16569 + Interview Questions in Physics

1.	The fuel which is not used at thermal power plants is : (a) coal (b) uranium (c) natural gas (d) fuel oil
Answer» The fuel which is not used at thermal power plants is : (a) coal (b) uranium (c) natural gas (d) fuel oil

Discussion

2.	The wavelength range of white light is : (a) 4000 nm to 8000 nm (b) 40 nm to 80 nm (c) 400 nm to 800 nm (d) 4 nm to 8 nm.
Answer» The wavelength range of white light is : (a) 4000 nm to 8000 nm (b) 40 nm to 80 nm (c) 400 nm to 800 nm (d) 4 nm to 8 nm.

2.

The wavelength range of white light is : (a) 4000 nm to 8000 nm (b) 40 nm to 80 nm (c) 400 nm to 800 nm (d) 4 nm to 8 nm.

Answer»

The wavelength range of white light is :

(a) 4000 nm to 8000 nm

(b) 40 nm to 80 nm

(c) 400 nm to 800 nm

(d) 4 nm to 8 nm.

Discussion

3.	Will always the rays coming from infinity parallel to the principal axis?
Answer» Will always the rays coming from infinity parallel to the principal axis?

Discussion

4.	Nuclear fission can be initiated by bombarding the nucleus with?
Answer» Nuclear fission can be initiated by bombarding the nucleus with?

Discussion

5.	The conflicts between humans and wild animals occur due to
Answer» The conflicts between humans and wild animals occur due to

Discussion

6.	A tuning fork of frequency 256 Hz will resonate with another tuning fork of frequency:
Answer» A tuning fork of frequency 256 Hz will resonate with another tuning fork of frequency:

Discussion

7.	The frequency of yellow light with wavelength 600 nm is:
Answer» The frequency of yellow light with wavelength 600 nm is:

Discussion

8.	A ray of light passes from glass into air, angle of refraction; (a) equal to the angle of incidence (b) greater than the angle of incidence (c) smaller than the angle of incidence (d) 45∘
Answer» A ray of light passes from glass into air, angle of refraction; (a) equal to the angle of incidence (b) greater than the angle of incidence (c) smaller than the angle of incidence (d) $45^{\circ}$

Discussion

9.	Question 8 What is the acceleration of free fall?
Answer» Question 8 What is the acceleration of free fall?

Discussion

10.	Complete the following nuclear changes:
Answer» Complete the following nuclear changes:

10.

Complete the following nuclear changes:

Answer»

Complete the following nuclear changes:

Discussion

11.	Steam at 100∘C is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15oC till the temperature of the calorimeter and its contents rises to 80∘C. What will be the mass of the steam condensed (in kg)? Take: Specific heat of water=1 cal gm−1 Latent heat of vaporization=540 cal gm−1
Answer» Steam at $100^{\circ} C$ is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at $15^{o} C$ till the temperature of the calorimeter and its contents rises to $80^{\circ} C .$ What will be the mass of the steam condensed (in kg)? Take: Specific heat of water $= 1 c a l g m^{- 1}$ Latent heat of vaporization $= 540 c a l g m^{- 1}$

11.

Steam at 100∘C is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15oC till the temperature of the calorimeter and its contents rises to 80∘C. What will be the mass of the steam condensed (in kg)? Take: Specific heat of water=1 cal gm−1 Latent heat of vaporization=540 cal gm−1

Answer»

Steam at $100^{\circ} C$ is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at $15^{o} C$ till the temperature of the calorimeter and its contents rises to $80^{\circ} C .$

What will be the mass of the steam condensed (in kg)?

Take:

Specific heat of water $= 1 c a l g m^{- 1}$

Latent heat of vaporization $= 540 c a l g m^{- 1}$

Discussion

12.	Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye ?
Answer» Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye ?

Discussion

13.	State Two differences between the natural and forced vibrations.
Answer» State Two differences between the natural and forced vibrations.

