16569 + Interview Questions in Physics

1.	Determine the final result when 200 gm of water and 20 gm of ice at 0∘C are in a calorimeter having a water equivalent of 30 gm. 50 gm of steam is passed into it at 100∘C. Take latent heat of fusion 80 cal/gm and latent heat of vaporization as 540 cal/gm
Answer» Determine the final result when 200 gm of water and 20 gm of ice at $0^{\circ} C$ are in a calorimeter having a water equivalent of 30 gm. 50 gm of steam is passed into it at $100^{\circ} C$ . Take latent heat of fusion 80 cal/gm and latent heat of vaporization as 540 cal/gm

Discussion

2.	3. when an electricity is passed through a solution AlCl3 13.5 g of Al is drposited . The no of faraday must be?
Answer» 3. when an electricity is passed through a solution AlCl3 13.5 g of Al is drposited . The no of faraday must be?

Discussion

3.	Write expression for the magnifying power of a simple microscope. How can it be increased ?
Answer» Write expression for the magnifying power of a simple microscope. How can it be increased ?

Discussion

4.	The wavelength associated with an electron moving with velocity 1010 ms-1 is(1) 6.62 x 10-10 m(3) 3.69 x 10-12 m(2) 7.27 10-14 m(4) 4.92 x 10-11 m
Answer» The wavelength associated with an electron moving with velocity 1010 ms-1 is(1) 6.62 x 10-10 m(3) 3.69 x 10-12 m(2) 7.27 10-14 m(4) 4.92 x 10-11 m

Discussion

5.	3. It is said that bar magnet is equivalent to solenoid Even then in a solenoid B is max inside and min at ends but in bar magnet the situation is just opposite ,explain
Answer» 3. It is said that bar magnet is equivalent to solenoid Even then in a solenoid B is max inside and min at ends but in bar magnet the situation is just opposite ,explain

Discussion

6.	The refractive index of air with respect to glass is expressed as gμa = sinisinr if ∠ r = 90∘. What is the corresponding ∠i called?
Answer» The refractive index of air with respect to glass is expressed as $_{g} μ_{a}$ = $\frac{sin i}{sin r}$ if ∠ r = $90^{\circ}$ . What is the corresponding ∠i called?

Discussion

7.	Does incresing the magnitude of magnetic field affect the current induced, if we do not change the shape or do not move the loop?
Answer» Does incresing the magnitude of magnetic field affect the current induced, if we do not change the shape or do not move the loop?

Discussion

8.	A uniform electric field of intensity 200 N/C is present directed along the positive x-direction. The potential difference between points P (2 m, 3 m) and Q (5 m, 6 m), VP – VQ is
Answer» A uniform electric field of intensity 200 N/C is present directed along the positive x-direction. The potential difference between points P (2 m, 3 m) and Q (5 m, 6 m), VP – VQ is

Discussion

9.	A uniform rod of mass m and length l rotates in a horizontal plane with an angular velocity ω about a vertical axis passing through one end. The tension in the rod at a distance x from the axis is
Answer» A uniform rod of mass m and length l rotates in a horizontal plane with an angular velocity ω about a vertical axis passing through one end. The tension in the rod at a distance x from the axis is

Discussion

10.	A ray of light is incident on one of the faces of prism with an angle 40° with the surface. The angle of the prism is 60°. The emergent ray is deviated through an angle 38°. The angle of emergence is?
Answer» A ray of light is incident on one of the faces of prism with an angle 40° with the surface. The angle of the prism is 60°. The emergent ray is deviated through an angle 38°. The angle of emergence is?

Discussion

11.	Question 3Calculate the number of electrons constituting one coulomb of charge.
Answer» Question 3 Calculate the number of electrons constituting one coulomb of charge.

Discussion

12.	A terrestrial telescope is constructed by using two convex lenses of focal length 100 cm and 4 cm. If the final image obtained is 50 cm away from the eyepiece. Find the length of the telescope (approximately).
Answer» A terrestrial telescope is constructed by using two convex lenses of focal length $100 cm$ and $4 cm$ . If the final image obtained is $50 cm$ away from the eyepiece. Find the length of the telescope (approximately).

Discussion

13.	A dentist uses a mirror in front of a decayed tooth at a distance of 4cm from the tooth to get a 4 times magnified image. Use mirror formula to find the focal length of the mirror used. Is m=+4 or m= -4? How do we know?
Answer» A dentist uses a mirror in front of a decayed tooth at a distance of 4cm from the tooth to get a 4 times magnified image. Use mirror formula to find the focal length of the mirror used. Is m=+4 or m= -4? How do we know?

