16569 + Interview Questions in Physics

1.	A ray of light travelling from medium I in which speed of light is 2×108 m/s to a medium II in which speed of light is 1.5×108 m/s. Choose the correct ray diagram: I. u=2×108 m/s II. v=1.5×108 m/s
Answer» A ray of light travelling from medium I in which speed of light is $2 \times 10^{8} m / s$ to a medium II in which speed of light is $1.5 \times 10^{8} m / s$ . Choose the correct ray diagram: I. $u = 2 \times 10^{8} m / s$ II. $v = 1.5 \times 10^{8} m / s$

1.

A ray of light travelling from medium I in which speed of light is 2×108 m/s to a medium II in which speed of light is 1.5×108 m/s. Choose the correct ray diagram: I. u=2×108 m/s II. v=1.5×108 m/s

Answer»

A ray of light travelling from medium I in which speed of light is $2 \times 10^{8} m / s$ to a medium II in which speed of light is $1.5 \times 10^{8} m / s$ . Choose the correct ray diagram:

I. $u = 2 \times 10^{8} m / s$

II. $v = 1.5 \times 10^{8} m / s$

Discussion

2.	If the temperature of the gas is increased, the velocity of molecules will
Answer» If the temperature of the gas is increased, the velocity of molecules will

Discussion

3.	Question 23 Select the eco-friendly activity among the following (a) Using car for transportation (b) Using poly bags for shopping (c) Using dyes for colouring clothes (d) Using windmills to generate power for irrigation
Answer» Question 23 Select the eco-friendly activity among the following (a) Using car for transportation (b) Using poly bags for shopping (c) Using dyes for colouring clothes (d) Using windmills to generate power for irrigation

Discussion

4.	The ray diagram given below illustrates the experimental set up for the determination of the focal length of a converging lens using an auxiliary mirror: The distance between the object and optical centre of the lens is
Answer» The ray diagram given below illustrates the experimental set up for the determination of the focal length of a converging lens using an auxiliary mirror: The distance between the object and optical centre of the lens is

4.

The ray diagram given below illustrates the experimental set up for the determination of the focal length of a converging lens using an auxiliary mirror: The distance between the object and optical centre of the lens is

Answer»

The ray diagram given below illustrates the experimental set up for the determination of the focal length of a converging lens using an auxiliary mirror:

The distance between the object and optical centre of the lens is

Discussion

5.	Question 7 We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.
Answer» Question 7 We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.

Discussion

6.	What is a lever? State its principle.
Answer» What is a lever? State its principle.

Discussion

7.	Question 20 Three 2 ~Ω resistors, A, B and C, are connected as shown in the figure. Each of them dissipates energy and can withstand a maximum power of 18 W without melting. Find the maximum current that can flow through the three resistors?
Answer» Question 20 Three 2 ~ $Ω$ resistors, A, B and C, are connected as shown in the figure. Each of them dissipates energy and can withstand a maximum power of 18 W without melting. Find the maximum current that can flow through the three resistors?

Discussion

8.	Two sounds of same loudness and same pitch produced by the two different instruments differ in their: (a) amplitudes (b) frequencies (c) wave forms (d) all the above.
Answer» Two sounds of same loudness and same pitch produced by the two different instruments differ in their: (a) amplitudes (b) frequencies (c) wave forms (d) all the above.

8.

Two sounds of same loudness and same pitch produced by the two different instruments differ in their: (a) amplitudes (b) frequencies (c) wave forms (d) all the above.

Answer»

Two sounds of same loudness and same pitch produced by the two different instruments differ in their:

(a) amplitudes (b) frequencies

(c) wave forms (d) all the above.

Discussion

9.	State Ohm's law and draw a neat labelled circuit diagram containing a battery, a key, a voltmeter, an ammeter, a rheostat and an unknown resistance to verify it.
Answer» State Ohm's law and draw a neat labelled circuit diagram containing a battery, a key, a voltmeter, an ammeter, a rheostat and an unknown resistance to verify it.

