16569 + Interview Questions in Physics

1.	Will a rainbow form when sunlight is red (during sunset and sunrise)?
Answer» Will a rainbow form when sunlight is red (during sunset and sunrise)?

Discussion

2.	Find the value of r if I-1A and potential difference across PQ is 1V
Answer» Find the value of r if I-1A and potential difference across PQ is 1V

2.

Find the value of r if I-1A and potential difference across PQ is 1V

Answer»

Find the value of r if I-1A and potential difference across PQ is 1V

Discussion

3.	A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power ___ D.
Answer» A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power ___ D.

Discussion

4.	Why does the same enzyme not break down everything that we eat?
Answer» Why does the same enzyme not break down everything that we eat?

Discussion

5.	By using a compass needle describe how can you demonstrate that there is a magnetic field around a current carrying conductor.
Answer» By using a compass needle describe how can you demonstrate that there is a magnetic field around a current carrying conductor.

Discussion

6.	When magnetic field lines are close, the magnetic field is:
Answer» When magnetic field lines are close, the magnetic field is:

Discussion

7.	In a certain liquid, the velocity of light is found to be 2.50×108 ms−1. Find the absolute refractive index of that liquid.
Answer» In a certain liquid, the velocity of light is found to be $2.50 \times 10^{8} m s^{- 1}$ . Find the absolute refractive index of that liquid.

Discussion

8.	A small coil is introduced between the poles of an electromagnet so that its axis coincides with the magnetic field direction. The number of turns is n and the cross sectional area of the coil is A. When the coil turns through 180°about its diameter, the charge flowing through the coil is Q. The total resistance of the circuit is R. What is the magnitude of the magnetic induction?
Answer» A small coil is introduced between the poles of an electromagnet so that its axis coincides with the magnetic field direction. The number of turns is $n$ and the cross sectional area of the coil is $A$ . When the coil turns through $180 °$ about its diameter, the charge flowing through the coil is $Q$ . The total resistance of the circuit is $R$ . What is the magnitude of the magnetic induction?

Discussion

9.	what are the the chemical changes that take place to an iron bar if magnetised.? what will it's its configuration be? what is exactly happening when a magnet attracts another magnet or iron? do electromagnets have poles?what are exactly magnetic poles?
Answer» what are the the chemical changes that take place to an iron bar if magnetised.? what will it's its configuration be? what is exactly happening when a magnet attracts another magnet or iron? do electromagnets have poles?what are exactly magnetic poles?

Discussion

10.	Which of the following is a wrong description of the binding energy of a nucleus?
Answer» Which of the following is a wrong description of the binding energy of a nucleus?

Discussion

11.	Why anticlockwise motion is positive and clockiwse motion is negative
Answer» Why anticlockwise motion is positive and clockiwse motion is negative

Discussion

12.	A construction worker’s helmet slips and falls down when he is 78.4 m above the ground. He hears the sound of the helmet hitting the ground 4.23 seconds after it has slipped. Find the speed of sound in air. ( Acceleration due to gravity 9.8m/s2 )
Answer» A construction worker’s helmet slips and falls down when he is $78.4 m$ above the ground. He hears the sound of the helmet hitting the ground $4.23$ seconds after it has slipped. Find the speed of sound in air. ( Acceleration due to gravity $9.8 m / s^{2}$ )

Discussion

13.	Two masses m1 and m2 collide with each other. Before the collision, the velocities are u1 and u2 respectively. After the collision the velocities are v1 and v2. What is the final momentum after collision?
Answer» Two masses $m_{1}$ and $m_{2}$ collide with each other. Before the collision, the velocities are $u_{1}$ and $u_{2}$ respectively. After the collision the velocities are $v_{1}$ and $v_{2}$ . What is the final momentum after collision?

Discussion

14.	Define load and effort.
Answer» Define load and effort.

Discussion

15.	What is the principle of lever?
Answer» What is the principle of lever?

Discussion

16.	A wire is stretched by 10 percentage of its original length. Calculate the percentage change in its resistance.
Answer» A wire is stretched by 10 percentage of its original length. Calculate the percentage change in its resistance.

Discussion

17.	A student is observing a diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:
Answer» A student is observing a diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:

17.