Discussion

14.	The gibbs free energy of formation of MO and CO at temperature 1000 ∘C and 1900 ∘C are given.2M+O2→2MO ;ΔG1900 ∘C=−300 kJ/mol ΔG1000 ∘C=−921 kJ/mol2C+O2→2CO ;ΔG1900 ∘C=−624 kJ/mol ΔG1000 ∘C=−423 kJ/molMO+CΔ→M+CO↑The reaction is feasible at temperature x∘C then what is the value of x500:
Answer» The gibbs free energy of formation of $M O$ and $C O$ at temperature $1000^{\circ} C$ and $1900^{\circ} C$ are given. $2 M + O_{2} \to 2 M O; Δ G_{1900^{\circ} C} = - 300 kJ/mol$ $Δ G_{1000^{\circ} C} = - 921 kJ/mol$ $2 C + O_{2} \to 2 C O; Δ G_{1900^{\circ} C} = - 624 kJ/mol$ $Δ G_{1000^{\circ} C} = - 423 kJ/mol$ $M O + C Δ \to M + C O ↑$ The reaction is feasible at temperature $x^{\circ} C$ then what is the value of $\frac{x}{500}$ :

Discussion

15.	A lead storage battery containing 5.0L of H2SO4 solution is operated for 9.65×105s with a steady current of 100 mA. Assuming volume of the solution remains constant, normality of H2SO4 will :
Answer» A lead storage battery containing 5.0L of $H_{2} S O_{4}$ solution is operated for $9.65 \times 10^{5} s$ with a steady current of 100 mA. Assuming volume of the solution remains constant, normality of $H_{2} S O_{4}$ will :

Discussion

16.	The figure given below shows a point object and a converging lens. The final image is formed at
Answer» The figure given below shows a point object and a converging lens. The final image is formed at

Discussion

17.	The electric meter in a house records the consumption of : (a) charge (b) current (c) energy (d) power.
Answer» The electric meter in a house records the consumption of : (a) charge (b) current (c) energy (d) power.

17.

The electric meter in a house records the consumption of : (a) charge (b) current (c) energy (d) power.

Answer»

The electric meter in a house records the consumption of :

(a) charge

(b) current

(c) energy

(d) power.

Discussion

18.	A TV set shoots out a beam of electrons. The beam current is 10 A. How many electrons strike the TV screen in a minute?
Answer» A TV set shoots out a beam of electrons. The beam current is 10 A. How many electrons strike the TV screen in a minute?

Discussion

19.	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

20.	A planet of mass m moves in an elliptical path around the Sun so that its maximum and minimum distance from the sun are equal to r1 and r2 respectively. Find the angular momentum of this planet relative to the center of the sun. Mass of the sun is M.
Answer» A planet of mass $m$ moves in an elliptical path around the Sun so that its maximum and minimum distance from the sun are equal to $r_{1}$ and $r_{2}$ respectively. Find the angular momentum of this planet relative to the center of the sun. Mass of the sun is $M$ .

Discussion

21.	The SI unit of resistivity is:
Answer» The SI unit of resistivity is:

Discussion

22.	State the condition at which total internal reflection occurs.
Answer» State the condition at which total internal reflection occurs.

Discussion

23.	An Electron is moving in the sameplane as a circular current carrying wire.Find the direction of deflection of the electron.
Answer» An Electron is moving in the same plane as a circular current carrying wire. Find the direction of deflection of the electron.

23.

An Electron is moving in the sameplane as a circular current carrying wire.Find the direction of deflection of the electron.

Answer» An Electron is moving in the same
plane as a circular current carrying wire.

Find the direction of deflection of the electron.

Discussion

24.	20.The reduced mass of two particles having masses m and 2m is ?
Answer» 20.The reduced mass of two particles having masses m and 2m is ?

Discussion

25.	What would happen if number of carnivorous decrease in an ecosystem
Answer» What would happen if number of carnivorous decrease in an ecosystem

Discussion

26.	Even though insulators conducts a little electricity why do we get a shock when standing in a tiled floor during a lightning even though the tile we are standing on is an insulator.
Answer» Even though insulators conducts a little electricity why do we get a shock when standing in a tiled floor during a lightning even though the tile we are standing on is an insulator.

Discussion

27.	For the same angle of incidence, the angles of refraction in media P, Q and R are 35∘, 25∘, 15∘ respectively. In which medium will the velocity of light be minimum?
Answer» For the same angle of incidence, the angles of refraction in media P, Q and R are $35^{\circ}$ , $25^{\circ}$ , $15^{\circ}$ respectively. In which medium will the velocity of light be minimum?

Discussion

28.	On the Celsius scale the absolute zero of temperature is at
Answer» On the Celsius scale the absolute zero of temperature is at

Discussion

29.	what kind of system does a soda cane represent
Answer» what kind of system does a soda cane represent

Discussion

30.	Fill in the blanks: (a) Longer line in the symbol for a cell represents its ______ terminal.(b) The combination of two or more cells is called as ______.(c) When current is switched 'on' in a room heater, it ______.(d) The safety device based on the heating effect of electric current is called a ________.
Answer» Fill in the blanks: (a) Longer line in the symbol for a cell represents its ______ terminal. (b) The combination of two or more cells is called as ______. (c) When current is switched 'on' in a room heater, it ______. (d) The safety device based on the heating effect of electric current is called a ________.

Discussion

31.	The turns ratio of a transformer is 15 and the primary AC voltage is 9 V. What is the secondary voltage of the coil?
Answer» The turns ratio of a transformer is 15 and the primary AC voltage is 9 V. What is the secondary voltage of the coil?

Discussion

32.	Determine angle of deviation due to refraction at Air-Water interface as shown in the figure below (take sin37∘=35)
Answer» Determine angle of deviation due to refraction at Air-Water interface as shown in the figure below $(take sin 37^{\circ} = \frac{3}{5})$

Discussion

33.	The diagram shows a coil connected to a centre zero galvanometer G the galvanometer shows a deflection to the right when the N - Pole of a powerful magnet is moved the the right as shown: State the observation in G when, both the coil and the magent, are moved to the right at the same speed.
Answer» The diagram shows a coil connected to a centre zero galvanometer G the galvanometer shows a deflection to the right when the N - Pole of a powerful magnet is moved the the right as shown: State the observation in G when, both the coil and the magent, are moved to the right at the same speed.

33.

The diagram shows a coil connected to a centre zero galvanometer G the galvanometer shows a deflection to the right when the N - Pole of a powerful magnet is moved the the right as shown: State the observation in G when, both the coil and the magent, are moved to the right at the same speed.

Answer»

The diagram shows a coil connected to a centre zero galvanometer G the galvanometer shows a deflection to the right when the N - Pole of a powerful magnet is moved the the right as shown:

State the observation in G when, both the coil and the magent, are moved to the right at the same speed.

Discussion

34.

Column-I gives some devices and Column-II gives some processes on which the functioning of these devices depend. Match the devices in Column-I with the processes in Column-II and indicates your answer by darkening appropriate bubbles in the 4 × 4 matrix given in the ORS. Column-I Column-II (p) Bimetallic strip (a) Radiation from a hot body (q) Steam engine (b) Energy conversion (r) Incandescent lamp (c) Melting (s) Electric fuse (d) Thermal expansion of solids

Answer»

Column-I gives some devices and Column-II gives some processes on which the functioning of these devices depend. Match the devices in Column-I with the processes in Column-II and indicates your answer by darkening appropriate bubbles in the 4 $\times$ 4 matrix given in the ORS.

Column-I	Column-II
(p) Bimetallic strip	(a) Radiation from a hot body
(q) Steam engine	(b) Energy conversion
(r) Incandescent lamp	(c) Melting
(s) Electric fuse	(d) Thermal expansion of solids

Discussion

35.	Read the poem silently and answer the following questions: (a) List out the adjectives that have been used to describe the mirror. Add a few more adjectives to the list. (b) In the second stanza why has the narrator replaced the mirror with a lake? What is he/she trying to focus on?
Answer» Read the poem silently and answer the following questions: (a) List out the adjectives that have been used to describe the mirror. Add a few more adjectives to the list. (b) In the second stanza why has the narrator replaced the mirror with a lake? What is he/she trying to focus on?

35.

Read the poem silently and answer the following questions: (a) List out the adjectives that have been used to describe the mirror. Add a few more adjectives to the list. (b) In the second stanza why has the narrator replaced the mirror with a lake? What is he/she trying to focus on?

Answer»

Read
the poem silently and answer the following questions:

(a)
List out the adjectives that have been used to describe the mirror.
Add a few more adjectives to the list.

(b)
In the second stanza why has the narrator replaced the mirror with a
lake? What is he/she trying to focus on?

Discussion

36.	Why the electrons in nucleus do not get attracted by protons but revolve around nucleus.
Answer» Why the electrons in nucleus do not get attracted by protons but revolve around nucleus.

Discussion

37.	Which will have maximum number of nodes? a. σ2s b. σ^{\ast }2s c. π^\ast 2p_y d. π 2p_{
Answer» Which will have maximum number of nodes? a. σ2s b. σ^{\ast }2s c. π^\ast 2p_y d. π 2p_{

Discussion

38.	What is responsible for heating the water at the surface of the ocean more than the water at the depth?
Answer» What is responsible for heating the water at the surface of the ocean more than the water at the depth?

Discussion

39.	What is multimeter
Answer» What is multimeter

Discussion

40.	The equivalent resistance of a circuit that has two equal resistors in series is 8 Ω. Find the value of each resistor.
Answer» The equivalent resistance of a circuit that has two equal resistors in series is $8 Ω$ . