16569 + Interview Questions in Physics

1.	Focal length of a lens of power -2.0 D is ___ m.
Answer» Focal length of a lens of power -2.0 D is ___ m.

Discussion

2.	The masses of two planets are in the ratio 1: 2. Their radii are in the ratio 1: 2. The acceleration due to gravity on the planets is in the ratio.
Answer» The masses of two planets are in the ratio 1: 2. Their radii are in the ratio 1: 2. The acceleration due to gravity on the planets is in the ratio.

Discussion

3.	When an object is at distances x and y from a lens, a real image and a virtual image is formed respectively having same magnification. The focal length of the lens is
Answer» When an object is at distances x and y from a lens, a real image and a virtual image is formed respectively having same magnification. The focal length of the lens is

Discussion

4.	What do you understand by the term ‘Specific Latent Heat of Fusion of iron is 40000 Jkg-1’.
Answer» What do you understand by the term ‘Specific Latent Heat of Fusion of iron is 40000 Jkg^-1’.

Discussion

5.	A body of mass m is moving with velocity v. If P is the momentum associated with the body and K.E. is the kinetic energy. Then K.E. and P are related as:
Answer» A body of mass m is moving with velocity v. If P is the momentum associated with the body and K.E. is the kinetic energy. Then K.E. and P are related as:

Discussion

6.	Why in convex mirror only 2 cases are possible
Answer» Why in convex mirror only 2 cases are possible

Discussion

7.	Which of the following is an ohmic resistance? (a) LED (b) junction diode (c) Filament of a bulb (d) nichrome wire
Answer» Which of the following is an ohmic resistance? (a) LED (b) junction diode (c) Filament of a bulb (d) nichrome wire

Discussion

8.	Why is it advised to tie the luggage with a rope on the roof of the buses?
Answer» Why is it advised to tie the luggage with a rope on the roof of the buses?

Discussion

9.	A ray of light is incident on a glass plate at an angle of 60∘. If the reflected and the refracted rays are mutually perpendicular, then the refractive index of material is
Answer» A ray of light is incident on a glass plate at an angle of $60^{\circ}$ . If the reflected and the refracted rays are mutually perpendicular, then the refractive index of material is

Discussion

10.	Describe the flow of alternating current (AC) in an electrical circuit.
Answer» Describe the flow of alternating current (AC) in an electrical circuit.

Discussion

11.	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 $80 c m$ . The current linked with the circuit is

Discussion

12.	Relation between SI unit and CGS unit of force
Answer» Relation between SI unit and CGS unit of force

Discussion

13.	Is de Broglie wavelength dependent on charge of the material? what will the graphical representation of a graph b/w de Broglie wavelength v/s charge?
Answer» Is de Broglie wavelength dependent on charge of the material? what will the graphical representation of a graph b/w de Broglie wavelength v/s charge?

Discussion

14.	If the above bar magnet is broken along the middle line, then how many north poles and south poles will be formed?
Answer» If the above bar magnet is broken along the middle line, then how many north poles and south poles will be formed?

Discussion

15.	1 kilocalorie of heat is provided to a system. Calculate the equivalent joules of heat provided to it.239
Answer» 1 kilocalorie of heat is provided to a system. Calculate the equivalent joules of heat provided to it. 239

Discussion

16.	Which of the following options refers to Chipko Andolan?
Answer» Which of the following options refers to Chipko Andolan?

Discussion

17.	why can't we show north and south to a point formed by the intersection of two magnetic field lines? [we know that 2 magnetic lines of force cannot intersect each other]
Answer» why can't we show north and south to a point formed by the intersection of two magnetic field lines? [we know that 2 magnetic lines of force cannot intersect each other]

Discussion

18.	How Regulator controls the speed of Motor in the fan?
Answer» How Regulator controls the speed of Motor in the fan?

Discussion

19.	__ is the study of the production of very low temperature (below 123K) and the behavior of materials at those temperatures.
Answer» __ is the study of the production of very low temperature (below 123K) and the behavior of materials at those temperatures.

Discussion

20.	Identify the condition, which will form enlarged, virtual and erect image?
Answer» Identify the condition, which will form enlarged, virtual and erect image?