Discussion

10.	State any four characteristics of a good source of energy.
Answer» State any four characteristics of a good source of energy.

Discussion

11.	Why does sun appear yellowish-white at the noon?
Answer» Why does sun appear yellowish-white at the noon?

Discussion

12.	A resistor of 6 Ω is connected in series with another resistor of 4 Ω. A potential difference of 20 V is applied across the combination. Calculate: (a) the current in the circuit, and (b) the potential difference across the 6 Ω resistor.
Answer» A resistor of $6 Ω$ is connected in series with another resistor of $4 Ω$ . A potential difference of 20 V is applied across the combination. Calculate: (a) the current in the circuit, and (b) the potential difference across the $6 Ω$ resistor.

12.

A resistor of 6 Ω is connected in series with another resistor of 4 Ω. A potential difference of 20 V is applied across the combination. Calculate: (a) the current in the circuit, and (b) the potential difference across the 6 Ω resistor.

Answer»

A resistor of $6 Ω$ is connected in series with another resistor of $4 Ω$ . A potential difference of 20 V is applied across the combination. Calculate:

(a) the current in the circuit, and

(b) the potential difference across the $6 Ω$ resistor.

Discussion

13.	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

14.	Akhshay is a student of class 9. He was waiting for a bus on a bus stand. He saw an old man trying to keep his luggage on the roof of the bus and unable to do it. Akhshay picked up his luggage and placed it on the roof of the bus. The old man thanked Akshay for the same. What is the equation for work done against gravity?
Answer» Akhshay is a student of class 9. He was waiting for a bus on a bus stand. He saw an old man trying to keep his luggage on the roof of the bus and unable to do it. Akhshay picked up his luggage and placed it on the roof of the bus. The old man thanked Akshay for the same. What is the equation for work done against gravity?

Discussion

15.	Which among the following factors does not influence the increase in volume of solids?
Answer» Which among the following factors does not influence the increase in volume of solids?

Discussion

16.	The temperature and the dew point in an open room are 20∘C and 10∘C. If the room temperature drops to 15∘C, what will be the new dew point?
Answer» The temperature and the dew point in an open room are $20^{\circ} C$ and $10^{\circ} C$ . If the room temperature drops to $15^{\circ} C$ , what will be the new dew point?

Discussion

17.	Draw a ray diagram to show the refraction of light through a glass prism. On the diagram mark a) Incident angle b) emergent ray c) angle of deviation. [3 MARKS]
Answer» Draw a ray diagram to show the refraction of light through a glass prism. On the diagram mark a) Incident angle b) emergent ray c) angle of deviation. [3 MARKS]

17.

Draw a ray diagram to show the refraction of light through a glass prism. On the diagram mark a) Incident angle b) emergent ray c) angle of deviation. [3 MARKS]

Answer»

Draw a ray diagram to show the refraction of light through a glass prism.

On the diagram mark a) Incident angle b) emergent ray c) angle of deviation. [3 MARKS]

Discussion

18.	If Iron man’s particle accelerator has a radius 1π meters and 1011 electrons flow with 2×108 m/s speed in the anticlockwise direction. Then find the current in the circuit and also its direction.
Answer» If Iron man’s particle accelerator has a radius $\frac{1}{π}$ meters and $10^{11}$ electrons flow with $2 \times 10^{8}$ m/s speed in the anticlockwise direction. Then find the current in the circuit and also its direction.

18.

If Iron man’s particle accelerator has a radius 1π meters and 1011 electrons flow with 2×108 m/s speed in the anticlockwise direction. Then find the current in the circuit and also its direction.

Answer»

If Iron man’s particle accelerator has a radius $\frac{1}{π}$ meters and $10^{11}$ electrons flow with $2 \times 10^{8}$ m/s speed in the anticlockwise direction. Then find the current in the circuit and also its direction.

