16569 + Interview Questions in Physics

1.	A charge of 2×10−2 C moves at 30 revolutions per second in a circle of diameter 80 cm. The current linked with the circuit is:
Answer» A charge of $2 \times 10^{- 2}$ C moves at 30 revolutions per second in a circle of diameter 80 cm. The current linked with the circuit is:

Discussion

2.	A movable pulley system consists of two movable pulleys. If the minimum effort required for the load of 30kgf is 100N and effort moves by 60cm then calculate the
Answer» A movable pulley system consists of two movable pulleys. If the minimum effort required for the load of 30kgf is 100N and effort moves by 60cm then calculate the

Discussion

3.	What is the significance of building a dam in hydro power plants?
Answer» What is the significance of building a dam in hydro power plants?

Discussion

4.	Of the three connecting wires in a household circuit, two of the three wires are at the same potential. They are:
Answer» Of the three connecting wires in a household circuit, two of the three wires are at the same potential. They are:

Discussion

5.	Which of the following is a renewable source of energy?
Answer» Which of the following is a renewable source of energy?

Discussion

6.	Look at the figure given below, iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings. What happens to a compass at a particular point near the copper wire if the resistance of the circuit is increased?
Answer» Look at the figure given below, iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings. What happens to a compass at a particular point near the copper wire if the resistance of the circuit is increased?

6.

Look at the figure given below, iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings. What happens to a compass at a particular point near the copper wire if the resistance of the circuit is increased?

Answer»

Look at the figure given below, iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings. What happens to a compass at a particular point near the copper wire if the resistance of the circuit is increased?

Discussion

7.	What happens when voltmeter is connecconnected in series
Answer» What happens when voltmeter is connecconnected in series

Discussion

8.	Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame.
Answer» Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame.

Discussion

9.	Why does the sky appear blue from the earth's surface?
Answer» Why does the sky appear blue from the earth's surface?

Discussion

10.	A light year is a unit of
Answer» A light year is a unit of

Discussion

11.	The fusion reaction between which of the following is used in hydrogen bomb?
Answer» The fusion reaction between which of the following is used in hydrogen bomb?

Discussion

12.	Question 1 Which of the following can make a parallel beam of light when light from a point source is incident on it? (a) Concave mirror as well as convex lens (b) Convex mirror as well as concave lens (c) Two plane mirrors placed at 90° to each other (d) Concave mirror as well as concave lens
Answer» Question 1 Which of the following can make a parallel beam of light when light from a point source is incident on it? (a) Concave mirror as well as convex lens (b) Convex mirror as well as concave lens (c) Two plane mirrors placed at 90° to each other (d) Concave mirror as well as concave lens

Discussion

13.	Snell's law of refraction of light states that
Answer» Snell's law of refraction of light states that

Discussion

14.	Magnetic field due to current carrying conductor does not interact with-
Answer» Magnetic field due to current carrying conductor does not interact with-

Discussion

15.	Two plane mirrors are initially inclined at 30° to each other and they move apart with an addition of 30° till the angle becomes 120°. The object is in between and equidistant from the mirrors. Find the sum of all the images formed. (Mirrors are inclined symmetrically).
Answer» Two plane mirrors are initially inclined at 30° to each other and they move apart with an addition of 30° till the angle becomes 120°. The object is in between and equidistant from the mirrors. Find the sum of all the images formed. (Mirrors are inclined symmetrically).

Discussion

16.	Question 12 Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?
Answer» Question 12 Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

Discussion

17.	Certain wire has resistance of 10 Ohm. If it is stretched by 1/10th of its length, then its resistance is nearly:
Answer» Certain wire has resistance of 10 Ohm. If it is stretched by 1/10th of its length, then its resistance is nearly:

Discussion

18.	State the effect of presence of impurity on the melting point of ice. Give one use of it.
Answer» State the effect of presence of impurity on the melting point of ice. Give one use of it.

18.

State the effect of presence of impurity on the melting point of ice. Give one use of it.

Answer»

State the effect of presence of impurity on the melting point of ice. Give one use of it.

Discussion

19.	If Ram is facing west and he sees a rainbow in front of him then, in which direction most probably the Sun is?
Answer» If Ram is facing west and he sees a rainbow in front of him then, in which direction most probably the Sun is?