Discussion

14.	The displacement y (in cm) produced by a simple harmonic wave is y=10π sin⎧⎪⎪⎩2000 π t − π x17⎫⎪⎪⎭ The periodic time and maximum velocity of the particles in the medium will respectively be [CPMT 1986]
Answer» The displacement y (in cm) produced by a simple harmonic wave is $y = \frac{10}{π} s i n ⎧ ⎪⎪ ⎩ 2000 π t - \frac{π x}{17} ⎫ ⎪⎪ ⎭$ The periodic time and maximum velocity of the particles in the medium will respectively be [CPMT 1986]

14.

The displacement y (in cm) produced by a simple harmonic wave is y=10π sin⎧⎪⎪⎩2000 π t − π x17⎫⎪⎪⎭ The periodic time and maximum velocity of the particles in the medium will respectively be [CPMT 1986]

Answer»

The displacement y (in cm) produced by a simple harmonic wave is

$y = \frac{10}{π} s i n ⎧ ⎪⎪ ⎩ 2000 π t - \frac{π x}{17} ⎫ ⎪⎪ ⎭$

The periodic time and maximum velocity of the particles in the medium will respectively be

[CPMT 1986]

Discussion

15.	In a convex lens, where is the image formed, when an object is placed at 2F?
Answer» In a convex lens, where is the image formed, when an object is placed at 2F?

Discussion

16.

In a lens, if u - distance of object from lens v - distance of image from lens hi - height of image ho - height of object. Compare the following quanties. A B hiho vu

Answer»

In a lens, if
$u$ - distance of object from lens
$v$ - distance of image from lens
$h_{i}$ - height of image
$h_{o}$ - height of object. Compare the following quanties.

A	B
$\frac{h_{i}}{h_{o}}$	$\frac{v}{u}$

Discussion

17.	Statement 1: Myopia is corrected by the use of concave lens. Statement 2: A concave lens diverges the light coming from the object kept at infinity and makes it appear to be within the far point of myopic eye, which then acts as the object for the myopic eye thus helping to view it.
Answer» Statement 1: Myopia is corrected by the use of concave lens. Statement 2: A concave lens diverges the light coming from the object kept at infinity and makes it appear to be within the far point of myopic eye, which then acts as the object for the myopic eye thus helping to view it.

17.

Statement 1: Myopia is corrected by the use of concave lens. Statement 2: A concave lens diverges the light coming from the object kept at infinity and makes it appear to be within the far point of myopic eye, which then acts as the object for the myopic eye thus helping to view it.

Answer»

Statement 1: Myopia is corrected by the use of concave lens.

Statement 2: A concave lens diverges the light coming from the object kept at infinity and makes it appear to be within the far point of myopic eye, which then acts as the object for the myopic eye thus helping to view it.

Discussion

18.	The light-sensitive cells found on the retina are known as:
Answer» The light-sensitive cells found on the retina are known as:

Discussion

19.	If the near point of eyes of a man is 75 cm, then what should be the focal length of the lens if he wants to read the newspaper at a distance of 25 cm?
Answer» If the near point of eyes of a man is 75 cm, then what should be the focal length of the lens if he wants to read the newspaper at a distance of 25 cm?

Discussion

20.	Three incandescent bulb of 100 W each are connected in series in a circuit. In another circuit, another set of threee bulbs of the same wattage are connected in parallel to the same source. Will the bulb in the two circuits glow with the same brightness? Justify your answer.
Answer» Three incandescent bulb of 100 W each are connected in series in a circuit. In another circuit, another set of threee bulbs of the same wattage are connected in parallel to the same source. Will the bulb in the two circuits glow with the same brightness? Justify your answer.

Discussion

21.	How? The magnetic field inside the body forms the basis of obtaining the images of different body parts.
Answer» How? The magnetic field inside the body forms the basis of obtaining the images of different body parts.

Discussion

22.	The value of g at a particular point on the earth surface is 9.8 ms−2. Suppose the earth suddenly shrinks uniformly to half its present size without losing any mass. The value of ‘g’ at the same point (assuming that the distance of the point from the centre of earth does not shrink) will now be:
Answer» The value of $g$ at a particular point on the earth surface is $9.8 m s^{- 2}$ . Suppose the earth suddenly shrinks uniformly to half its present size without losing any mass. The value of ‘g’ at the same point (assuming that the distance of the point from the centre of earth does not shrink) will now be:

Discussion

23.	What is the substance that conducts electricity in a solution called?
Answer» What is the substance that conducts electricity in a solution called?