Discussion

19.	If 3.2 J of work is done in moving 0.4 C of charge, the potential difference across the circuit is .
Answer» If $3.2 J$ of work is done in moving $0.4 C$ of charge, the potential difference across the circuit is .

Discussion

20.	If x2−8x+13 can be written as (x – a)(x – 6) + 1. Find the value of a. __
Answer» If $x^{2} - 8 x + 13$ can be written as (x – a)(x – 6) + 1. Find the value of a. __

Discussion

21.	Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then in parallel in an electric circuit. The ratio of the heat produced in series and parallel combinations would be: [3 MARKS]
Answer» Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then in parallel in an electric circuit. The ratio of the heat produced in series and parallel combinations would be: [3 MARKS]

Discussion

22.	Which instrument do scientists often use to measure the amount of force?
Answer» Which instrument do scientists often use to measure the amount of force?

Discussion

23.	In the circuit diagram. Find (i) total resistance (ii) current shown by the ammeter A. [3 MARKS]
Answer» In the circuit diagram. Find (i) total resistance (ii) current shown by the ammeter A. [3 MARKS]

23.

In the circuit diagram. Find (i) total resistance (ii) current shown by the ammeter A. [3 MARKS]

Answer»

In the circuit diagram.

Find
(i) total resistance
(ii) current shown by the ammeter A. [3 MARKS]

Discussion

24.	Do Fuses Have High or Low Resistance and Why?
Answer» Do Fuses Have High or Low Resistance and Why?

Discussion

25.	Which among Iron and Mercury is a better conductor of electricity?
Answer» Which among Iron and Mercury is a better conductor of electricity?

Discussion

26.	Which of the following units is used to measure the thermal energy in a body?
Answer» Which of the following units is used to measure the thermal energy in a body?

Discussion

27.	(a) A coil of insulated wire is connected to a galvanometer. What would be seen if a bar magnet with its south pole towards one face of the coil is (i) moved quickly toward it (ii) moved quickly away from it (iii)placed near its one face. These activities are then repeated with north pole of the magnet. What will be the observations? (b) Name and define the phenomenon involved in above activities. (c) Name the rule which can determine the direction of current in each case.
Answer» (a) A coil of insulated wire is connected to a galvanometer. What would be seen if a bar magnet with its south pole towards one face of the coil is (i) moved quickly toward it (ii) moved quickly away from it (iii)placed near its one face. These activities are then repeated with north pole of the magnet. What will be the observations? (b) Name and define the phenomenon involved in above activities. (c) Name the rule which can determine the direction of current in each case.

Discussion

28.	A solenoid that is carrying current has magnetic field lines similar to a:
Answer» A solenoid that is carrying current has magnetic field lines similar to a:

Discussion

29.	Which law states that "A current will be produced in a conductor whenever there is a varying magnetic field over the conductor"?
Answer» Which law states that "A current will be produced in a conductor whenever there is a varying magnetic field over the conductor"?

Discussion

30.	Question 70 In the following question, state whether the given statements are true (T) or false (F). 329.25=3×102+2×101+9×100+2×10−1+5×10−2
Answer» Question 70 In the following question, state whether the given statements are true (T) or false (F). $329.25 = 3 \times 10^{2} + 2 \times 10^{1} + 9 \times 10^{0} + 2 \times 10^{- 1} + 5 \times 10^{- 2}$

30.

Question 70 In the following question, state whether the given statements are true (T) or false (F). 329.25=3×102+2×101+9×100+2×10−1+5×10−2

Answer»

Question 70

In the following question, state whether the given statements are true (T) or false (F).

$329.25 = 3 \times 10^{2} + 2 \times 10^{1} + 9 \times 10^{0} + 2 \times 10^{- 1} + 5 \times 10^{- 2}$

Discussion

31.	When light is incident on the surface of medium at angle i and refracted into a second medium at an angle r the graph of sin i vs sin r is as shown in the graph. From this, one can conclude that
Answer» When light is incident on the surface of medium at angle $i$ and refracted into a second medium at an angle $r$ the graph of $s i n i$ vs $s i n r$ is as shown in the graph. From this, one can conclude that

31.

