16569 + Interview Questions in Physics

1.	One of the following is not a direct stakeholder in the management (or conservation) of forests. This is: (a) the people who have paper mills. (b) the people who run the forest department (c) the people who campaign for the conservation of forests (d) the people who live in urban areas
Answer» One of the following is not a direct stakeholder in the management (or conservation) of forests. This is: (a) the people who have paper mills. (b) the people who run the forest department (c) the people who campaign for the conservation of forests (d) the people who live in urban areas

Discussion

2.	(a) What is meant by the "resistance of a conductor"? Write the relation between resistance, potential difference and current. (b) When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Calculate the value of the resistance of the resistor.
Answer» (a) What is meant by the "resistance of a conductor"? Write the relation between resistance, potential difference and current. (b) When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Calculate the value of the resistance of the resistor.

Discussion

3.	Why is a ray passing through 2f reflected back along the same path?
Answer» Why is a ray passing through 2f reflected back along the same path?

Discussion

4.	Which of the following is incorrect about echo?
Answer» Which of the following is incorrect about echo?

Discussion

5.	Power of a glass slab is...................
Answer» Power of a glass slab is...................

Discussion

6.	If we move a magnetic needle away from a straight wire carrying current then deflection of the needle
Answer» If we move a magnetic needle away from a straight wire carrying current then deflection of the needle

Discussion

7.	What energy conversion does take place in a generator when it is in use ?
Answer» What energy conversion does take place in a generator when it is in use ?

Discussion

8.	Choose the correct options for the statements given below: Statement 1: Hydrogen is not an efficient fuel. Statement 2: Hydrogen is not used as a household fuel.
Answer» Choose the correct options for the statements given below: Statement 1: Hydrogen is not an efficient fuel. Statement 2: Hydrogen is not used as a household fuel.

8.

Choose the correct options for the statements given below: Statement 1: Hydrogen is not an efficient fuel. Statement 2: Hydrogen is not used as a household fuel.

Answer»

Choose the correct options for the statements given below:

Statement 1: Hydrogen is not an efficient fuel.

Statement 2: Hydrogen is not used as a household fuel.

Discussion

9.	For the object placed between the optical centre and focus of a convex lens, the image is : (a) real and enlarged (b) real and diminished (c) virtual and enlarged (d) virtual and diminished.
Answer» For the object placed between the optical centre and focus of a convex lens, the image is : (a) real and enlarged (b) real and diminished (c) virtual and enlarged (d) virtual and diminished.

9.

For the object placed between the optical centre and focus of a convex lens, the image is : (a) real and enlarged (b) real and diminished (c) virtual and enlarged (d) virtual and diminished.

Answer»

For the object placed between the optical centre and focus of a convex lens, the image is :

(a) real and enlarged

(b) real and diminished

(c) virtual and enlarged

(d) virtual and diminished.

Discussion

10.	State two important uses of natural gas.
Answer» State two important uses of natural gas.

Discussion

11.	For a particular scissor, the length from the tip of the blade to the screw is 15 cm long and the length from the screw to the tip of the handle is 7.5 cm long.Find the mechanical advantage.
Answer» For a particular scissor, the length from the tip of the blade to the screw is 15 cm long and the length from the screw to the tip of the handle is 7.5 cm long.Find the mechanical advantage.

Discussion

12.	A boy weighing 600N was in a lift. The lift experienced a breakdown and started falling freely under the action of gravity, what would be the weight of the boy in the lift?
Answer» A boy weighing 600N was in a lift. The lift experienced a breakdown and started falling freely under the action of gravity, what would be the weight of the boy in the lift?

Discussion

13.	A point source of power 4W is placed 1m below the free surface of liquid whose refractive index is 2√3Find the rate of transfer of energy (in watt) from the liquid surface to air. Ignore any absorption or scattering of light energy.
Answer» A point source of power 4W is placed 1m below the free surface of liquid whose refractive index is $\frac{2}{\sqrt{3}}$ Find the rate of transfer of energy (in watt) from the liquid surface to air. Ignore any absorption or scattering of light energy.

Discussion

14.	Why is the use of wood as a fuel not advisable although wood is a renewable source of energy?
Answer» Why is the use of wood as a fuel not advisable although wood is a renewable source of energy?

Discussion

15.	The resistance in the circuit is 10 Ω. The operating voltage is fluctuating; the appliance in the circuit operates best at 4kW. What is the operating voltage?
Answer» The resistance in the circuit is 10 $Ω$ . The operating voltage is fluctuating; the appliance in the circuit operates best at 4kW. What is the operating voltage?