Discussion

24.	A transformer supplying electrical energy to a factory changes the 11 000 V a.c. supply to 440 V a.c. for use in the factory. The current in the secondary coil is 200 A. Calculate the current in the primary coil, assuming no losses from the transformer.
Answer» A transformer supplying electrical energy to a factory changes the 11 000 V a.c. supply to 440 V a.c. for use in the factory. The current in the secondary coil is 200 A. Calculate the current in the primary coil, assuming no losses from the transformer.

24.

A transformer supplying electrical energy to a factory changes the 11 000 V a.c. supply to 440 V a.c. for use in the factory. The current in the secondary coil is 200 A. Calculate the current in the primary coil, assuming no losses from the transformer.

Answer»

A transformer supplying electrical energy to a factory changes the 11 000 V a.c. supply to 440 V a.c. for use in the factory. The current in the secondary coil is 200 A.

Calculate the current in the primary coil, assuming no losses from the transformer.

Discussion

25.	If a light ray from air enters 3 media in such a way that the refracted angles are 450, 300 and 600 respectively, then which is the densest medium among the three? In the figure, n1 represents refractive index of air.
Answer» If a light ray from air enters 3 media in such a way that the refracted angles are $45^{0}$ , $30^{0}$ and $60^{0}$ respectively, then which is the densest medium among the three? In the figure, $n_{1}$ represents refractive index of air.

25.

If a light ray from air enters 3 media in such a way that the refracted angles are 450, 300 and 600 respectively, then which is the densest medium among the three? In the figure, n1 represents refractive index of air.

Answer»

If a light ray from air enters 3 media in such a way that the refracted angles are $45^{0}$ , $30^{0}$ and $60^{0}$ respectively, then which is the densest medium among the three?

In the figure, $n_{1}$ represents refractive index of air.

Discussion

26.	Which of the following is an ohmic resistor?
Answer» Which of the following is an ohmic resistor?

Discussion

27.	Calculate the amount of heat required to raise the temperature of 40 kg of compound from 10 ∘C to 35 ∘C . Specific heat capacity of the compound is 50 J/kg∘C.50000
Answer» Calculate the amount of heat required to raise the temperature of $40 k g$ of compound from $10^{\circ} C$ to $35^{\circ} C$ . Specific heat capacity of the compound is $50 J / k g^{\circ} C$ . 50000

Discussion

28.	In the following diagram, Calculate the approximate current in branch A and Branch B of the circuit.
Answer» In the following diagram, Calculate the approximate current in branch A and Branch B of the circuit.

28.

In the following diagram, Calculate the approximate current in branch A and Branch B of the circuit.

Answer»

In the following diagram, Calculate the approximate current in branch A and Branch B of the circuit.

Discussion

29.	State the energy changes in the following cases while in use: (a) loudspeaker (b) a steam engine (c) microphone (d) washing machine (e) a glowing electric bulb (f) burning coal (g) a solar cell (h) bio-gas burner (i) an electric cell in a circuit (j) a petrol engine of a running car (k) an electric toaster (l) a photovoltaic cell (m) an electromagnet.
Answer» State the energy changes in the following cases while in use: (a) loudspeaker (b) a steam engine (c) microphone (d) washing machine (e) a glowing electric bulb (f) burning coal (g) a solar cell (h) bio-gas burner (i) an electric cell in a circuit (j) a petrol engine of a running car (k) an electric toaster (l) a photovoltaic cell (m) an electromagnet.

29.

State the energy changes in the following cases while in use: (a) loudspeaker (b) a steam engine (c) microphone (d) washing machine (e) a glowing electric bulb (f) burning coal (g) a solar cell (h) bio-gas burner (i) an electric cell in a circuit (j) a petrol engine of a running car (k) an electric toaster (l) a photovoltaic cell (m) an electromagnet.