A student is observing a diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:

Answer»

A student is observing a diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:

Discussion

18.	A coil having 12 turns is connected to a battery. The magnetic field at the axis of the helix will be greater compared to the magnetic field at the centre of a circular loop of the same radius carrying current. How and why? Please explain in simple words as I can't understand it in the app.
Answer» A coil having 12 turns is connected to a battery. The magnetic field at the axis of the helix will be greater compared to the magnetic field at the centre of a circular loop of the same radius carrying current. How and why? Please explain in simple words as I can't understand it in the app.

Discussion

19.	An insulated box containing a diatomic gas of molar mass M is moving with a velocity v. If the box is suddenly stopped, the resulting change in temperature is (R is the gas constant)
Answer» An insulated box containing a diatomic gas of molar mass $M$ is moving with a velocity $v$ . If the box is suddenly stopped, the resulting change in temperature is ( $R$ is the gas constant)

19.

An insulated box containing a diatomic gas of molar mass M is moving with a velocity v. If the box is suddenly stopped, the resulting change in temperature is (R is the gas constant)

Answer»

An insulated box containing a diatomic gas of molar mass $M$ is moving with a velocity $v$ . If the box is suddenly stopped, the resulting change in temperature is ( $R$ is the gas constant)

Discussion

20.	How is scattering of light different from dispersion ?give one example of natural phenomena based on each of these.
Answer» How is scattering of light different from dispersion ?give one example of natural phenomena based on each of these.

Discussion

21.	What is meant by saying that the potential difference between two points in 1V.
Answer» What is meant by saying that the potential difference between two points in 1V.

Discussion

22.	Question 13 A magnetic compass needle is placed in the plane of paper near point A as shown in Figure. In which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the deflection of the compass? Under what condition is the deflection maximum and why?
Answer» Question 13 A magnetic compass needle is placed in the plane of paper near point A as shown in Figure. In which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the deflection of the compass? Under what condition is the deflection maximum and why?

Discussion

23.	Statement 1: on a hot day a straight road from a distance appears wet. This happens because of refraction. Statement 2: on a hot day the air above the road in contact with the road is hotter and less dense therefore has less refractive index than the cool air above it. When light comes through denser medium to rarer medium(here cooler air to hotter air) it is internally reflected which makes the road appear wet and shiny.
Answer» Statement 1: on a hot day a straight road from a distance appears wet. This happens because of refraction. Statement 2: on a hot day the air above the road in contact with the road is hotter and less dense therefore has less refractive index than the cool air above it. When light comes through denser medium to rarer medium(here cooler air to hotter air) it is internally reflected which makes the road appear wet and shiny.

23.

Statement 1: on a hot day a straight road from a distance appears wet. This happens because of refraction. Statement 2: on a hot day the air above the road in contact with the road is hotter and less dense therefore has less refractive index than the cool air above it. When light comes through denser medium to rarer medium(here cooler air to hotter air) it is internally reflected which makes the road appear wet and shiny.

Answer»

Statement 1: on a hot day a straight road from a distance appears wet. This happens because of refraction.

Statement 2: on a hot day the air above the road in contact with the road is hotter and less dense therefore has less refractive index than the cool air above it. When light comes through denser medium to rarer medium(here cooler air to hotter air) it is internally reflected which makes the road appear wet and shiny.

Discussion

24.	A bulb of resistance 1 ohm is connected across a battery of 10 V. Find the power consumed.
Answer» A bulb of resistance 1 ohm is connected across a battery of 10 V. Find the power consumed.

Discussion

25.	Two sets A and B each of four bulbs are glowing in two separate rooms. When one of the bulbs in set A is fused, the other three bulbs also cease to glow. But in set B, when one bulb fuses, the other bulbs continue to glow. (i) Explain the difference between the two sets. (ii) Which set of arrangement is preferred in the housing circuit and why?
Answer» Two sets A and B each of four bulbs are glowing in two separate rooms. When one of the bulbs in set A is fused, the other three bulbs also cease to glow. But in set B, when one bulb fuses, the other bulbs continue to glow. (i) Explain the difference between the two sets. (ii) Which set of arrangement is preferred in the housing circuit and why?

25.

Two sets A and B each of four bulbs are glowing in two separate rooms. When one of the bulbs in set A is fused, the other three bulbs also cease to glow. But in set B, when one bulb fuses, the other bulbs continue to glow. (i) Explain the difference between the two sets. (ii) Which set of arrangement is preferred in the housing circuit and why?

