.?

Can friction be totally eliminated ? Give reasons

What is the best thing to do during heavy lightning?

How is a star born ?

State the various uses of a periscope.

A 3.0 kg object is moving across a friction-free surface with a constant velocity of 2 m/s. Which one of the following horizontal forces is necessary to maintain this state of motion?

Current flowing in an electric circuit is inversely proportional to the resistance when potential difference is fixed. In an experiment, it is observed that a current of 200 mA flows when resistance of circuit is 30 Ohm. Find the resistance when current flowing is 350 mA

Why does the Sun appear to be bigger and brighter than all other stars?

Sound travels fastest in which medium?

The planets which are found outside the orbit of Mars are known as___.

Name the quantity that does not change as a body moves.

The S.I. unit of intensity is

What is a comet? Name the comet which was last seen in 1986 after a period of 76 years.

___ is the physical quantity, which is the measure of inertia.

I took a laser and a normal torch. I shot them . The laser beam was shot at a far distance while the normal torch didn't. Why it is so?

Question 06.3 Fill in the blanks in the following. The size of the pupil becomes ________ when you see in dim light.

If white light passes through prism,we will see a spectrum. What will happen if a red or blue light will fall on a prism

When the nozzle of a syringe is dipped in a liquid and its piston is withdrawn, the pressure inside the syringe is

Question 3(b) State whether the following statement is true or false. A charged glass rod attracts a charged plastic straw.

What happens when a metal is heated?

As per Lenovo Alexa the boiling point of hydrogen is 20.3K but in the school textbook it is written 20.4K . Which one is correct?

What do you call a huge exploding star that ejects most of its mass

Explain about Neptune.

The anion which discharges at anode with great difficulty is __________ ions.

Why is it difficult to walk on a wet marble floor?

Which of the following does not work on the existence of atmospheric pressure ? (a) rise of iodine solution in the glass tube of dropper (b) rise of cold drink in a long plastic straw (c) sticking of suction hook on the wall of a room (d) rise of mercury in glass tube of thermometer

Ramses then continued that a star doesn’t have a defined way to follow or defined number of position changes. Today it changes its position in one way and the other day it would take some other way and change the position. What can you infer about the position (value) a star (variable) takes?

Why does sound get reflect only after a certain distance ?that is 17m this point are also called eco point . Why does eco (sound reflect)after 17m? Not in short distance?

Three masses 5 kg, 4 kg and 7 kg are aligned in a straight line as shown below. Find the net gravitational force on 4 kg.