Answer»

State the energy changes in the following cases while in use:

(a) loudspeaker

(b) a steam engine

(c) microphone

(d) washing machine

(e) a glowing electric bulb

(f) burning coal

(g) a solar cell

(h) bio-gas burner

(i) an electric cell in a circuit

(j) a petrol engine of a running car

(k) an electric toaster

(l) a photovoltaic cell

(m) an electromagnet.

Discussion

30.	A combination consists of three resistors in series. Four similar sets are connected in parallel. If the resistance of each resistor is 2 ohm, find the resistance of the combination.
Answer» A combination consists of three resistors in series. Four similar sets are connected in parallel. If the resistance of each resistor is 2 ohm, find the resistance of the combination.

Discussion

31.	The twinkling of stars at night is due to
Answer» The twinkling of stars at night is due to

Discussion

32.	What do you mean by power rating of an electrical appliance? How do you use it to calculate (a) the resistance of the appliance, and (b) the safe limit of current in it, while in use?
Answer» What do you mean by power rating of an electrical appliance? How do you use it to calculate (a) the resistance of the appliance, and (b) the safe limit of current in it, while in use?

Discussion

33.	The potential difference (VA – VB) between the points A and B in the given figure is
Answer» The potential difference ( $V_{A} - V_{B}$ ) between the points A and B in the given figure is

Discussion

34.	The given set up demonstrates a property of light. Identify that property.
Answer» The given set up demonstrates a property of light. Identify that property.

Discussion

35.	Due to internal combustion inside a rocket, gases are ejected at the rate of 2.4 kgminute. The velocity of the gases with respect to the rocket is 400 ms. Calculate force exerted on the rocket. (Give your answer in N) ___
Answer» Due to internal combustion inside a rocket, gases are ejected at the rate of 2.4 $\frac{k g}{m i n u t e}$ . The velocity of the gases with respect to the rocket is 400 $\frac{m}{s}$ . Calculate force exerted on the rocket. (Give your answer in N) ___

Discussion

36.	Why is bio gas a better fuel than animal dung cakes? please answer according to 5 Mark question
Answer» Why is bio gas a better fuel than animal dung cakes? please answer according to 5 Mark question

Discussion

37.	A nucleus of mass M+Δm is at rest and it decays into two daughter nuclei of equal mass M2 each. The speed of the light is c. What is the speed of the daughter nuclei?
Answer» A nucleus of mass $M + Δ m$ is at rest and it decays into two daughter nuclei of equal mass $\frac{M}{2}$ each. The speed of the light is $c$ . What is the speed of the daughter nuclei?

Discussion

38.	Among these two scenarios, identify the action force and action force. Then match the fallowing? Scenario 1: A person is pushing a book on the table. Scenario 2: A gun is fired. Column−AColumn−B1.Action forcea.Force applied by the book on the boy2.Reaction forceb.Force applied by the boy on the bookc.Recoil force on the gund.Accelerating force on the bullet
Answer» Among these two scenarios, identify the action force and action force. Then match the fallowing? Scenario 1 $:$ A person is pushing a book on the table. Scenario 2 $:$ A gun is fired. $\begin{matrix} C o l u m n - A & C o l u m n - B 1. & A c t i o n f o r c e & a . & F o r c e a p p l i e d b y t h e b o o k o n t h e b o y 2. & R e a c t i o n f o r c e & b . & F o r c e a p p l i e d b y t h e b o y o n t h e b o o k c . & R e c o i l f o r c e o n t h e g u n d . & A c c e l e r a t i n g f o r c e o n t h e b u l l e t \end{matrix}$

38.

Among these two scenarios, identify the action force and action force. Then match the fallowing? Scenario 1: A person is pushing a book on the table. Scenario 2: A gun is fired. Column−AColumn−B1.Action forcea.Force applied by the book on the boy2.Reaction forceb.Force applied by the boy on the bookc.Recoil force on the gund.Accelerating force on the bullet

Answer»

Among these two scenarios, identify the action force and action force. Then match the fallowing?