Discussion

20.	1 kg of ice at 0∘C is mixed with 1 kg of steam at 100∘C. What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = 3.36 × 105 J kg−1 and latent heat of vaporization of water = 2.26 × 106 J kg−1
Answer» 1 kg of ice at $0^{\circ} C$ is mixed with 1 kg of steam at $100^{\circ} C$ . What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = $3.36 \times 10^{5} J k g^{- 1}$ and latent heat of vaporization of water = $2.26 \times 10^{6} J k g^{- 1}$

Discussion

21.	Why solenoid is used to magnetise a piece of magnetic materials, like soft iron, when placed inside the coil?
Answer» Why solenoid is used to magnetise a piece of magnetic materials, like soft iron, when placed inside the coil?

Discussion

22.	With respect to air, the refractive index of a flint glass and alcohol is 1.65 and 1.36 respectively. The refractive index of the flint glass with respect to alcohol is_______.
Answer» With respect to air, the refractive index of a flint glass and alcohol is $1.65$ and $1.36$ respectively. The refractive index of the flint glass with respect to alcohol is_______.

Discussion

23.	A person is standing 1 km away from a source of the sound. If the velocity of sound in the medium is 200 m/s, then calculate the number of oscillations (approximately) that the sound wave makes before it reaches that person. The frequency of the sound is 500 Hz.
Answer» A person is standing $1 k m$ away from a source of the sound. If the velocity of sound in the medium is $200 m / s$ , then calculate the number of oscillations (approximately) that the sound wave makes before it reaches that person. The frequency of the sound is $500 H z$ .

Discussion

24.	If the critical angle for the total internal reflection from a medium to vacuum is 30°. The velocity of light in the medium is
Answer» If the critical angle for the total internal reflection from a medium to vacuum is $30 °$ . The velocity of light in the medium is

Discussion

25.	A decrease in atomic number is observed during
Answer» A decrease in atomic number is observed during

Discussion

26.	What will be the number of images formed by a lens formed by four different transparent materials?
Answer» What will be the number of images formed by a lens formed by four different transparent materials?

Discussion

27.	How is Rainbow formed? [2 MARKS]
Answer» How is Rainbow formed? [2 MARKS]

Discussion

28.	The main reason for the abundant coliform bacteria in the water of river Ganga is: (a) immersion of ashes of the dead into the river (b) washing of clothes on the banks of the river (c) discharge of industrial wastes into river water (d) disposal of unburnt corpses into river water
Answer» The main reason for the abundant coliform bacteria in the water of river Ganga is: (a) immersion of ashes of the dead into the river (b) washing of clothes on the banks of the river (c) discharge of industrial wastes into river water (d) disposal of unburnt corpses into river water

Discussion

29.	Iron does not burn but iron fillings do. Why?
Answer» Iron does not burn but iron fillings do. Why?

Discussion

30.	Arrange the following in the ascending order of their calorific values. a. Petrol b. Wood c. Diesel d. Soft coal
Answer» Arrange the following in the ascending order of their calorific values. a. Petrol b. Wood c. Diesel d. Soft coal

30.

Arrange the following in the ascending order of their calorific values. a. Petrol b. Wood c. Diesel d. Soft coal

Answer»

Arrange the following in the ascending order of their calorific values.

a. Petrol

b. Wood

c. Diesel

d. Soft coal

Discussion

31.	A force of 15 N is acting on a particle of mass 3 kg towards north and a force of 20 N is acting on another particle of mass 2 kg towards east. The acceleration of the centre of mass of the two particle system is
Answer» A force of 15 N is acting on a particle of mass 3 kg towards north and a force of 20 N is acting on another particle of mass 2 kg towards east. The acceleration of the centre of mass of the two particle system is

Discussion

32.	How would you connect two resistors in series? Draw a diagram. Calculate the total equivalent resistance.
Answer» How would you connect two resistors in series? Draw a diagram. Calculate the total equivalent resistance.

Discussion

33.	Gravitational acceleration on the surface of a planet is √611g, where g is the gravitational acceleration on the surface of the earth. The average mass density of the planet is 23 times that of the earth. If the escape speed on the surface of the earth is taken to be 11 kms−1, find the escape speed on the surface of the planet is . (km/s)
Answer» Gravitational acceleration on the surface of a planet is $\frac{\sqrt{6}}{11} g$ , where g is the gravitational acceleration on the surface of the earth. The average mass density of the planet is $\frac{2}{3}$ times that of the earth. If the escape speed on the surface of the earth is taken to be 11 $k m s^{- 1}$ , find the escape speed on the surface of the planet is . (km/s)

Discussion

34.	What is the effective resistance between A and B in the following circuit?
Answer» What is the effective resistance between A and B in the following circuit?