Discussion

21.	You have studied in your earlier classes that stars such as Sun produces their own heat and light. It is due to
Answer» You have studied in your earlier classes that stars such as Sun produces their own heat and light. It is due to

Discussion

22.	The radius of curvature of a concave mirror is 10cm. The image of the sun will be formed at a distance___ from the pole of the mirror.
Answer» The radius of curvature of a concave mirror is 10cm. The image of the sun will be formed at a distance___ from the pole of the mirror.

Discussion

23.	When two light rays intersect with each other in a medium like glass or water, will they form an image ?
Answer» When two light rays intersect with each other in a medium like glass or water, will they form an image ?

Discussion

24.	For a combination of lenses, the power of each lens is added to get the resultant power. P = P1 + P2. WHY?
Answer» For a combination of lenses, the power of each lens is added to get the resultant power. P = P1 + P2. WHY?

Discussion

25.	An ideal battery sends a current of 5 A in a resistor. When another resistor of value 10 Ω is connected in parallel, the current through the battery is increased to 6 A. Find the resistance of the first resistor.
Answer» An ideal battery sends a current of 5 A in a resistor. When another resistor of value 10 $Ω$ is connected in parallel, the current through the battery is increased to 6 A. Find the resistance of the first resistor.

Discussion

26.	Define (a) centre of curvature (b) radius of curvature (c) pole (d) principal axis, and (e) aperture, of a spherical mirror with the help of a labelled diagram.
Answer» Define (a) centre of curvature (b) radius of curvature (c) pole (d) principal axis, and (e) aperture, of a spherical mirror with the help of a labelled diagram.

Discussion

27.	Which of the following correctly shows the force acting between two positive charges?
Answer» Which of the following correctly shows the force acting between two positive charges?

Discussion

28.	State energy conversion that takes place during working of Electric toaster is
Answer» State energy conversion that takes place during working of Electric toaster is

Discussion

29.	A block of mass 300kg falling at 160m in 2s is used to lift a load of 900kgf. If the load rises up by 40m in same time then calculate
Answer» A block of mass 300kg falling at 160m in 2s is used to lift a load of 900kgf. If the load rises up by 40m in same time then calculate

Discussion

30.	Rakesh wanted to do the prism experiment, he took a prism and passed a monochromatic light through the prism. Which of the following phenomenon would he observe?
Answer» Rakesh wanted to do the prism experiment, he took a prism and passed a monochromatic light through the prism. Which of the following phenomenon would he observe?

Discussion

31.	(a) What is an electromagnet ? Describe the construction and working of a electromagnet with the help of a labelled diagram. (b) Explain why an electromagnet is called a temporary magnet. (c) Explain why the core of an electromagnet should be made of soft iron and not of steel. (d) State the factors on which the strength of an electromagnet depends. How does it depend on these factors ? (e) Write some of the important uses of electromagnets.
Answer» (a) What is an electromagnet ? Describe the construction and working of a electromagnet with the help of a labelled diagram. (b) Explain why an electromagnet is called a temporary magnet. (c) Explain why the core of an electromagnet should be made of soft iron and not of steel. (d) State the factors on which the strength of an electromagnet depends. How does it depend on these factors ? (e) Write some of the important uses of electromagnets.

31.

(a) What is an electromagnet ? Describe the construction and working of a electromagnet with the help of a labelled diagram. (b) Explain why an electromagnet is called a temporary magnet. (c) Explain why the core of an electromagnet should be made of soft iron and not of steel. (d) State the factors on which the strength of an electromagnet depends. How does it depend on these factors ? (e) Write some of the important uses of electromagnets.

Answer»

(a) What is an electromagnet ? Describe the construction and working of a electromagnet with the help of a labelled diagram.

(b) Explain why an electromagnet is called a temporary magnet.

(c) Explain why the core of an electromagnet should be made of soft iron and not of steel.

(d) State the factors on which the strength of an electromagnet depends. How does it depend on these factors ?

(e) Write some of the important uses of electromagnets.

Discussion

32.	Mass of a body is increased by 16 times. What should be done to the velocity to maintain the same KE?
Answer» Mass of a body is increased by 16 times. What should be done to the velocity to maintain the same KE?