Scenario 1 $:$ A person is pushing a book on the table.

Scenario 2 $:$ A gun is fired.

$\begin{matrix} C o l u m n - A & C o l u m n - B 1. & A c t i o n f o r c e & a . & F o r c e a p p l i e d b y t h e b o o k o n t h e b o y 2. & R e a c t i o n f o r c e & b . & F o r c e a p p l i e d b y t h e b o y o n t h e b o o k c . & R e c o i l f o r c e o n t h e g u n d . & A c c e l e r a t i n g f o r c e o n t h e b u l l e t \end{matrix}$

Discussion

39.	What is the use of the various components of the electric generator and the electric motor ?
Answer» What is the use of the various components of the electric generator and the electric motor ?

Discussion

40.	Identify the words which can be used to replace the underlined part of the sentence. The condition of weather in the northern parts of India has become so extreme and unpredictable that the weather has a direct and severe impact on the lives of the people living in this place.
Answer» Identify the words which can be used to replace the underlined part of the sentence. The condition of weather in the northern parts of India has become so extreme and unpredictable that the weather has a direct and severe impact on the lives of the people living in this place.

40.

Identify the words which can be used to replace the underlined part of the sentence. The condition of weather in the northern parts of India has become so extreme and unpredictable that the weather has a direct and severe impact on the lives of the people living in this place.

Answer»

Identify the words which can be used to replace the underlined part of the sentence.

The condition of weather in the northern parts of India has become so extreme and unpredictable that the weather has a direct and severe impact on the lives of the people living in this place.

Discussion

41.	Choose the correct option for the situation given in the following diagram.
Answer» Choose the correct option for the situation given in the following diagram.

Discussion

42.	The conditions required for total internal reflection of light to take place.
Answer» The conditions required for total internal reflection of light to take place.

Discussion

43.	Which part of the eye gives us our eye colour__________?
Answer» Which part of the eye gives us our eye colour__________?

Discussion

44.	Explain why A. Aqua solution of an acid conduct electricity. B. For a dilution of acid acid is added into water and not water into acid.
Answer» Explain why A. Aqua solution of an acid conduct electricity. B. For a dilution of acid acid is added into water and not water into acid.

44.

Explain why A. Aqua solution of an acid conduct electricity. B. For a dilution of acid acid is added into water and not water into acid.

Answer»

Explain why

A. Aqua solution of an acid conduct electricity.

B. For a dilution of acid acid is added into water and not water into acid.

Discussion

45.	The SI unit of pressure and thrust are respectively:
Answer» The SI unit of pressure and thrust are respectively:

Discussion

46.	What is the current flowing through a conductor when a charge of 40C flows through for 2minutes?
Answer» What is the current flowing through a conductor when a charge of 40C flows through for 2minutes?

Discussion

47.	Which of the following are fossil fuels?
Answer» Which of the following are fossil fuels?

Discussion

48.	How does a wind mill generate electric energy ?
Answer» How does a wind mill generate electric energy ?

Discussion

49.	The image of an object formed by a plane mirror is : (a) virtual (b) real (c) diminished (d) upside-down
Answer» The image of an object formed by a plane mirror is : (a) virtual (b) real (c) diminished (d) upside-down

Discussion

50.	A ray of light travelling in glass emerges into air. State whether it will bend towards the normal or away from the normal.
Answer» A ray of light travelling in glass emerges into air. State whether it will bend towards the normal or away from the normal.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The fuel which is not used at thermal power plants is : (a) coal (b) uranium (c) natural gas (d) fuel oil

The wavelength range of white light is : (a) 4000 nm to 8000 nm (b) 40 nm to 80 nm (c) 400 nm to 800 nm (d) 4 nm to 8 nm.

Will always the rays coming from infinity parallel to the principal axis?

Nuclear fission can be initiated by bombarding the nucleus with?