34.

What is the effective resistance between A and B in the following circuit?

Answer»

What is the effective resistance between A and B in the following circuit?

Discussion

35.	PQ (Double arrow ray) and PR (Single arrow ray) are two light rays emerging from the object P as shown in the figure below: The position of image of the object P when seen obliquely from above will be
Answer» PQ (Double arrow ray) and PR (Single arrow ray) are two light rays emerging from the object P as shown in the figure below: The position of image of the object P when seen obliquely from above will be

35.

PQ (Double arrow ray) and PR (Single arrow ray) are two light rays emerging from the object P as shown in the figure below: The position of image of the object P when seen obliquely from above will be

Answer»

PQ (Double arrow ray) and PR (Single arrow ray) are two light rays emerging from the object P as shown in the figure below:

The position of image of the object P when seen obliquely from above will be

Discussion

36.	In refraction of light through a rectangular glass slab, the emergent ray is parallel to the direction of the incident ray. Why?
Answer» In refraction of light through a rectangular glass slab, the emergent ray is parallel to the direction of the incident ray. Why?

Discussion

37.	Ram has a LED of resistance 10 Ω which will only light up if the current provided is 1A. Below 1A current it won’t light up, above that the LED will burst. He also has 10 two volt cells. Find out how many cells will Ram need to light up the LED?
Answer» Ram has a LED of resistance 10 Ω which will only light up if the current provided is 1A. Below 1A current it won’t light up, above that the LED will burst. He also has 10 two volt cells. Find out how many cells will Ram need to light up the LED?

Discussion

38.	Three masses 5kg, 2 Kg, and 7 Kg are aligned in a straight line as shown below, find the net gravitational force on 4 Kg?
Answer» Three masses 5kg, 2 Kg, and 7 Kg are aligned in a straight line as shown below, find the net gravitational force on 4 Kg?

38.

Three masses 5kg, 2 Kg, and 7 Kg are aligned in a straight line as shown below, find the net gravitational force on 4 Kg?

Answer»

Three masses 5kg, 2 Kg, and 7 Kg are aligned in a straight line as shown below, find the net gravitational force on 4 Kg?

Discussion

39.	What is the pole fuse? Write down its current rating.
Answer» What is the pole fuse? Write down its current rating.

39.

What is the pole fuse? Write down its current rating.

Answer»

What is the pole fuse? Write down its current rating.

Discussion

40.	Two bulbs A and B are marked as ‘A’ 60W, 220V & ‘B’ 100W, 220V are connected in parallel to 220 V source. Which of the two will glow brighter?
Answer» Two bulbs A and B are marked as ‘A’ 60W, 220V & ‘B’ 100W, 220V are connected in parallel to 220 V source. Which of the two will glow brighter?

Discussion

41.	The most important safety method used for protecting home appliances from short-circuiting or overloading is the use of _____
Answer» The most important safety method used for protecting home appliances from short-circuiting or overloading is the use of _____

Discussion

42.	Periodic time (T) of a satellite revolving above Earth’s surface at a height equal to the radius of Earth (R), is g = 9.8m/s2
Answer» Periodic time (T) of a satellite revolving above Earth’s surface at a height equal to the radius of Earth (R), is $g = 9.8 m / s^{2}$

Discussion

43.	A wire of resistance 2 Ω is stretched to double its length, such that its volume remains constant. What is the resistance of the stretched wire?
Answer» A wire of resistance $2 Ω$ is stretched to double its length, such that its volume remains constant. What is the resistance of the stretched wire?

Discussion

44.	What is minimum energy required to launch a satellite of mass m from the surface of the earth(radius = R) in a circular orbit at an altitude of 2R from the centre?
Answer» What is minimum energy required to launch a satellite of mass m from the surface of the earth(radius = R) in a circular orbit at an altitude of 2R from the centre?

Discussion

45.	A sound wave has a frequency of 1000 Hz and a wavelength of 34 cm. How long will it take to travel 1 km?
Answer» A sound wave has a frequency of $1000 H z$ and a wavelength of $34 c m$ . How long will it take to travel $1 k m$ ?