Discussion

16.	Explain the formation of rainbows.
Answer» Explain the formation of rainbows.

Discussion

17.	Two objects are in resonance,then:
Answer» Two objects are in resonance,then:

Discussion

18.	Choose the term from the following which include all others: coal, natural gas, fossil fuels, petroleum
Answer» Choose the term from the following which include all others: coal, natural gas, fossil fuels, petroleum

Discussion

19.	Define 1 Coulomb.
Answer» Define 1 Coulomb.

Discussion

20.	Riya's room has an air conditioner, an electric fan and a paper fan. She feels a bit hot but she does not want to waste electricity, then which one among the following options should she use?
Answer» Riya's room has an air conditioner, an electric fan and a paper fan. She feels a bit hot but she does not want to waste electricity, then which one among the following options should she use?

Discussion

21.	A ball is thrown upwards, which attains a height of 10 m and comes back to the same position. i What is the net distance? ii What is the net displacement?
Answer» A ball is thrown upwards, which attains a height of $10 m$ and comes back to the same position. $i$ What is the net distance? $i i$ What is the net displacement?

Discussion

22.	A beam of light propagating in medium A with an index of refraction n (A)passes across an interface into medium B with an index of refraction n(B). The angle of incidence is greater than the angle of refraction; v (A) and v(B) denotes the speed of light in A and B. Then which of the following is true?
Answer» A beam of light propagating in medium A with an index of refraction n (A)passes across an interface into medium B with an index of refraction n(B). The angle of incidence is greater than the angle of refraction; v (A) and v(B) denotes the speed of light in A and B. Then which of the following is true?

Discussion

23.	Complete the sentence : An a.c. generator changes the ....... energy to ...... energy.
Answer» Complete the sentence : An a.c. generator changes the ....... energy to ...... energy.

Discussion

24.	What determines the frequency of a.c. produced in a generator ?
Answer» What determines the frequency of a.c. produced in a generator ?

Discussion

25.	In an experiment of verification of Ohm's law, following observations are obtained. Potential difference V (in Volt)0.51.01.52.02.5Current I (in ampere)0.20.40.60.81.0 Draw a V- I graph and use this graph to find : (a) the potential difference V when the current I is 0.5 A, (b) the current I when the potential difference V is 0.75 V, (c) the resistance in circuit.
Answer» In an experiment of verification of Ohm's law, following observations are obtained. $\begin{matrix} Potential difference V (in Volt) & 0.5 & 1.0 & 1.5 & 2.0 & 2.5 Current I (in ampere) & 0.2 & 0.4 & 0.6 & 0.8 & 1.0 \end{matrix}$ Draw a V- I graph and use this graph to find : (a) the potential difference V when the current I is 0.5 A, (b) the current I when the potential difference V is 0.75 V, (c) the resistance in circuit.

Discussion

26.	Why are we not able to see the things clearly when we come out of a darkroom?
Answer» Why are we not able to see the things clearly when we come out of a darkroom?

Discussion

27.	In which of the following, scattering of light does not takes place?
Answer» In which of the following, scattering of light does not takes place?

Discussion

28.	If a ray passing through the focus hits the convex lens, where will it intersect the principal axis?
Answer» If a ray passing through the focus hits the convex lens, where will it intersect the principal axis?

Discussion

29.	Find the work done to transfer 1019 electrons from point A to B which are maintained at a potential diffrence of 5 volts.
Answer» Find the work done to transfer $10^{19}$ electrons from point A to B which are maintained at a potential diffrence of 5 volts.

Discussion

30.	Figure below shows the system is at rest initially with x = 0. A man and a woman both are initially at the extreme ends of the platform. The man and the woman start to move towards each other. Obtain an expression for the displacement 's' of the platform when the two meet in terms of the displacement 'x1' of the man relative to the platform.
Answer» Figure below shows the system is at rest initially with x = 0. A man and a woman both are initially at the extreme ends of the platform. The man and the woman start to move towards each other. Obtain an expression for the displacement 's' of the platform when the two meet in terms of the displacement ' $x_{1}$ ' of the man relative to the platform.

Discussion

31.	Why goggles (Sun glasses) have zero power even though their surfaces are curved?
Answer» Why goggles (Sun glasses) have zero power even though their surfaces are curved?

