9478 + Interview Questions in Physics Page 157 InterviewSolution

7801.	You are provided with a negatively charged gold leaf electroscope. What happens when an ebonite rod rubbed with fur is brought near the disc of the electroscope?
Answer» You are provided with a negatively charged gold leaf electroscope. What happens when an ebonite rod rubbed with fur is brought near the disc of the electroscope?

Discussion

7802.	If you want to hear a train approaching from far away, why is it more convenient to put the ear to the track?
Answer» If you want to hear a train approaching from far away, why is it more convenient to put the ear to the track?

Discussion

7803.	Which among the following has largest thermal expansion?
Answer» Which among the following has largest thermal expansion?

Discussion

7804.	Removing ___ substances can control fire.
Answer» Removing ___ substances can control fire.

Discussion

7805.	A man applies a force of 20 N on an area of 2cm2. Calculate the pressure on that area.
Answer» A man applies a force of $20 N$ on an area of ${2 c m}^{2}$ . Calculate the pressure on that area.

Discussion

7806.	Write the characters of the image formed by a plane mirror.
Answer» Write the characters of the image formed by a plane mirror.

Discussion

7807.	Why is it not safe for an electrician to carry out electrical repairs in the outdoor areas during heavy downpour?
Answer» Why is it not safe for an electrician to carry out electrical repairs in the outdoor areas during heavy downpour?

Discussion

7808.	If sun is made of different types of gases,than why the gases are stucked there only,why they were not going here and there?
Answer» If sun is made of different types of gases,than why the gases are stucked there only,why they were not going here and there?

Discussion

7809.	What is a blind spot in our eyes?
Answer» What is a blind spot in our eyes?

Discussion

7810.	The displacement-distance graph for a particle in a wave is shown below. The wavelength(λ) of the wave is
Answer» The displacement-distance graph for a particle in a wave is shown below. The wavelength $(λ)$ of the wave is

Discussion

7811.	What information do you get about sunlight from the formation of a rainbow?
Answer» What information do you get about sunlight from the formation of a rainbow?

Discussion

7812.	Three different liquids fill three cylindrical tubes up to same height. If the relation between the density of the three liquids dA>dB>dC, then what is the relationship between pressure exerted at the bottom of the container? PA,PB and PC represent the pressure exerted at the bottom of the tube, respectively.
Answer» Three different liquids fill three cylindrical tubes up to same height. If the relation between the density of the three liquids $d_{A} > d_{B} > d_{C}$ , then what is the relationship between pressure exerted at the bottom of the container? $P_{A}, P_{B} a n d P_{C}$ represent the pressure exerted at the bottom of the tube, respectively.

Discussion

7813.	What is friction? What is the direction of friction if mickey mouse is sliding on towards the right? [3 MARKS]
Answer» What is friction? What is the direction of friction if mickey mouse is sliding on towards the right? [3 MARKS]

7813.

What is friction? What is the direction of friction if mickey mouse is sliding on towards the right? [3 MARKS]

Answer»

What is friction? What is the direction of friction if mickey mouse is sliding on towards the right? [3 MARKS]

Discussion

7814.	Suppose, you are assigned a work in which you have to apply some force to stop a block which is moving towards the east. What could be the best possible direction of a force to stop the moving block?
Answer» Suppose, you are assigned a work in which you have to apply some force to stop a block which is moving towards the east. What could be the best possible direction of a force to stop the moving block?

Discussion

7815.	After electroplating a metal spoon with copper in the laboratory, a student interchanged the connections of the copper plate and spoon. What do you think will happen?
Answer» After electroplating a metal spoon with copper in the laboratory, a student interchanged the connections of the copper plate and spoon. What do you think will happen?

Discussion

7816.	An athlete running at a constant acceleration of 2.5 ms−2, produces a force of 180 N. What is the mass of the athlete?
Answer» An athlete running at a constant acceleration of $2.5 m s^{- 2}$ , produces a force of $180 N$ . What is the mass of the athlete?

Discussion

7817.	a apple falls down due to gravity of earth which pulls it down.so we think that tha apple falls down but can it be earth accelerating upwards to meet the apple ? if yes then by which frame of reference we will be able to see it?
Answer» a apple falls down due to gravity of earth which pulls it down.so we think that tha apple falls down but can it be earth accelerating upwards to meet the apple ? if yes then by which frame of reference we will be able to see it?

Discussion

7818.	Define static friction
Answer» Define static friction

Discussion

7819.	Which law determines the direction of the reflected ray from a plane mirror?
Answer» Which law determines the direction of the reflected ray from a plane mirror?

Discussion

7820.	Question 4 A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in the figure as A, B, C and D. In which position mirror will be visible? (a) A (b) B (c) C (d) D
Answer» Question 4 A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in the figure as A, B, C and D. In which position mirror will be visible? (a) A (b) B (c) C (d) D

7820.

Question 4 A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in the figure as A, B, C and D. In which position mirror will be visible? (a) A (b) B (c) C (d) D

Answer»

Question 4

A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in the figure as A, B, C and D. In which position mirror will be visible?

(a) A
(b) B
(c) C
(d) D

Discussion

7821.	Question 11. Gurmit wanted to perform an activity using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teacher's advice?
Answer» Question 11. Gurmit wanted to perform an activity using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teacher's advice?

Discussion

7822.	A string connected to the end of the tuning fork kept in a horizontal position, will execute _______.
Answer» A string connected to the end of the tuning fork kept in a horizontal position, will execute _______.

Discussion

7823.	A tester is made with the two terminals of a battery connected to separate wires, each with one end free. A light bulb is also a part of the circuit. Now an object is used to connect the free ends, and it is observed that the light bulb does not glow, in other words, there is no electricity flowing. Which of the following could be that object?
Answer» A tester is made with the two terminals of a battery connected to separate wires, each with one end free. A light bulb is also a part of the circuit. Now an object is used to connect the free ends, and it is observed that the light bulb does not glow, in other words, there is no electricity flowing. Which of the following could be that object?

Discussion

7824.	In summer, if a wooden chair and an iron chair kept outside for a long time, then which one will be at a higher temperature?
Answer» In summer, if a wooden chair and an iron chair kept outside for a long time, then which one will be at a higher temperature?

Discussion

7825.	In evaporation,
Answer» In evaporation,

Discussion

7826.	A concave mirror of radius of curvature 60cm is placed at the bottom of a tank containing water up to a height of 20cm. The mirror faces upwards with its axis vertical. Sunlight falls normally on the surface of the water and the image of the sun is formed. If refractive index of water is 43 then with the observer in air, the distance of the image from the surface of water is
Answer» A concave mirror of radius of curvature 60cm is placed at the bottom of a tank containing water up to a height of 20cm. The mirror faces upwards with its axis vertical. Sunlight falls normally on the surface of the water and the image of the sun is formed. If refractive index of water is $\frac{4}{3}$ then with the observer in air, the distance of the image from the surface of water is

Discussion

7827.	How fast does light travel?
Answer» How fast does light travel?

Discussion

7828.	What happens to the volume of the gas if the temperature of the gas increases? Why does the direction of the wind change in the circulation of air from the poles to the latitudes? [3 MARKS]
Answer» What happens to the volume of the gas if the temperature of the gas increases? Why does the direction of the wind change in the circulation of air from the poles to the latitudes? [3 MARKS]

Discussion

7829.	How do ball bearings help reducing friction ?
Answer» How do ball bearings help reducing friction ?

Discussion

7830.	The magnitude of an earthquake is measured on: (a) Celsius scale (b) Kelvin scale (c) Decibel scale (d) Richter scale
Answer» The magnitude of an earthquake is measured on: (a) Celsius scale (b) Kelvin scale (c) Decibel scale (d) Richter scale

7830.

The magnitude of an earthquake is measured on: (a) Celsius scale (b) Kelvin scale (c) Decibel scale (d) Richter scale

Answer»

The magnitude of an earthquake is measured on:

(a) Celsius scale (b) Kelvin scale (c) Decibel scale (d) Richter scale

Discussion

7831.	With what acceleration 'a' should the lift descend so that the block of mass M exerts a force Mg4 on the floor of the box?
Answer» With what acceleration 'a' should the lift descend so that the block of mass M exerts a force Mg4 on the floor of the box?

7831.

With what acceleration 'a' should the lift descend so that the block of mass M exerts a force Mg4 on the floor of the box?

Answer»

With what acceleration 'a' should the lift descend so that the block of mass M exerts a force Mg4 on the floor of the box?