Discussion

46.	With which process are the following ancient structures associated? Kulhs, Eris, Surangams, Kattas, Pynes
Answer» With which process are the following ancient structures associated? Kulhs, Eris, Surangams, Kattas, Pynes

Discussion

47.	An oil – tanker explodes in the sea. At that instant, an aircraft and a submarine were present vertically above and below the oil – tanker respectively at equal distances from it. Find the ratio of the time taken by sound waves to reach them. (Speed of sound in air = 340 m/s. The speed of sound in seawater = 1520 m/s)
Answer» An oil – tanker explodes in the sea. At that instant, an aircraft and a submarine were present vertically above and below the oil – tanker respectively at equal distances from it. Find the ratio of the time taken by sound waves to reach them. (Speed of sound in air = 340 m/s. The speed of sound in seawater = 1520 m/s)

Discussion

48.	1 kg piece of copper is drawn into a wire 1 mm thick, and another 1 kg copper piece into a wire 2 mm thick. Compare the resistance of these wires.
Answer» 1 kg piece of copper is drawn into a wire 1 mm thick, and another 1 kg copper piece into a wire 2 mm thick. Compare the resistance of these wires.

Discussion

49.	Question 130(i) Investigating Solar System The table shows the average distance from each planet in our solar system to the Sun. PlanetDistance from Sun (km)Distance from Sun(km) Standard NotationEarth1496000001.496×108Jupiter778300000Mars227900000Mercury57900000Neptune4497000000Pluto5900000000Saturn1427000000Uranus2870000000Venus108200000 Complete the table by expressing the distance from each planet to the Sun in scientific notation.
Answer» Question 130(i) Investigating Solar System The table shows the average distance from each planet in our solar system to the Sun. $\begin{matrix} P l a n e t & D i s t a n c e f r o m S u n (k m) & D i s t a n c e f r o m S u n (k m) S t a n d a r d N o t a t i o n E a r t h & 149600000 & 1.496 \times 10^{8} J u p i t e r & 778300000 M a r s & 227900000 M e r c u r y & 57900000 N e p t u n e & 4497000000 P l u t o & 5900000000 S a t u r n & 1427000000 U r a n u s & 2870000000 V e n u s & 108200000 \end{matrix}$ Complete the table by expressing the distance from each planet to the Sun in scientific notation.

49.

Question 130(i) Investigating Solar System The table shows the average distance from each planet in our solar system to the Sun. PlanetDistance from Sun (km)Distance from Sun(km) Standard NotationEarth1496000001.496×108Jupiter778300000Mars227900000Mercury57900000Neptune4497000000Pluto5900000000Saturn1427000000Uranus2870000000Venus108200000 Complete the table by expressing the distance from each planet to the Sun in scientific notation.

Answer»

Question 130(i)

Investigating Solar System The table shows the average distance from each planet in our solar system to the Sun.

$\begin{matrix} P l a n e t & D i s t a n c e f r o m S u n (k m) & D i s t a n c e f r o m S u n (k m) S t a n d a r d N o t a t i o n E a r t h & 149600000 & 1.496 \times 10^{8} J u p i t e r & 778300000 M a r s & 227900000 M e r c u r y & 57900000 N e p t u n e & 4497000000 P l u t o & 5900000000 S a t u r n & 1427000000 U r a n u s & 2870000000 V e n u s & 108200000 \end{matrix}$

Complete the table by expressing the distance from each planet to the Sun in scientific notation.

Discussion

50.	Which one of the following is the correct expression for linear magnification for a lens?
Answer» Which one of the following is the correct expression for linear magnification for a lens?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A charge of 2×10−2 C moves at 30 revolutions per second in a circle of diameter 80 cm. The current linked with the circuit is:

A movable pulley system consists of two movable pulleys. If the minimum effort required for the load of 30kgf is 100N and effort moves by 60cm then calculate the

What is the significance of building a dam in hydro power plants?

Of the three connecting wires in a household circuit, two of the three wires are at the same potential. They are:

Which of the following is a renewable source of energy?

What happens when voltmeter is connecconnected in series

Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame.

Why does the sky appear blue from the earth's surface?

A light year is a unit of

The fusion reaction between which of the following is used in hydrogen bomb?

Question 1 Which of the following can make a parallel beam of light when light from a point source is incident on it? (a) Concave mirror as well as convex lens (b) Convex mirror as well as concave lens (c) Two plane mirrors placed at 90° to each other (d) Concave mirror as well as concave lens

Snell's law of refraction of light states that

Magnetic field due to current carrying conductor does not interact with-

Two plane mirrors are initially inclined at 30° to each other and they move apart with an addition of 30° till the angle becomes 120°. The object is in between and equidistant from the mirrors. Find the sum of all the images formed. (Mirrors are inclined symmetrically).

Question 12 Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

Certain wire has resistance of 10 Ohm. If it is stretched by 1/10th of its length, then its resistance is nearly:

State the effect of presence of impurity on the melting point of ice. Give one use of it.

If Ram is facing west and he sees a rainbow in front of him then, in which direction most probably the Sun is?

1 kg of ice at 0∘C is mixed with 1 kg of steam at 100∘C. What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = 3.36 × 105 J kg−1 and latent heat of vaporization of water = 2.26 × 106 J kg−1

Why solenoid is used to magnetise a piece of magnetic materials, like soft iron, when placed inside the coil?

With respect to air, the refractive index of a flint glass and alcohol is 1.65 and 1.36 respectively. The refractive index of the flint glass with respect to alcohol is_______.

A person is standing 1 km away from a source of the sound. If the velocity of sound in the medium is 200 m/s, then calculate the number of oscillations (approximately) that the sound wave makes before it reaches that person. The frequency of the sound is 500 Hz.

If the critical angle for the total internal reflection from a medium to vacuum is 30°. The velocity of light in the medium is

A decrease in atomic number is observed during

What will be the number of images formed by a lens formed by four different transparent materials?

How is Rainbow formed? [2 MARKS]

The main reason for the abundant coliform bacteria in the water of river Ganga is: (a) immersion of ashes of the dead into the river (b) washing of clothes on the banks of the river (c) discharge of industrial wastes into river water (d) disposal of unburnt corpses into river water

Iron does not burn but iron fillings do. Why?

Arrange the following in the ascending order of their calorific values. a. Petrol b. Wood c. Diesel d. Soft coal

A force of 15 N is acting on a particle of mass 3 kg towards north and a force of 20 N is acting on another particle of mass 2 kg towards east. The acceleration of the centre of mass of the two particle system is

How would you connect two resistors in series? Draw a diagram. Calculate the total equivalent resistance.

What is the effective resistance between A and B in the following circuit?

PQ (Double arrow ray) and PR (Single arrow ray) are two light rays emerging from the object P as shown in the figure below: The position of image of the object P when seen obliquely from above will be

In refraction of light through a rectangular glass slab, the emergent ray is parallel to the direction of the incident ray. Why?

Ram has a LED of resistance 10 Ω which will only light up if the current provided is 1A. Below 1A current it won’t light up, above that the LED will burst. He also has 10 two volt cells. Find out how many cells will Ram need to light up the LED?

Three masses 5kg, 2 Kg, and 7 Kg are aligned in a straight line as shown below, find the net gravitational force on 4 Kg?

What is the pole fuse? Write down its current rating.

Two bulbs A and B are marked as ‘A’ 60W, 220V &amp; ‘B’ 100W, 220V are connected in parallel to 220 V source. Which of the two will glow brighter?

The most important safety method used for protecting home appliances from short-circuiting or overloading is the use of _____

Periodic time (T) of a satellite revolving above Earth’s surface at a height equal to the radius of Earth (R), is g = 9.8m/s2

A wire of resistance 2 Ω is stretched to double its length, such that its volume remains constant. What is the resistance of the stretched wire?

What is minimum energy required to launch a satellite of mass m from the surface of the earth(radius = R) in a circular orbit at an altitude of 2R from the centre?

A sound wave has a frequency of 1000 Hz and a wavelength of 34 cm. How long will it take to travel 1 km?

With which process are the following ancient structures associated? Kulhs, Eris, Surangams, Kattas, Pynes

1 kg piece of copper is drawn into a wire 1 mm thick, and another 1 kg copper piece into a wire 2 mm thick. Compare the resistance of these wires.

Which one of the following is the correct expression for linear magnification for a lens?

Two bulbs A and B are marked as ‘A’ 60W, 220V & ‘B’ 100W, 220V are connected in parallel to 220 V source. Which of the two will glow brighter?