Discussion

32.	The magnetic force experienced by an electron moving with a velocity of 2775 km s−1 at an angle of 30∘ to a magentic field is 7.336×10−14 N. What is the strength of the magnetic field (in Tesla)? Given, the electron charge, e=1.6×10−19 C
Answer» The magnetic force experienced by an electron moving with a velocity of $2775 k m s^{- 1}$ at an angle of $30^{\circ}$ to a magentic field is $7.336 \times 10^{- 14} N$ . What is the strength of the magnetic field (in Tesla)? Given, the electron charge, $e = 1.6 \times 10^{- 19} C$

Discussion

33.	A ray of light is incident on a transparent glass slab of refractive index 1.62. If the reflected and refracted rays are mutually perpendicular, what is the angle of incidence?
Answer» A ray of light is incident on a transparent glass slab of refractive index 1.62. If the reflected and refracted rays are mutually perpendicular, what is the angle of incidence?

Discussion

34.	A ball is released from a height of 200 m with a velocity of 10 m/s. Find the landing velocity of the ball. [Take g=10 m/s2]
Answer» A ball is released from a height of $200 m$ with a velocity of $10 m/s$ . Find the landing velocity of the ball. [Take $g = 10 {m/s}^{2}$ ]

Discussion

35.	Electricity
Answer» Electricity

Discussion

36.	What fluid help reduce friction and facilitate movement between articular cartilages?
Answer» What fluid help reduce friction and facilitate movement between articular cartilages?

Discussion

37.	A light ray passing through focus hits a convex lens. After that, it hits another lens and finally passes through the principal axis. Which kind of lens is used? Note: Principal axis of both the lenses coincides.
Answer» A light ray passing through focus hits a convex lens. After that, it hits another lens and finally passes through the principal axis. Which kind of lens is used? Note: Principal axis of both the lenses coincides.

Discussion

38.	Name and state the action and reaction in the following cases: (i) Firing a bullet from a gun (ii) Hammering a nail (iii) A book lying on a table (iv) A moving rocket (v) A person walking on the floor
Answer» Name and state the action and reaction in the following cases: (i) Firing a bullet from a gun (ii) Hammering a nail (iii) A book lying on a table (iv) A moving rocket (v) A person walking on the floor

Discussion

39.	Question 19 Meena draws magnetic field lines of field close to the axis of a current carrying circular loop. As she moves away from the centre of the circular loop she observes that the lines keep on diverging. How will you explain her observation?
Answer» Question 19 Meena draws magnetic field lines of field close to the axis of a current carrying circular loop. As she moves away from the centre of the circular loop she observes that the lines keep on diverging. How will you explain her observation?

Discussion

40.	Explain twinkling of stars
Answer» Explain twinkling of stars

Discussion

41.	Which of the following statements does not represent ohm's law?and how? A) Current / Potential Difference = Constant B) Potential Difference / Current = Constant C) Potential Difference = Current x Resistance D) Current = Resistance x Potential Difference
Answer» Which of the following statements does not represent ohm's law?and how? A) Current / Potential Difference = Constant B) Potential Difference / Current = Constant C) Potential Difference = Current x Resistance D) Current = Resistance x Potential Difference

Discussion

42.	According to lens formula, the focal length (f) of a lens is given by: Object distance: u Image distance: v
Answer» According to lens formula, the focal length (f) of a lens is given by: Object distance: $u$ Image distance: $v$

Discussion

43.	The lower block of a 'block and tackle' pulley system must be of negligible weight.
Answer» The lower block of a 'block and tackle' pulley system must be of negligible weight.

Discussion

44.	Consider the following statements about jet streams: 1. Jet streams are important component of westerly flow which influences weather in north and northwestern India. 2.The jet streams are found mainly in the upper atmosphere or in troposphere. 3. Jet streams generally follow a straight path. 4. Jet streams are caused by a combination of a planet's rotation on its axis and atmospheric heating Choose the correct statements:
Answer» Consider the following statements about jet streams: 1. Jet streams are important component of westerly flow which influences weather in north and northwestern India. 2.The jet streams are found mainly in the upper atmosphere or in troposphere. 3. Jet streams generally follow a straight path. 4. Jet streams are caused by a combination of a planet's rotation on its axis and atmospheric heating Choose the correct statements:

44.

Consider the following statements about jet streams: 1. Jet streams are important component of westerly flow which influences weather in north and northwestern India. 2.The jet streams are found mainly in the upper atmosphere or in troposphere. 3. Jet streams generally follow a straight path. 4. Jet streams are caused by a combination of a planet's rotation on its axis and atmospheric heating Choose the correct statements:

Answer»

Consider the following statements about jet streams:

1. Jet streams are important component of westerly flow which influences weather in north and northwestern India.

2.The jet streams are found mainly in the upper atmosphere or in troposphere.