Answer»

Two sets A and B each of four bulbs are glowing in two separate rooms. When one of the bulbs in set A is fused, the other three bulbs also cease to glow. But in set B, when one bulb fuses, the other bulbs continue to glow. (i) Explain the difference between the two sets. (ii) Which set of arrangement is preferred in the housing circuit and why?

Discussion

26.	What do you understand by the invisible spectrum ?
Answer» What do you understand by the invisible spectrum ?

Discussion

27.	What type of mirror could be used : (a) as a shaving mirror? (b) as a shop security mirror?
Answer» What type of mirror could be used : (a) as a shaving mirror? (b) as a shop security mirror?

Discussion

28.	If the magnification of a body of size 1 m is 2, what is the size of the image ?
Answer» If the magnification of a body of size 1 m is 2, what is the size of the image ?

Discussion

29.	When forces F1, F2, F3 are acting on a particle of mass m such that F2 and F3 are mutually perpendicular, then the particle remains stationary. If the force F1 is now removed then the magnitude acceleration of the particle is:
Answer» When forces $F_{1}$ , $F_{2}$ , $F_{3}$ are acting on a particle of mass m such that $F_{2}$ and $F_{3}$ are mutually perpendicular, then the particle remains stationary. If the force $F_{1}$ is now removed then the magnitude acceleration of the particle is:

Discussion

30.	In which of the following arrangements would the bulb glow?
Answer» In which of the following arrangements would the bulb glow?

Discussion

31.	What is solar energy?
Answer» What is solar energy?

Discussion

32.	“Resonance is a special case of forced vibration”. This is because
Answer» “Resonance is a special case of forced vibration”. This is because

Discussion

33.	Which of these steps when we incorporate in our life will helps us in consumption of resources in a sustainable manner.
Answer» Which of these steps when we incorporate in our life will helps us in consumption of resources in a sustainable manner.

Discussion

34.	What is the main difference in the wiring of an electric bulb and a socket for using an electric iron in a domestic electric circuit ? What is the reason for this difference ?
Answer» What is the main difference in the wiring of an electric bulb and a socket for using an electric iron in a domestic electric circuit ? What is the reason for this difference ?

Discussion

35.	There are 4 ions P, Q, R & S. P has the highest charge and the highest lattice energy among the given ions. What do you think can probably be the size of P?
Answer» There are 4 ions P, Q, R & S. P has the highest charge and the highest lattice energy among the given ions. What do you think can probably be the size of P?

Discussion

36.	Question 15 AB is a current carrying conductor in the plane of the paper as shown in Figure. What are the directions of magnetic fields produced by it at points P and Q? Given r1>r2, where will the strength of the magnetic field be larger?
Answer» Question 15 AB is a current carrying conductor in the plane of the paper as shown in Figure. What are the directions of magnetic fields produced by it at points P and Q? Given $r_{1} > r_{2}$ , where will the strength of the magnetic field be larger?

Discussion

37.	In refraction of light through a prism, the light ray: (a) suffers refraction only at one face of the prism (b) emerges out from the prism in a direction parallel to the incident ray (c) bends at both the surfaces of prism towards its base (d) bends at both the surfaces of prism opposite to its base
Answer» In refraction of light through a prism, the light ray: (a) suffers refraction only at one face of the prism (b) emerges out from the prism in a direction parallel to the incident ray (c) bends at both the surfaces of prism towards its base (d) bends at both the surfaces of prism opposite to its base

37.

In refraction of light through a prism, the light ray: (a) suffers refraction only at one face of the prism (b) emerges out from the prism in a direction parallel to the incident ray (c) bends at both the surfaces of prism towards its base (d) bends at both the surfaces of prism opposite to its base

Answer»

In refraction of light through a prism, the light ray:

(a) suffers refraction only at one face of the prism

(b) emerges out from the prism in a direction parallel to the incident ray

(c) bends at both the surfaces of prism towards its base

(d) bends at both the surfaces of prism opposite to its base

Discussion

38.	What will happen when a ray enters from glass to air medium?
Answer» What will happen when a ray enters from glass to air medium?