When light is incident on the surface of medium at angle i and refracted into a second medium at an angle r the graph of sin i vs sin r is as shown in the graph. From this, one can conclude that

Answer»

When light is incident on the surface of medium at angle $i$ and refracted into a second medium at an angle $r$ the graph of $s i n i$ vs $s i n r$ is as shown in the graph. From this, one can conclude that

Discussion

32.	A tumbler, made purely of iron, can be filled with 500 ml (∼500cm3) of water during a spring temperature of 20∘C. How much water (in volume) can you store in the tumbler in autumn, if the temperature drops to 8∘C? (γFe = 33.3/∘C).
Answer» A tumbler, made purely of iron, can be filled with 500 ml ( $\sim 500 c m^{3}$ ) of water during a spring temperature of $20^{\circ} C$ . How much water (in volume) can you store in the tumbler in autumn, if the temperature drops to $8^{\circ} C$ ? ( $γ F e$ = $33.3$ $/^{\circ} C$ ).

Discussion

33.	The refractive indices of glass and water w.r.t. air are 3\2 & 4\3 respectively. If speed of light in glass is 2×10 to the power 8 find the speed of light in water.
Answer» The refractive indices of glass and water w.r.t. air are 3\2 & 4\3 respectively. If speed of light in glass is 2×10 to the power 8 find the speed of light in water.

Discussion

34.	In the problems when to use +ve singn when to use -ve singn in mirror sums
Answer» In the problems when to use +ve singn when to use -ve singn in mirror sums

Discussion

35.	Identify the component of the following hydropower plant that plays a key role in energy conversion.
Answer» Identify the component of the following hydropower plant that plays a key role in energy conversion.

Discussion

36.	An air-conditioner of 3.2 kW power rating is connected to a domestic electric circuit having a current rathing of 10 A. The voltage of power supply is 220 V. What will happen when this air-conditioner is switched on ? Explain your answer.
Answer» An air-conditioner of 3.2 kW power rating is connected to a domestic electric circuit having a current rathing of 10 A. The voltage of power supply is 220 V. What will happen when this air-conditioner is switched on ? Explain your answer.

Discussion

37.	Which of the following quantity has the unit of newton-second?
Answer» Which of the following quantity has the unit of newton-second?

Discussion

38.	Three resistors are connected to a 12 V battery as shown in the figure given below: The current through the 6 ohm resistor is:
Answer» Three resistors are connected to a 12 V battery as shown in the figure given below: The current through the 6 ohm resistor is:

38.

Three resistors are connected to a 12 V battery as shown in the figure given below: The current through the 6 ohm resistor is:

Answer»

Three resistors are connected to a 12 V battery as shown in the figure given below:

The current through the 6 ohm resistor is:

Discussion

39.	A ray OA is incident upon a smooth surface POQ. It is reflected back along OB, a normal ON is drawn perpendicular to the surface at O (the point of incidence) and the value of ∠AOP is 60∘. Find the value of x.
Answer» A ray OA is incident upon a smooth surface POQ. It is reflected back along OB, a normal ON is drawn perpendicular to the surface at O (the point of incidence) and the value of $∠ A O P$ is $60^{\circ}$ . Find the value of x.

Discussion

40.	(a) Explain the principle of an electric generator. (b) State two ways in which the current induced in the coil of a generator could be increased.
Answer» (a) Explain the principle of an electric generator. (b) State two ways in which the current induced in the coil of a generator could be increased.

40.

(a) Explain the principle of an electric generator. (b) State two ways in which the current induced in the coil of a generator could be increased.

Answer»

(a) Explain the principle of an electric generator.

(b) State two ways in which the current induced in the coil of a generator could be increased.

Discussion

41.	Mention the names of any five ancient water harvesting systems in India. [2 MARKS]
Answer» Mention the names of any five ancient water harvesting systems in India. [2 MARKS]

Discussion

42.	A trolley of mass 100g is given a velocity of 20cm/s with the help of a compressed spring. Calculate the PE stored in the compressed spring.
Answer» A trolley of mass 100g is given a velocity of 20cm/s with the help of a compressed spring. Calculate the PE stored in the compressed spring.

Discussion

43.	If a ray passing through the focus gets refracted by a convex lens, where will it intersect the principal axis?
Answer» If a ray passing through the focus gets refracted by a convex lens, where will it intersect the principal axis?

Discussion

44.	What can you see in a completely dark room ? If you switch on an electric bulb in this dark room as a light source, explain how you could now see : (a) the electric bulb. (b) a piece of white paper.
Answer» What can you see in a completely dark room ? If you switch on an electric bulb in this dark room as a light source, explain how you could now see : (a) the electric bulb. (b) a piece of white paper.

Discussion

45.	The "amount of electricity" as observed by Henry Cavendish is the quantity that we refer to today as
Answer» The "amount of electricity" as observed by Henry Cavendish is the quantity that we refer to today as

Discussion

46.	Which effect of current can be utilized in detecting a current carrying wire concealed in a wall?
Answer» Which effect of current can be utilized in detecting a current carrying wire concealed in a wall?

Discussion

47.	One calorie is equal to .
Answer» One calorie is equal to .

Discussion

48.	Radar is able to detect the reflected waves from an enemy aeroplane after a time interval of 0.02ms. If the velocity of the waves is 3 x 108ms-1, how far is the plane from the radar?
Answer» Radar is able to detect the reflected waves from an enemy aeroplane after a time interval of 0.02ms. If the velocity of the waves is 3 x 10⁸ms^-1, how far is the plane from the radar?

Discussion

49.	Masses of the three wires of same material are in the ratio of 1 : 2 : 3 and their lengths in the ratio of 3 : 2 : 1. Electrical resistance of these wires will be in the ratio of:
Answer» Masses of the three wires of same material are in the ratio of 1 : 2 : 3 and their lengths in the ratio of 3 : 2 : 1. Electrical resistance of these wires will be in the ratio of:

Discussion

50.	In Van der Waals equation of state of the gas law, the constant b is a measure of__.
Answer» In Van der Waals equation of state of the gas law, the constant b is a measure of__.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A ray of light travelling from medium I in which speed of light is 2×108 m/s to a medium II in which speed of light is 1.5×108 m/s. Choose the correct ray diagram: I. u=2×108 m/s II. v=1.5×108 m/s

If the temperature of the gas is increased, the velocity of molecules will

Question 23 Select the eco-friendly activity among the following (a) Using car for transportation (b) Using poly bags for shopping (c) Using dyes for colouring clothes (d) Using windmills to generate power for irrigation

The ray diagram given below illustrates the experimental set up for the determination of the focal length of a converging lens using an auxiliary mirror: The distance between the object and optical centre of the lens is

What is a lever? State its principle.

Question 20 Three 2 ~Ω resistors, A, B and C, are connected as shown in the figure. Each of them dissipates energy and can withstand a maximum power of 18 W without melting. Find the maximum current that can flow through the three resistors?

Two sounds of same loudness and same pitch produced by the two different instruments differ in their: (a) amplitudes (b) frequencies (c) wave forms (d) all the above.

State Ohm's law and draw a neat labelled circuit diagram containing a battery, a key, a voltmeter, an ammeter, a rheostat and an unknown resistance to verify it.

State any four characteristics of a good source of energy.

Why does sun appear yellowish-white at the noon?

A resistor of 6 Ω is connected in series with another resistor of 4 Ω. A potential difference of 20 V is applied across the combination. Calculate: (a) the current in the circuit, and (b) the potential difference across the 6 Ω resistor.

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

Which among the following factors does not influence the increase in volume of solids?

The temperature and the dew point in an open room are 20∘C and 10∘C. If the room temperature drops to 15∘C, what will be the new dew point?

Draw a ray diagram to show the refraction of light through a glass prism. On the diagram mark a) Incident angle b) emergent ray c) angle of deviation. [3 MARKS]

If Iron man’s particle accelerator has a radius 1π meters and 1011 electrons flow with 2×108 m/s speed in the anticlockwise direction. Then find the current in the circuit and also its direction.

If 3.2 J of work is done in moving 0.4 C of charge, the potential difference across the circuit is .

If x2−8x+13 can be written as (x – a)(x – 6) + 1. Find the value of a. __

Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then in parallel in an electric circuit. The ratio of the heat produced in series and parallel combinations would be: [3 MARKS]

Which instrument do scientists often use to measure the amount of force?

In the circuit diagram. Find (i) total resistance (ii) current shown by the ammeter A. [3 MARKS]

Do Fuses Have High or Low Resistance and Why?

Which among Iron and Mercury is a better conductor of electricity?

Which of the following units is used to measure the thermal energy in a body?

A solenoid that is carrying current has magnetic field lines similar to a:

Which law states that "A current will be produced in a conductor whenever there is a varying magnetic field over the conductor"?

Question 70 In the following question, state whether the given statements are true (T) or false (F). 329.25=3×102+2×101+9×100+2×10−1+5×10−2

When light is incident on the surface of medium at angle i and refracted into a second medium at an angle r the graph of sin i vs sin r is as shown in the graph. From this, one can conclude that

A tumbler, made purely of iron, can be filled with 500 ml (∼500cm3) of water during a spring temperature of 20∘C. How much water (in volume) can you store in the tumbler in autumn, if the temperature drops to 8∘C? (γFe = 33.3/∘C).

The refractive indices of glass and water w.r.t. air are 3\2 & 4\3 respectively. If speed of light in glass is 2×10 to the power 8 find the speed of light in water.

In the problems when to use +ve singn when to use -ve singn in mirror sums

Identify the component of the following hydropower plant that plays a key role in energy conversion.

An air-conditioner of 3.2 kW power rating is connected to a domestic electric circuit having a current rathing of 10 A. The voltage of power supply is 220 V. What will happen when this air-conditioner is switched on ? Explain your answer.

Which of the following quantity has the unit of newton-second?

Three resistors are connected to a 12 V battery as shown in the figure given below: The current through the 6 ohm resistor is:

A ray OA is incident upon a smooth surface POQ. It is reflected back along OB, a normal ON is drawn perpendicular to the surface at O (the point of incidence) and the value of ∠AOP is 60∘. Find the value of x.

(a) Explain the principle of an electric generator. (b) State two ways in which the current induced in the coil of a generator could be increased.

Mention the names of any five ancient water harvesting systems in India. [2 MARKS]

A trolley of mass 100g is given a velocity of 20cm/s with the help of a compressed spring. Calculate the PE stored in the compressed spring.

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

What can you see in a completely dark room ? If you switch on an electric bulb in this dark room as a light source, explain how you could now see : (a) the electric bulb. (b) a piece of white paper.

The "amount of electricity" as observed by Henry Cavendish is the quantity that we refer to today as

Which effect of current can be utilized in detecting a current carrying wire concealed in a wall?

One calorie is equal to .

Radar is able to detect the reflected waves from an enemy aeroplane after a time interval of 0.02ms. If the velocity of the waves is 3 x 108ms-1, how far is the plane from the radar?

Masses of the three wires of same material are in the ratio of 1 : 2 : 3 and their lengths in the ratio of 3 : 2 : 1. Electrical resistance of these wires will be in the ratio of:

In Van der Waals equation of state of the gas law, the constant b is a measure of__.