3. Jet streams generally follow a straight path.

4. Jet streams are caused by a combination of a planet's rotation on its axis and atmospheric heating

Choose the correct statements:

Discussion

45.	The pH of a river water sample as measured by pH paper is found to be 6. What does it tell us about water?
Answer» The pH of a river water sample as measured by pH paper is found to be 6. What does it tell us about water?

Discussion

46.	Proxima Centauri is the nearest known star to the Sun. It is situated at a distance of 4.24 light years from the Sun. How many kilometers is it away from the Sun?
Answer» Proxima Centauri is the nearest known star to the Sun. It is situated at a distance of 4.24 light years from the Sun. How many kilometers is it away from the Sun?

Discussion

47.	The only possibility of heat flow in a thermos flask is through its cork which is 75 cm2 in area and 5 cm thick. Its thermal conductivity is 0.0075 cal/cmsec∘ C. The outside temperature is 40∘ C and latent heat of ice is 80 cal g−1. Time taken by 500 g of ice at 0∘ C in the flask to melt into water at 0∘ C is
Answer» The only possibility of heat flow in a thermos flask is through its cork which is 75 $c m^{2}$ in area and 5 cm thick. Its thermal conductivity is 0.0075 cal/cm $s e c^{\circ} C$ . The outside temperature is $40^{\circ} C$ and latent heat of ice is 80 cal $g^{- 1}$ . Time taken by 500 g of ice at $0^{\circ} C$ in the flask to melt into water at $0^{\circ} C$ is

47.

The only possibility of heat flow in a thermos flask is through its cork which is 75 cm2 in area and 5 cm thick. Its thermal conductivity is 0.0075 cal/cmsec∘ C. The outside temperature is 40∘ C and latent heat of ice is 80 cal g−1. Time taken by 500 g of ice at 0∘ C in the flask to melt into water at 0∘ C is

Answer»

The only possibility of heat flow in a thermos flask is through its cork which is 75 $c m^{2}$ in area and 5 cm thick. Its thermal conductivity is 0.0075 cal/cm $s e c^{\circ} C$ . The outside temperature is $40^{\circ} C$ and latent heat of ice is 80 cal $g^{- 1}$ . Time taken by 500 g of ice at $0^{\circ} C$ in the flask to melt into water at $0^{\circ} C$ is

Discussion

48.	Liquid is filled in a vessel which is kept in a room with temperature 20∘ C. When the temperature of the liquid is 80∘ C, then it loses heat at the rate of 60 cal/sec. What will be the rate of loss of heat when the temperature of the liquid is 40∘ C
Answer» Liquid is filled in a vessel which is kept in a room with temperature $20^{\circ} C$ . When the temperature of the liquid is $80^{\circ} C$ , then it loses heat at the rate of 60 cal/sec. What will be the rate of loss of heat when the temperature of the liquid is $40^{\circ} C$

Discussion

49.	(a) Define resistivity. Write an expression for the resistivity of a substance. Give the meaning of each symbol which occurs in it. (b) State the SI unit of resistivity. (c) Distinguish between resistance and resistivity. (d) Name two factors on which the resistivity of a substance depends and two factors on which it does not depend. (e) The resistance of a metal wire for length 1 m is 26ohm at 20o C, If the diameter of the wire is 0.3 mm, what will be the resistivity of the metal at that temperature?
Answer» (a) Define resistivity. Write an expression for the resistivity of a substance. Give the meaning of each symbol which occurs in it. (b) State the SI unit of resistivity. (c) Distinguish between resistance and resistivity. (d) Name two factors on which the resistivity of a substance depends and two factors on which it does not depend. (e) The resistance of a metal wire for length $1 m$ is $26 o h m$ at $2 0^{o}$ C, If the diameter of the wire is $0.3 mm$ , what will be the resistivity of the metal at that temperature?

Discussion

50.	The non-renewable source of energy among the following is : (a) hydroelectricity (b) sewage gas (c) natural gas (d) gobar gas
Answer» The non-renewable source of energy among the following is : (a) hydroelectricity (b) sewage gas (c) natural gas (d) gobar gas

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

One of the following is not a direct stakeholder in the management (or conservation) of forests. This is: (a) the people who have paper mills. (b) the people who run the forest department (c) the people who campaign for the conservation of forests (d) the people who live in urban areas

(a) What is meant by the "resistance of a conductor"? Write the relation between resistance, potential difference and current. (b) When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Calculate the value of the resistance of the resistor.