Discussion

39.	Statement 1: Charcoal is a better biomass than wood. Statement 2: Charcoal burns without flames, is comparatively smokeless and has higher heat generation.
Answer» Statement 1: Charcoal is a better biomass than wood. Statement 2: Charcoal burns without flames, is comparatively smokeless and has higher heat generation.

39.

Statement 1: Charcoal is a better biomass than wood. Statement 2: Charcoal burns without flames, is comparatively smokeless and has higher heat generation.

Answer»

Statement 1: Charcoal is a better biomass than wood.

Statement 2: Charcoal burns without flames, is comparatively smokeless and has higher heat generation.

Discussion

40.	The given figure shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark. Find the mechanical advantage of the lever.
Answer» The given figure shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark. Find the mechanical advantage of the lever.

40.

The given figure shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark. Find the mechanical advantage of the lever.

Answer»

The given figure shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark.

Find the mechanical advantage of the lever.

Discussion

41.	A projectile is projected with velocity kve in vertically upward direction from the ground into the space.(ve is escape velocity and k
Answer» A projectile is projected with velocity $k v_{e}$ in vertically upward direction from the ground into the space.( $v_{e}$ is escape velocity and k<1). If air resistance is considered to be negligible then the maximum height from the centre of earth to which it can go, will be : (R = radius of earth)

Discussion

42.	State three differences between heat and temperature.
Answer» State three differences between heat and temperature.

Discussion

43.	The fuel used in thermal power plants is:
Answer» The fuel used in thermal power plants is:

Discussion

44.	Biogas is formed by the action of ___ on the domestic waste in the absence of oxygen.
Answer» Biogas is formed by the action of ___ on the domestic waste in the absence of oxygen.

Discussion

45.	A manganese sheet of dimensions 20 cm×30 cm at 25 ∘C is heated to 75 ∘C, if the area of the sheet is increased by 0.72 cm2, what is the coefficient of superficial thermal expansion of manganese?
Answer» A manganese sheet of dimensions $20 cm \times 30 cm$ at $25^{\circ} C$ is heated to $75^{\circ} C$ , if the area of the sheet is increased by $0.72 {cm}^{2}$ , what is the coefficient of superficial thermal expansion of manganese?

Discussion

46.	A sound wave has a frequency of ν Hz and a wavelength of λ m. Its velocity is.
Answer» A sound wave has a frequency of ν Hz and a wavelength of λ m. Its velocity is.

Discussion

47.	Which of the following energy is produced from a non-sustainable source?
Answer» Which of the following energy is produced from a non-sustainable source?

Discussion

48.	Identify the condition, which will form a real, inverted and equal sized image of the object.
Answer» Identify the condition, which will form a real, inverted and equal sized image of the object.

Discussion

49.	Light scattering in colloidal particles is –
Answer» Light scattering in colloidal particles is –

Discussion

50.	There are two boxes A & B. Cell phones are kept in both the boxes, all air is sucked from box A and then closed by a device. While box B is simply closed by a device without sucking air from it. A call is made simultaneously from both the phones, but sound comes only from box B. This is because: Statement 1: In box A, there are air particles to vibrate and box B is a vacuum. Statement 2: Sound needs a medium for propagation.
Answer» There are two boxes A & B. Cell phones are kept in both the boxes, all air is sucked from box A and then closed by a device. While box B is simply closed by a device without sucking air from it. A call is made simultaneously from both the phones, but sound comes only from box B. This is because: Statement 1: In box A, there are air particles to vibrate and box B is a vacuum. Statement 2: Sound needs a medium for propagation.

50.

There are two boxes A & B. Cell phones are kept in both the boxes, all air is sucked from box A and then closed by a device. While box B is simply closed by a device without sucking air from it. A call is made simultaneously from both the phones, but sound comes only from box B. This is because: Statement 1: In box A, there are air particles to vibrate and box B is a vacuum. Statement 2: Sound needs a medium for propagation.

Answer»

There are two boxes A & B. Cell phones are kept in both the boxes, all air is sucked from box A and then closed by a device. While box B is simply closed by a device without sucking air from it. A call is made simultaneously from both the phones, but sound comes only from box B. This is because:

Statement 1: In box A, there are air particles to vibrate and box B is a vacuum.
Statement 2: Sound needs a medium for propagation.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Will a rainbow form when sunlight is red (during sunset and sunrise)?

Find the value of r if I-1A and potential difference across PQ is 1V

A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power ___ D.

Why does the same enzyme not break down everything that we eat?

By using a compass needle describe how can you demonstrate that there is a magnetic field around a current carrying conductor.

When magnetic field lines are close, the magnetic field is:

In a certain liquid, the velocity of light is found to be 2.50×108 ms−1. Find the absolute refractive index of that liquid.

what are the the chemical changes that take place to an iron bar if magnetised.? what will it's its configuration be? what is exactly happening when a magnet attracts another magnet or iron? do electromagnets have poles?what are exactly magnetic poles?

Which of the following is a wrong description of the binding energy of a nucleus?

Why anticlockwise motion is positive and clockiwse motion is negative

A construction worker’s helmet slips and falls down when he is 78.4 m above the ground. He hears the sound of the helmet hitting the ground 4.23 seconds after it has slipped. Find the speed of sound in air. ( Acceleration due to gravity 9.8m/s2 )

Two masses m1 and m2 collide with each other. Before the collision, the velocities are u1 and u2 respectively. After the collision the velocities are v1 and v2. What is the final momentum after collision?

Define load and effort.

What is the principle of lever?

A wire is stretched by 10 percentage of its original length. Calculate the percentage change in its resistance.

A student is observing a diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:

A coil having 12 turns is connected to a battery. The magnetic field at the axis of the helix will be greater compared to the magnetic field at the centre of a circular loop of the same radius carrying current. How and why? Please explain in simple words as I can't understand it in the app.

An insulated box containing a diatomic gas of molar mass M is moving with a velocity v. If the box is suddenly stopped, the resulting change in temperature is (R is the gas constant)

How is scattering of light different from dispersion ?give one example of natural phenomena based on each of these.

What is meant by saying that the potential difference between two points in 1V.

A bulb of resistance 1 ohm is connected across a battery of 10 V. Find the power consumed.

What do you understand by the invisible spectrum ?

What type of mirror could be used : (a) as a shaving mirror? (b) as a shop security mirror?

If the magnification of a body of size 1 m is 2, what is the size of the image ?

When forces F1, F2, F3 are acting on a particle of mass m such that F2 and F3 are mutually perpendicular, then the particle remains stationary. If the force F1 is now removed then the magnitude acceleration of the particle is:

In which of the following arrangements would the bulb glow?

What is solar energy?

“Resonance is a special case of forced vibration”. This is because

Which of these steps when we incorporate in our life will helps us in consumption of resources in a sustainable manner.

What is the main difference in the wiring of an electric bulb and a socket for using an electric iron in a domestic electric circuit ? What is the reason for this difference ?

There are 4 ions P, Q, R &amp; S. P has the highest charge and the highest lattice energy among the given ions. What do you think can probably be the size of P?

Question 15 AB is a current carrying conductor in the plane of the paper as shown in Figure. What are the directions of magnetic fields produced by it at points P and Q? Given r1&gt;r2, where will the strength of the magnetic field be larger?

What will happen when a ray enters from glass to air medium?

Statement 1: Charcoal is a better biomass than wood. Statement 2: Charcoal burns without flames, is comparatively smokeless and has higher heat generation.

The given figure shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark. Find the mechanical advantage of the lever.

A projectile is projected with velocity kve in vertically upward direction from the ground into the space.(ve is escape velocity and k

State three differences between heat and temperature.

The fuel used in thermal power plants is:

Biogas is formed by the action of ___ on the domestic waste in the absence of oxygen.

A manganese sheet of dimensions 20 cm×30 cm at 25 ∘C is heated to 75 ∘C, if the area of the sheet is increased by 0.72 cm2, what is the coefficient of superficial thermal expansion of manganese?

A sound wave has a frequency of ν Hz and a wavelength of λ m. Its velocity is.

Which of the following energy is produced from a non-sustainable source?

Identify the condition, which will form a real, inverted and equal sized image of the object.

Light scattering in colloidal particles is –

There are 4 ions P, Q, R & S. P has the highest charge and the highest lattice energy among the given ions. What do you think can probably be the size of P?

Question 15 AB is a current carrying conductor in the plane of the paper as shown in Figure. What are the directions of magnetic fields produced by it at points P and Q? Given r1>r2, where will the strength of the magnetic field be larger?