Discussion

33.	Which one has larger wavelength, red or blue light?
Answer» Which one has larger wavelength, red or blue light?

Discussion

34.	What is energy? Explain conservation of energy with an example. [3 MARKS]
Answer» What is energy? Explain conservation of energy with an example. [3 MARKS]

Discussion

35.	What is the difference in the number of 35 AH batteries sold in 1993 and 1997?
Answer» What is the difference in the number of 35 AH batteries sold in 1993 and 1997?

Discussion

36.	The energy in petrol originally came from the sun. Explain how it got into petrol.
Answer» The energy in petrol originally came from the sun. Explain how it got into petrol.

Discussion

37.	Draw the diagrams to show the refraction of light from (i) air to glass, and (ii) glass to air. In each diagram, label the incident ray, refracted ray, the angle of incidence (i) and the angle of refraction (r).
Answer» Draw the diagrams to show the refraction of light from (i) air to glass, and (ii) glass to air. In each diagram, label the incident ray, refracted ray, the angle of incidence (i) and the angle of refraction (r).

Discussion

38.	Derive the value of 1 light year.
Answer» Derive the value of 1 light year.

Discussion

39.	The image formed by a convex lens is virtual when
Answer» The image formed by a convex lens is virtual when

Discussion

40.	Two fuse wires have ratings of 10A & 13A.
Answer» Two fuse wires have ratings of 10A & 13A.

Discussion

41.	A coin is kept at bottom of an empty beaker. A traveling microscope is focussed on the coin from the top, now water is poured into beaker up to a height of 10 cm. By what distance and in which direction should the microscope be moved to bring the coin again in focus
Answer» A coin is kept at bottom of an empty beaker. A traveling microscope is focussed on the coin from the top, now water is poured into beaker up to a height of $10 c m$ . By what distance and in which direction should the microscope be moved to bring the coin again in focus

Discussion

42.	Which of the following mirrors always forms a virtual and diminished image irrespective of object location?
Answer» Which of the following mirrors always forms a virtual and diminished image irrespective of object location?

Discussion

43.	An actinium (Ac) sample (A:227; Z:89) undergoes a series of α−β−α−γ emissions to attain stability. What is the final daughter nucleus formed in the reaction?
Answer» An actinium ( $Ac$ ) sample ( $A : 227; Z : 89$ ) undergoes a series of $α - β - α - γ$ emissions to attain stability. What is the final daughter nucleus formed in the reaction?

Discussion

44.	Which of the following affect torque?
Answer» Which of the following affect torque?

Discussion

45.	Where should an object be placed in front of a convex lens so as to obtain its real, inverted and magnified image ?
Answer» Where should an object be placed in front of a convex lens so as to obtain its real, inverted and magnified image ?

Discussion

46.	The speed of light in vacuum is ______.
Answer» The speed of light in vacuum is ______.

Discussion

47.	Focal length of relaxed eye is
Answer» Focal length of relaxed eye is

Discussion

48.	State the sign convention to measure the distances for a lens.
Answer» State the sign convention to measure the distances for a lens.

Discussion

49.	Why does the sky appear dark to an astronaut?
Answer» Why does the sky appear dark to an astronaut?

Discussion

50.	A uniform magnetic field exists in the plane of paper pointing from left to right as shown in the figure given below. In the field, an electron and a proton move as shown. The direction of force experienced by the proton and the electron are:
Answer» A uniform magnetic field exists in the plane of paper pointing from left to right as shown in the figure given below. In the field, an electron and a proton move as shown. The direction of force experienced by the proton and the electron are:

50.

A uniform magnetic field exists in the plane of paper pointing from left to right as shown in the figure given below. In the field, an electron and a proton move as shown. The direction of force experienced by the proton and the electron are:

Answer»

A uniform magnetic field exists in the plane of paper pointing from left to right as shown in the figure given below. In the field, an electron and a proton move as shown. The direction of force experienced by the proton and the electron are:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Focal length of a lens of power -2.0 D is ___ m.

The masses of two planets are in the ratio 1: 2. Their radii are in the ratio 1: 2. The acceleration due to gravity on the planets is in the ratio.