Why is a ray passing through 2f reflected back along the same path?

Which of the following is incorrect about echo?

Power of a glass slab is...................

If we move a magnetic needle away from a straight wire carrying current then deflection of the needle

What energy conversion does take place in a generator when it is in use ?

Choose the correct options for the statements given below: Statement 1: Hydrogen is not an efficient fuel. Statement 2: Hydrogen is not used as a household fuel.

For the object placed between the optical centre and focus of a convex lens, the image is : (a) real and enlarged (b) real and diminished (c) virtual and enlarged (d) virtual and diminished.

State two important uses of natural gas.

For a particular scissor, the length from the tip of the blade to the screw is 15 cm long and the length from the screw to the tip of the handle is 7.5 cm long.Find the mechanical advantage.

A boy weighing 600N was in a lift. The lift experienced a breakdown and started falling freely under the action of gravity, what would be the weight of the boy in the lift?

A point source of power 4W is placed 1m below the free surface of liquid whose refractive index is 2√3Find the rate of transfer of energy (in watt) from the liquid surface to air. Ignore any absorption or scattering of light energy.

Why is the use of wood as a fuel not advisable although wood is a renewable source of energy?

The resistance in the circuit is 10 Ω. The operating voltage is fluctuating; the appliance in the circuit operates best at 4kW. What is the operating voltage?

Explain the formation of rainbows.

Two objects are in resonance,then:

Choose the term from the following which include all others: coal, natural gas, fossil fuels, petroleum

Define 1 Coulomb.

Riya's room has an air conditioner, an electric fan and a paper fan. She feels a bit hot but she does not want to waste electricity, then which one among the following options should she use?

A ball is thrown upwards, which attains a height of 10 m and comes back to the same position. i What is the net distance? ii What is the net displacement?

Complete the sentence : An a.c. generator changes the ....... energy to ...... energy.

What determines the frequency of a.c. produced in a generator ?

Why are we not able to see the things clearly when we come out of a darkroom?

In which of the following, scattering of light does not takes place?

If a ray passing through the focus hits the convex lens, where will it intersect the principal axis?

Find the work done to transfer 1019 electrons from point A to B which are maintained at a potential diffrence of 5 volts.

Why goggles (Sun glasses) have zero power even though their surfaces are curved?

The magnetic force experienced by an electron moving with a velocity of 2775 km s−1 at an angle of 30∘ to a magentic field is 7.336×10−14 N. What is the strength of the magnetic field (in Tesla)? Given, the electron charge, e=1.6×10−19 C

A ray of light is incident on a transparent glass slab of refractive index 1.62. If the reflected and refracted rays are mutually perpendicular, what is the angle of incidence?

A ball is released from a height of 200 m with a velocity of 10 m/s. Find the landing velocity of the ball. [Take g=10 m/s2]

Electricity

What fluid help reduce friction and facilitate movement between articular cartilages?

A light ray passing through focus hits a convex lens. After that, it hits another lens and finally passes through the principal axis. Which kind of lens is used? Note: Principal axis of both the lenses coincides.

Name and state the action and reaction in the following cases: (i) Firing a bullet from a gun (ii) Hammering a nail (iii) A book lying on a table (iv) A moving rocket (v) A person walking on the floor

Question 19 Meena draws magnetic field lines of field close to the axis of a current carrying circular loop. As she moves away from the centre of the circular loop she observes that the lines keep on diverging. How will you explain her observation?

Explain twinkling of stars

Which of the following statements does not represent ohm's law?and how? A) Current / Potential Difference = Constant B) Potential Difference / Current = Constant C) Potential Difference = Current x Resistance D) Current = Resistance x Potential Difference

According to lens formula, the focal length (f) of a lens is given by: Object distance: u Image distance: v

The lower block of a 'block and tackle' pulley system must be of negligible weight.

The pH of a river water sample as measured by pH paper is found to be 6. What does it tell us about water?

Proxima Centauri is the nearest known star to the Sun. It is situated at a distance of 4.24 light years from the Sun. How many kilometers is it away from the Sun?

Liquid is filled in a vessel which is kept in a room with temperature 20∘ C. When the temperature of the liquid is 80∘ C, then it loses heat at the rate of 60 cal/sec. What will be the rate of loss of heat when the temperature of the liquid is 40∘ C

The non-renewable source of energy among the following is : (a) hydroelectricity (b) sewage gas (c) natural gas (d) gobar gas