9478 + Interview Questions in Physics Page 154 InterviewSolution

7651.	What kind of force causes a change in motion?
Answer» What kind of force causes a change in motion?

Discussion

7652.	Does gravitational force exist between two people standing on earth? If yes,why?
Answer» Does gravitational force exist between two people standing on earth? If yes,why?

Discussion

7653.	Explain why, sportsmen use shoes with spikes.
Answer» Explain why, sportsmen use shoes with spikes.

Discussion

7654.	Question 1 In which of these mediums can sound travel? (i) Wood (ii) Water (iii) Air (iv) Vacuum
Answer» Question 1 In which of these mediums can sound travel? (i) Wood (ii) Water (iii) Air (iv) Vacuum

Discussion

7655.	Question 11 (iv) State whether the following statements are True/False. The process of electric discharge cannot occur between clouds and the earth.
Answer» Question 11 (iv) State whether the following statements are True/False. The process of electric discharge cannot occur between clouds and the earth.

7655.

Question 11 (iv) State whether the following statements are True/False. The process of electric discharge cannot occur between clouds and the earth.

Answer»

Question 11 (iv)

State whether the following statements are True/False.
The process of electric discharge cannot occur between clouds and the earth.

Discussion

7656.	Amount of mass in a given volume is known as ___.
Answer» Amount of mass in a given volume is known as ___.

Discussion

7657.	The rock that attracts metals is termed as
Answer» The rock that attracts metals is termed as

Discussion

7658.	It is easier for a person to swim in sea water than in river water. The reason is that:
Answer» It is easier for a person to swim in sea water than in river water. The reason is that:

Discussion

7659.	Write the full form of M.C.B.
Answer» Write the full form of M.C.B.

Discussion

7660.	What is the caise of lateral inversion?
Answer» What is the caise of lateral inversion?

Discussion

7661.	When a glass rod is rubbed with silk the free electrons of glass rod are transferred to silk. But glass is a insulator and insulators do not have free electrons. So how did free electrons from glass rod get transferred to silk if glass rod doesn’t even have free electrons
Answer» When a glass rod is rubbed with silk the free electrons of glass rod are transferred to silk. But glass is a insulator and insulators do not have free electrons. So how did free electrons from glass rod get transferred to silk if glass rod doesn’t even have free electrons

Discussion

7662.	There is no flow of current between two charged bodies when connected because (a) They have same quantity of charge (b) They have same potential (c) They have same capacity (d) They have the same ratio of potential per unit charge
Answer» There is no flow of current between two charged bodies when connected because (a) They have same quantity of charge (b) They have same potential (c) They have same capacity (d) They have the same ratio of potential per unit charge

Discussion

7663.	Does gravity on first layer of water is same as the bottom layer?
Answer» Does gravity on first layer of water is same as the bottom layer?

Discussion

7664.	Why does geostationary satellites always have to be on the equator??
Answer» Why does geostationary satellites always have to be on the equator??

Discussion

7665.	How do our eyes perceive that the colour of banana is yellow?
Answer» How do our eyes perceive that the colour of banana is yellow?

Discussion

7666.	Is it possible to boil water at zero degree celsius?
Answer» Is it possible to boil water at zero degree celsius?

Discussion

7667.	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 thrust(force acting normally to the surface) 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 thrust(force acting normally to the surface) per unit area.

Discussion

7668.	State one observation from everyday life which shows that sound travels much more slower than light.
Answer» State one observation from everyday life which shows that sound travels much more slower than light.

Discussion

7669.	How will our Earth look when seen from a space - ship or Moon?
Answer» How will our Earth look when seen from a space - ship or Moon?

Discussion

7670.	Density of the largest planet of the solar system is:
Answer» Density of the largest planet of the solar system is:

Discussion

7671.	Where is larynx located?
Answer» Where is larynx located?

Discussion

7672.	Which of the following has lost more electrons?
Answer» Which of the following has lost more electrons?

Discussion

7673.	What are gross errors? Explain with its cause.
Answer» What are gross errors? Explain with its cause.

Discussion

7674.	Why a loud sound is produced when we brust the balloon?
Answer» Why a loud sound is produced when we brust the balloon?

Discussion

7675.	Change the sentence to the active voice. Such a beautiful sight had never been seen by Jaya before.
Answer» Change the sentence to the active voice. Such a beautiful sight had never been seen by Jaya before.

7675.

Change the sentence to the active voice. Such a beautiful sight had never been seen by Jaya before.

Answer»

Change the sentence to the active voice.

Such a beautiful sight had never been seen by Jaya before.

Discussion

7676.	In a jar, kerosene is floating on water. Which of the following options is correct?
Answer» In a jar, kerosene is floating on water. Which of the following options is correct?

Discussion

7677.	Name the first artificial satellite launched by India.
Answer» Name the first artificial satellite launched by India.

Discussion

7678.	The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea ? (a) 15,000 Hz (b) 10 kHz (c) 50 kHz (4) 10,000 Hz
Answer» The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea ? (a) 15,000 Hz (b) 10 kHz (c) 50 kHz (4) 10,000 Hz

7678.

The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea ? (a) 15,000 Hz (b) 10 kHz (c) 50 kHz (4) 10,000 Hz

Answer»

The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea ?

(a) 15,000 Hz (b) 10 kHz (c) 50 kHz (4) 10,000 Hz

Discussion

7679.	Which of the following might have been used by early age navigators and explorers to determine direction?
Answer» Which of the following might have been used by early age navigators and explorers to determine direction?

Discussion

7680.	It is easier to cut with a sharp knife than with a blunt one. Explain.
Answer» It is easier to cut with a sharp knife than with a blunt one. Explain.

Discussion

7681.	A book placed on a desk is pushed towards the right. In which direction will the force of friction act on the book?
Answer» A book placed on a desk is pushed towards the right. In which direction will the force of friction act on the book?

Discussion

7682.	A force of 18 N is distributed uniformly on one surface of a cube of edge 6 cm. The pressure on this surface is
Answer» A force of 18 N is distributed uniformly on one surface of a cube of edge 6 cm. The pressure on this surface is

7682.

A force of 18 N is distributed uniformly on one surface of a cube of edge 6 cm. The pressure on this surface is

Answer»

A force of 18 N is distributed uniformly on one surface of a cube of edge 6 cm. The pressure on this surface is

Discussion

7683.	Sort the following in the correct order of power transmission to a household:
Answer» Sort the following in the correct order of power transmission to a household:

Discussion

7684.	Why is a machine not 100% efficient?
Answer» Why is a machine not 100% efficient?

Discussion

7685.	We know that the pressure inside our body cancels the atmospheric pressure.But if the pressure exerted by our body increases and what will happen.
Answer» We know that the pressure inside our body cancels the atmospheric pressure.But if the pressure exerted by our body increases and what will happen.

Discussion

7686.	Refraction
Answer» Refraction

Discussion

7687.	A light ray is incident on a mirror such that it makes it makes 30∘ with the surface of the mirror. Find the angle of reflection. [2 MARKS]
Answer» A light ray is incident on a mirror such that it makes it makes $30^{\circ}$ with the surface of the mirror. Find the angle of reflection. [2 MARKS]

Discussion

7688.	What causes friction between two surfaces in contact when they try to slide past each other?
Answer» What causes friction between two surfaces in contact when they try to slide past each other?

Discussion

7689.	In the given mirror C – centre of the sphere to which the mirror is part of F – focus of the mirror P – pole of the mirror A – point on the mirror D – point on the principal axis. If a ray of light starts from C and is incident on A from which point will the reflected ray pass through?
Answer» In the given mirror C – centre of the sphere to which the mirror is part of F – focus of the mirror P – pole of the mirror A – point on the mirror D – point on the principal axis. If a ray of light starts from C and is incident on A from which point will the reflected ray pass through?

7689.

In the given mirror C – centre of the sphere to which the mirror is part of F – focus of the mirror P – pole of the mirror A – point on the mirror D – point on the principal axis. If a ray of light starts from C and is incident on A from which point will the reflected ray pass through?

Answer»

In the given mirror

C – centre of the sphere to which the mirror is part of

F – focus of the mirror

P – pole of the mirror

A – point on the mirror

D – point on the principal axis.

If a ray of light starts from C and is incident on A from which point will the reflected ray pass through?

Discussion

7690.	In electrolysis process, the chemical change is caused due to ___ energy.
Answer» In electrolysis process, the chemical change is caused due to ___ energy.

Discussion

7691.	(a) Name three types of substances in which an electric current can produce a chemical effect. (b) State some of the characteristics of chemical changes brought about by the chemical effect of electric current. (c) Why does an electric bulb glow when a current passes through it ?
Answer» (a) Name three types of substances in which an electric current can produce a chemical effect. (b) State some of the characteristics of chemical changes brought about by the chemical effect of electric current. (c) Why does an electric bulb glow when a current passes through it ?

Discussion

7692.	Write true or false for each statement: (a) The number of electrons and protons in an atom are same. (b) If the charge is not in motion, we call it static electricity. (c) Human body is a conductor of electricity. (d) When an ebonite rod is rubbed with fur, the electrons move from ebonite to fur. (e) When a glass rod is rubbed with the dry silk cloth, the electrons move from glass to silk. (f) The cap of gold leaf electroscope is made of copper. (g) If a glass rod rubbed with silk is brought near the cap of a negatively charged electroscope, the divergence of leaves will decrease. (h) In induction, a positively charged body can make an uncharged body positively charged. (i) A lighting conductor saves the building from lighting. (j) When a comb is rubbed with dry hair both comb and paper get similarly charged. (k) A glass rod rubbed with silk repels an ebonite rod rubbed with fur. (l) When an ebonite rod is rubbed with fur, the protons move from the ebonite rod to the fur. (m) A conductor has a large number of free electrons. (n) An ebonite rod can be charged by touching it with a charged copper rod. (o) To find whether a body is charged or not, an uncharged electroscope is used. (p) To find whether the charge on a body is positive or negative, an uncharged electroscope is used. (q) If a negatively charged rod is brought near a negatively charged pith ball electroscope, the pith ball will be stuck with the rod.
Answer» Write true or false for each statement: (a) The number of electrons and protons in an atom are same. (b) If the charge is not in motion, we call it static electricity. (c) Human body is a conductor of electricity. (d) When an ebonite rod is rubbed with fur, the electrons move from ebonite to fur. (e) When a glass rod is rubbed with the dry silk cloth, the electrons move from glass to silk. (f) The cap of gold leaf electroscope is made of copper. (g) If a glass rod rubbed with silk is brought near the cap of a negatively charged electroscope, the divergence of leaves will decrease. (h) In induction, a positively charged body can make an uncharged body positively charged. (i) A lighting conductor saves the building from lighting. (j) When a comb is rubbed with dry hair both comb and paper get similarly charged. (k) A glass rod rubbed with silk repels an ebonite rod rubbed with fur. (l) When an ebonite rod is rubbed with fur, the protons move from the ebonite rod to the fur. (m) A conductor has a large number of free electrons. (n) An ebonite rod can be charged by touching it with a charged copper rod. (o) To find whether a body is charged or not, an uncharged electroscope is used. (p) To find whether the charge on a body is positive or negative, an uncharged electroscope is used. (q) If a negatively charged rod is brought near a negatively charged pith ball electroscope, the pith ball will be stuck with the rod.

7692.

Write true or false for each statement: (a) The number of electrons and protons in an atom are same. (b) If the charge is not in motion, we call it static electricity. (c) Human body is a conductor of electricity. (d) When an ebonite rod is rubbed with fur, the electrons move from ebonite to fur. (e) When a glass rod is rubbed with the dry silk cloth, the electrons move from glass to silk. (f) The cap of gold leaf electroscope is made of copper. (g) If a glass rod rubbed with silk is brought near the cap of a negatively charged electroscope, the divergence of leaves will decrease. (h) In induction, a positively charged body can make an uncharged body positively charged. (i) A lighting conductor saves the building from lighting. (j) When a comb is rubbed with dry hair both comb and paper get similarly charged. (k) A glass rod rubbed with silk repels an ebonite rod rubbed with fur. (l) When an ebonite rod is rubbed with fur, the protons move from the ebonite rod to the fur. (m) A conductor has a large number of free electrons. (n) An ebonite rod can be charged by touching it with a charged copper rod. (o) To find whether a body is charged or not, an uncharged electroscope is used. (p) To find whether the charge on a body is positive or negative, an uncharged electroscope is used. (q) If a negatively charged rod is brought near a negatively charged pith ball electroscope, the pith ball will be stuck with the rod.

Answer»

Write true or false for each statement:

(a) The number of electrons and protons in an atom are same.

(b) If the charge is not in motion, we call it static electricity.

(c) Human body is a conductor of electricity.

(d) When an ebonite rod is rubbed with fur, the electrons move from ebonite to fur.

(e) When a glass rod is rubbed with the dry silk cloth, the electrons move from glass to silk.

(f) The cap of gold leaf electroscope is made of copper.

(g) If a glass rod rubbed with silk is brought near the cap of a negatively charged electroscope, the divergence of leaves will decrease.

(h) In induction, a positively charged body can make an uncharged body positively charged.

(i) A lighting conductor saves the building from lighting.

(j) When a comb is rubbed with dry hair both comb and paper get similarly charged.

(k) A glass rod rubbed with silk repels an ebonite rod rubbed with fur.

(l) When an ebonite rod is rubbed with fur, the protons move from the ebonite rod to the fur.

(m) A conductor has a large number of free electrons.

(n) An ebonite rod can be charged by touching it with a charged copper rod.

(o) To find whether a body is charged or not, an uncharged electroscope is used.

(p) To find whether the charge on a body is positive or negative, an uncharged electroscope is used.

(q) If a negatively charged rod is brought near a negatively charged pith ball electroscope, the pith ball will be stuck with the rod.

Discussion

7693.	Does speed of sound varies with temperature
Answer» Does speed of sound varies with temperature

Discussion

7694.	The molten material mixed with gases in the mantle of the earth is called ______.
Answer» The molten material mixed with gases in the mantle of the earth is called ______.

Discussion

7695.	During the installation of an electric circuit in the house, why do we use body earthing?
Answer» During the installation of an electric circuit in the house, why do we use body earthing?

Discussion

7696.	What is/are the basic component(s) of a hearing aid?
Answer» What is/are the basic component(s) of a hearing aid?

Discussion

7697.	What is the direction of frictional force acting between two bodies moving one over another?
Answer» What is the direction of frictional force acting between two bodies moving one over another?

Discussion

7698.	Write True or false for each statement : (a) Water is optically denser than glass. (b) A ray of light when passes from glass to air, bends towards the normal. (c) The speed of light is more in glass than in water. (d) The depth of a pond when seen from above appears to be less. (e) Light travels at a lower speed in water than in air. (f) Light travels in the same straight line path while passing through different media. (g) The angle formed between the normal and the refracted ray is known as the angle of incidence. (h) At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal. (i) Image is formed by a mirror due to refraction of light. (j) Rays of light incident parallel to the principal axis pass through the focus after reflection from a concave mirror. (k) A convex mirror is used as a shaving mirror. (l) The focal length of a convex mirror is equal to its adius of curvature. (m) A concave mirror converges the light rays, but a convex mirror diverges them. (n) A virtual image formed by a spherical mirror is always erect and situated behind the mirror. Ans. True - (d), (e), (h), (j), (m), (n), False - (a), (b), (c), (f), (g), (i), (k), (l)
Answer» Write True or false for each statement : (a) Water is optically denser than glass. (b) A ray of light when passes from glass to air, bends towards the normal. (c) The speed of light is more in glass than in water. (d) The depth of a pond when seen from above appears to be less. (e) Light travels at a lower speed in water than in air. (f) Light travels in the same straight line path while passing through different media. (g) The angle formed between the normal and the refracted ray is known as the angle of incidence. (h) At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal. (i) Image is formed by a mirror due to refraction of light. (j) Rays of light incident parallel to the principal axis pass through the focus after reflection from a concave mirror. (k) A convex mirror is used as a shaving mirror. (l) The focal length of a convex mirror is equal to its adius of curvature. (m) A concave mirror converges the light rays, but a convex mirror diverges them. (n) A virtual image formed by a spherical mirror is always erect and situated behind the mirror. Ans. True - (d), (e), (h), (j), (m), (n), False - (a), (b), (c), (f), (g), (i), (k), (l)

7698.

Write True or false for each statement : (a) Water is optically denser than glass. (b) A ray of light when passes from glass to air, bends towards the normal. (c) The speed of light is more in glass than in water. (d) The depth of a pond when seen from above appears to be less. (e) Light travels at a lower speed in water than in air. (f) Light travels in the same straight line path while passing through different media. (g) The angle formed between the normal and the refracted ray is known as the angle of incidence. (h) At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal. (i) Image is formed by a mirror due to refraction of light. (j) Rays of light incident parallel to the principal axis pass through the focus after reflection from a concave mirror. (k) A convex mirror is used as a shaving mirror. (l) The focal length of a convex mirror is equal to its adius of curvature. (m) A concave mirror converges the light rays, but a convex mirror diverges them. (n) A virtual image formed by a spherical mirror is always erect and situated behind the mirror. Ans. True - (d), (e), (h), (j), (m), (n), False - (a), (b), (c), (f), (g), (i), (k), (l)

Answer»

Write True or false for each statement :

(a) Water is optically denser than glass.

(b) A ray of light when passes from glass to air, bends towards the normal.

(c) The speed of light is more in glass than in water.

(d) The depth of a pond when seen from above appears to be less.

(e) Light travels at a lower speed in water than in air.

(f) Light travels in the same straight line path while passing through different media.

(g) The angle formed between the normal and the refracted ray is known as the angle of incidence.

(h) At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.

(i) Image is formed by a mirror due to refraction of light.

(j) Rays of light incident parallel to the principal axis pass through the focus after reflection from a concave mirror.

(k) A convex mirror is used as a shaving mirror.

(l) The focal length of a convex mirror is equal to its adius of curvature.

(m) A concave mirror converges the light rays, but a convex mirror diverges them.

(n) A virtual image formed by a spherical mirror is always erect and situated behind the mirror.

Ans. True - (d), (e), (h), (j), (m), (n),

False - (a), (b), (c), (f), (g), (i), (k), (l)

Discussion

7699.	State the S.I. unit of moment of force.
Answer» State the S.I. unit of moment of force.

Discussion

7700.	Evaluate: (5x + 4y) (5x – 4y)
Answer» Evaluate: (5x + 4y) (5x – 4y)

Discussion

Explore topic-wise InterviewSolutions in .

What kind of force causes a change in motion?

Does gravitational force exist between two people standing on earth? If yes,why?

Explain why, sportsmen use shoes with spikes.

Question 1 In which of these mediums can sound travel? (i) Wood (ii) Water (iii) Air (iv) Vacuum

Question 11 (iv) State whether the following statements are True/False. The process of electric discharge cannot occur between clouds and the earth.

Amount of mass in a given volume is known as ___.

The rock that attracts metals is termed as

It is easier for a person to swim in sea water than in river water. The reason is that:

Write the full form of M.C.B.

What is the caise of lateral inversion?

When a glass rod is rubbed with silk the free electrons of glass rod are transferred to silk. But glass is a insulator and insulators do not have free electrons. So how did free electrons from glass rod get transferred to silk if glass rod doesn’t even have free electrons

There is no flow of current between two charged bodies when connected because (a) They have same quantity of charge (b) They have same potential (c) They have same capacity (d) They have the same ratio of potential per unit charge

Does gravity on first layer of water is same as the bottom layer?

Why does geostationary satellites always have to be on the equator??

How do our eyes perceive that the colour of banana is yellow?

Is it possible to boil water at zero degree celsius?

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 thrust(force acting normally to the surface) per unit area.

State one observation from everyday life which shows that sound travels much more slower than light.

How will our Earth look when seen from a space - ship or Moon?

Density of the largest planet of the solar system is:

Where is larynx located?

Which of the following has lost more electrons?

What are gross errors? Explain with its cause.

Why a loud sound is produced when we brust the balloon?

Change the sentence to the active voice. Such a beautiful sight had never been seen by Jaya before.

In a jar, kerosene is floating on water. Which of the following options is correct?

Name the first artificial satellite launched by India.

The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea ? (a) 15,000 Hz (b) 10 kHz (c) 50 kHz (4) 10,000 Hz

Which of the following might have been used by early age navigators and explorers to determine direction?

It is easier to cut with a sharp knife than with a blunt one. Explain.

A book placed on a desk is pushed towards the right. In which direction will the force of friction act on the book?

A force of 18 N is distributed uniformly on one surface of a cube of edge 6 cm. The pressure on this surface is

Sort the following in the correct order of power transmission to a household:

Why is a machine not 100% efficient?

We know that the pressure inside our body cancels the atmospheric pressure.But if the pressure exerted by our body increases and what will happen.

Refraction

A light ray is incident on a mirror such that it makes it makes 30∘ with the surface of the mirror. Find the angle of reflection. [2 MARKS]

What causes friction between two surfaces in contact when they try to slide past each other?

In the given mirror C – centre of the sphere to which the mirror is part of F – focus of the mirror P – pole of the mirror A – point on the mirror D – point on the principal axis. If a ray of light starts from C and is incident on A from which point will the reflected ray pass through?

In electrolysis process, the chemical change is caused due to ___ energy.

(a) Name three types of substances in which an electric current can produce a chemical effect. (b) State some of the characteristics of chemical changes brought about by the chemical effect of electric current. (c) Why does an electric bulb glow when a current passes through it ?

Does speed of sound varies with temperature

The molten material mixed with gases in the mantle of the earth is called ______.

During the installation of an electric circuit in the house, why do we use body earthing?

What is/are the basic component(s) of a hearing aid?

What is the direction of frictional force acting between two bodies moving one over another?

State the S.I. unit of moment of force.

Evaluate: (5x + 4y) (5x – 4y)