When an object is at distances x and y from a lens, a real image and a virtual image is formed respectively having same magnification. The focal length of the lens is

What do you understand by the term ‘Specific Latent Heat of Fusion of iron is 40000 Jkg-1’.

A body of mass m is moving with velocity v. If P is the momentum associated with the body and K.E. is the kinetic energy. Then K.E. and P are related as:

Why in convex mirror only 2 cases are possible

Which of the following is an ohmic resistance? (a) LED (b) junction diode (c) Filament of a bulb (d) nichrome wire

Why is it advised to tie the luggage with a rope on the roof of the buses?

A ray of light is incident on a glass plate at an angle of 60∘. If the reflected and the refracted rays are mutually perpendicular, then the refractive index of material is

Describe the flow of alternating current (AC) in an electrical circuit.

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

Relation between SI unit and CGS unit of force

Is de Broglie wavelength dependent on charge of the material? what will the graphical representation of a graph b/w de Broglie wavelength v/s charge?

If the above bar magnet is broken along the middle line, then how many north poles and south poles will be formed?

1 kilocalorie of heat is provided to a system. Calculate the equivalent joules of heat provided to it.239

Which of the following options refers to Chipko Andolan?

why can't we show north and south to a point formed by the intersection of two magnetic field lines? [we know that 2 magnetic lines of force cannot intersect each other]

How Regulator controls the speed of Motor in the fan?

__ is the study of the production of very low temperature (below 123K) and the behavior of materials at those temperatures.

Identify the condition, which will form enlarged, virtual and erect image?

You have studied in your earlier classes that stars such as Sun produces their own heat and light. It is due to

The radius of curvature of a concave mirror is 10cm. The image of the sun will be formed at a distance___ from the pole of the mirror.

When two light rays intersect with each other in a medium like glass or water, will they form an image ?

For a combination of lenses, the power of each lens is added to get the resultant power. P = P1 + P2. WHY?

An ideal battery sends a current of 5 A in a resistor. When another resistor of value 10 Ω is connected in parallel, the current through the battery is increased to 6 A. Find the resistance of the first resistor.

Define (a) centre of curvature (b) radius of curvature (c) pole (d) principal axis, and (e) aperture, of a spherical mirror with the help of a labelled diagram.

Which of the following correctly shows the force acting between two positive charges?

State energy conversion that takes place during working of Electric toaster is

A block of mass 300kg falling at 160m in 2s is used to lift a load of 900kgf. If the load rises up by 40m in same time then calculate

Rakesh wanted to do the prism experiment, he took a prism and passed a monochromatic light through the prism. Which of the following phenomenon would he observe?

Mass of a body is increased by 16 times. What should be done to the velocity to maintain the same KE?

Which one has larger wavelength, red or blue light?

What is energy? Explain conservation of energy with an example. [3 MARKS]

What is the difference in the number of 35 AH batteries sold in 1993 and 1997?

The energy in petrol originally came from the sun. Explain how it got into petrol.

Draw the diagrams to show the refraction of light from (i) air to glass, and (ii) glass to air. In each diagram, label the incident ray, refracted ray, the angle of incidence (i) and the angle of refraction (r).

Derive the value of 1 light year.

The image formed by a convex lens is virtual when

Two fuse wires have ratings of 10A &amp; 13A.

A coin is kept at bottom of an empty beaker. A traveling microscope is focussed on the coin from the top, now water is poured into beaker up to a height of 10 cm. By what distance and in which direction should the microscope be moved to bring the coin again in focus

Which of the following mirrors always forms a virtual and diminished image irrespective of object location?

An actinium (Ac) sample (A:227; Z:89) undergoes a series of α−β−α−γ emissions to attain stability. What is the final daughter nucleus formed in the reaction?

Which of the following affect torque?

Where should an object be placed in front of a convex lens so as to obtain its real, inverted and magnified image ?

The speed of light in vacuum is ______.

Focal length of relaxed eye is

State the sign convention to measure the distances for a lens.

Why does the sky appear dark to an astronaut?

A uniform magnetic field exists in the plane of paper pointing from left to right as shown in the figure given below. In the field, an electron and a proton move as shown. The direction of force experienced by the proton and the electron are:

Two fuse wires have ratings of 10A & 13A.