Discussion

7832.	Explain buoyant force and buoyancy.
Answer» Explain buoyant force and buoyancy.

Discussion

7833.	What is the difference between force and pressure
Answer» What is the difference between force and pressure

Discussion

7834.	how do Formula 1 cars manage to develop friction even though they don't have treading
Answer» how do Formula 1 cars manage to develop friction even though they don't have treading

Discussion

7835.	What is the maximum audible frequency for human beings ?
Answer» What is the maximum audible frequency for human beings ?

Discussion

7836.	What do you mean by ventor? What is the role of it in our life ?
Answer» What do you mean by ventor? What is the role of it in our life ?

Discussion

7837.	How is loudness related to the amplitude of wave ?
Answer» How is loudness related to the amplitude of wave ?

Discussion

7838.	(a) What is meant by electroplating? What is the purpose of electroplating? (b) Which properties of chromium metal make it suitable for electroplating it on car bumpers, bath taps and bicycle handlebars, etc., made of iron?
Answer» (a) What is meant by electroplating? What is the purpose of electroplating? (b) Which properties of chromium metal make it suitable for electroplating it on car bumpers, bath taps and bicycle handlebars, etc., made of iron?

Discussion

7839.	Which of the following are transferred from one object to another when these two objects are charged by friction? (a) atoms (b) protons (c) neutrons (d) electrons
Answer» Which of the following are transferred from one object to another when these two objects are charged by friction? (a) atoms (b) protons (c) neutrons (d) electrons

7839.

Which of the following are transferred from one object to another when these two objects are charged by friction? (a) atoms (b) protons (c) neutrons (d) electrons

Answer»

Which of the following are transferred from one object to another when these two objects are charged by friction?

(a) atoms (b) protons (c) neutrons (d) electrons

Discussion

7840.	An iron needle sinks in water but floats on mercury of density.Give reason
Answer» An iron needle sinks in water but floats on mercury of density.Give reason

Discussion

7841.	The size of the pupil of the eye is adjusted by: (a) cornea (b) ciliary muscles (c) optic nerve (d) iris
Answer» The size of the pupil of the eye is adjusted by: (a) cornea (b) ciliary muscles (c) optic nerve (d) iris

7841.

The size of the pupil of the eye is adjusted by: (a) cornea (b) ciliary muscles (c) optic nerve (d) iris

Answer»

The size of the pupil of the eye is adjusted by:

(a) cornea

(b) ciliary muscles

(c) optic nerve

(d) iris

Discussion

7842.	if a stationary bus was suddenly speed up passenger are thrown in backward direction why is it so If it is because of inertia then which type of inertia
Answer» if a stationary bus was suddenly speed up passenger are thrown in backward direction why is it so If it is because of inertia then which type of inertia

7842.

if a stationary bus was suddenly speed up passenger are thrown in backward direction why is it so If it is because of inertia then which type of inertia

Answer»

if a stationary bus was suddenly speed up passenger are thrown in backward direction why is it so

If it is because of inertia then which type of inertia

Discussion

7843.	In the figure, ∠POR and ∠QOR form a linear pair. If a – b = 70o the values of a and b are
Answer» In the figure, ∠POR and ∠QOR form a linear pair. If a – b = 70^o the values of a and b are

7843.

In the figure, ∠POR and ∠QOR form a linear pair. If a – b = 70o the values of a and b are

Answer»

In the figure, ∠POR and ∠QOR form a linear pair. If a – b = 70^o the values of a and b are

Discussion

7844.	Which of the following constellations is visible during the summer?
Answer» Which of the following constellations is visible during the summer?

Discussion

7845.	The level of water in a beaker________when a spoon full of sugar/salt is added to it.
Answer» The level of water in a beaker________when a spoon full of sugar/salt is added to it.

Discussion

7846.	Identify the correct statements that define matter.
Answer» Identify the correct statements that define matter.

Discussion

7847.	What is optical adis and non optical AIDS
Answer» What is optical adis and non optical AIDS

Discussion

7848.	How to solve the following numerical A pressure of won pa acts on an areaof 0.3m2. The force acting on the area will be
Answer» How to solve the following numerical A pressure of won pa acts on an areaof 0.3m2. The force acting on the area will be

Discussion

7849.	What is the time taken by an object to complete one oscillation called?
Answer» What is the time taken by an object to complete one oscillation called?

Discussion

7850.	An object moves with an acceleration of 3 ms−2 when a force of 30 N is applied. Find the mass of the body.
Answer» An object moves with an acceleration of $3 m s^{- 2}$ when a force of $30 N$ is applied. Find the mass of the body.

Discussion

Explore topic-wise InterviewSolutions in .

You are provided with a negatively charged gold leaf electroscope. What happens when an ebonite rod rubbed with fur is brought near the disc of the electroscope?

If you want to hear a train approaching from far away, why is it more convenient to put the ear to the track?

Which among the following has largest thermal expansion?

Removing ___ substances can control fire.

A man applies a force of 20 N on an area of 2cm2. Calculate the pressure on that area.

Write the characters of the image formed by a plane mirror.

Why is it not safe for an electrician to carry out electrical repairs in the outdoor areas during heavy downpour?

If sun is made of different types of gases,than why the gases are stucked there only,why they were not going here and there?

What is a blind spot in our eyes?

The displacement-distance graph for a particle in a wave is shown below. The wavelength(λ) of the wave is

What information do you get about sunlight from the formation of a rainbow?

What is friction? What is the direction of friction if mickey mouse is sliding on towards the right? [3 MARKS]

Suppose, you are assigned a work in which you have to apply some force to stop a block which is moving towards the east. What could be the best possible direction of a force to stop the moving block?

After electroplating a metal spoon with copper in the laboratory, a student interchanged the connections of the copper plate and spoon. What do you think will happen?

An athlete running at a constant acceleration of 2.5 ms−2, produces a force of 180 N. What is the mass of the athlete?

a apple falls down due to gravity of earth which pulls it down.so we think that tha apple falls down but can it be earth accelerating upwards to meet the apple ? if yes then by which frame of reference we will be able to see it?

Define static friction

Which law determines the direction of the reflected ray from a plane mirror?

Question 4 A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in the figure as A, B, C and D. In which position mirror will be visible? (a) A (b) B (c) C (d) D

Question 11. Gurmit wanted to perform an activity using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teacher's advice?

A string connected to the end of the tuning fork kept in a horizontal position, will execute _______.

In summer, if a wooden chair and an iron chair kept outside for a long time, then which one will be at a higher temperature?

In evaporation,

How fast does light travel?

What happens to the volume of the gas if the temperature of the gas increases? Why does the direction of the wind change in the circulation of air from the poles to the latitudes? [3 MARKS]

How do ball bearings help reducing friction ?

The magnitude of an earthquake is measured on: (a) Celsius scale (b) Kelvin scale (c) Decibel scale (d) Richter scale

With what acceleration 'a' should the lift descend so that the block of mass M exerts a force Mg4 on the floor of the box?

Explain buoyant force and buoyancy.

What is the difference between force and pressure

how do Formula 1 cars manage to develop friction even though they don't have treading

What is the maximum audible frequency for human beings ?

What do you mean by ventor? What is the role of it in our life ?

How is loudness related to the amplitude of wave ?

(a) What is meant by electroplating? What is the purpose of electroplating? (b) Which properties of chromium metal make it suitable for electroplating it on car bumpers, bath taps and bicycle handlebars, etc., made of iron?

Which of the following are transferred from one object to another when these two objects are charged by friction? (a) atoms (b) protons (c) neutrons (d) electrons

An iron needle sinks in water but floats on mercury of density.Give reason

The size of the pupil of the eye is adjusted by: (a) cornea (b) ciliary muscles (c) optic nerve (d) iris

if a stationary bus was suddenly speed up passenger are thrown in backward direction why is it so If it is because of inertia then which type of inertia

In the figure, ∠POR and ∠QOR form a linear pair. If a – b = 70o the values of a and b are

Which of the following constellations is visible during the summer?

The level of water in a beaker________when a spoon full of sugar/salt is added to it.

Identify the correct statements that define matter.

What is optical adis and non optical AIDS

How to solve the following numerical A pressure of won pa acts on an areaof 0.3m2. The force acting on the area will be

What is the time taken by an object to complete one oscillation called?

An object moves with an acceleration of 3 ms−2 when a force of 30 N is applied. Find the mass of the body.