The conflicts between humans and wild animals occur due to

A tuning fork of frequency 256 Hz will resonate with another tuning fork of frequency:

The frequency of yellow light with wavelength 600 nm is:

A ray of light passes from glass into air, angle of refraction; (a) equal to the angle of incidence (b) greater than the angle of incidence (c) smaller than the angle of incidence (d) 45∘

Question 8 What is the acceleration of free fall?

Complete the following nuclear changes:

Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye ?

State Two differences between the natural and forced vibrations.

The displacement y (in cm) produced by a simple harmonic wave is y=10π sin⎧⎪⎪⎩2000 π t − π x17⎫⎪⎪⎭ The periodic time and maximum velocity of the particles in the medium will respectively be [CPMT 1986]

In a convex lens, where is the image formed, when an object is placed at 2F?

In a lens, if u - distance of object from lens v - distance of image from lens hi - height of image ho - height of object. Compare the following quanties. A B hiho vu

Statement 1: Myopia is corrected by the use of concave lens. Statement 2: A concave lens diverges the light coming from the object kept at infinity and makes it appear to be within the far point of myopic eye, which then acts as the object for the myopic eye thus helping to view it.

The light-sensitive cells found on the retina are known as:

If the near point of eyes of a man is 75 cm, then what should be the focal length of the lens if he wants to read the newspaper at a distance of 25 cm?

Three incandescent bulb of 100 W each are connected in series in a circuit. In another circuit, another set of threee bulbs of the same wattage are connected in parallel to the same source. Will the bulb in the two circuits glow with the same brightness? Justify your answer.

How? The magnetic field inside the body forms the basis of obtaining the images of different body parts.

What is the substance that conducts electricity in a solution called?

A transformer supplying electrical energy to a factory changes the 11 000 V a.c. supply to 440 V a.c. for use in the factory. The current in the secondary coil is 200 A. Calculate the current in the primary coil, assuming no losses from the transformer.

If a light ray from air enters 3 media in such a way that the refracted angles are 450, 300 and 600 respectively, then which is the densest medium among the three? In the figure, n1 represents refractive index of air.

Which of the following is an ohmic resistor?

Calculate the amount of heat required to raise the temperature of 40 kg of compound from 10 ∘C to 35 ∘C . Specific heat capacity of the compound is 50 J/kg∘C.50000

In the following diagram, Calculate the approximate current in branch A and Branch B of the circuit.

A combination consists of three resistors in series. Four similar sets are connected in parallel. If the resistance of each resistor is 2 ohm, find the resistance of the combination.

The twinkling of stars at night is due to

What do you mean by power rating of an electrical appliance? How do you use it to calculate (a) the resistance of the appliance, and (b) the safe limit of current in it, while in use?

The potential difference (VA – VB) between the points A and B in the given figure is

The given set up demonstrates a property of light. Identify that property.

Due to internal combustion inside a rocket, gases are ejected at the rate of 2.4 kgminute. The velocity of the gases with respect to the rocket is 400 ms. Calculate force exerted on the rocket. (Give your answer in N) ___

Why is bio gas a better fuel than animal dung cakes? please answer according to 5 Mark question

A nucleus of mass M+Δm is at rest and it decays into two daughter nuclei of equal mass M2 each. The speed of the light is c. What is the speed of the daughter nuclei?

What is the use of the various components of the electric generator and the electric motor ?

Identify the words which can be used to replace the underlined part of the sentence. The condition of weather in the northern parts of India has become so extreme and unpredictable that the weather has a direct and severe impact on the lives of the people living in this place.

Choose the correct option for the situation given in the following diagram.

The conditions required for total internal reflection of light to take place.

Which part of the eye gives us our eye colour__________?

Explain why A. Aqua solution of an acid conduct electricity. B. For a dilution of acid acid is added into water and not water into acid.

The SI unit of pressure and thrust are respectively:

What is the current flowing through a conductor when a charge of 40C flows through for 2minutes?

Which of the following are fossil fuels?

How does a wind mill generate electric energy ?

The image of an object formed by a plane mirror is : (a) virtual (b) real (c) diminished (d) upside-down

A ray of light travelling in glass emerges into air. State whether it will bend towards the normal or away from the normal.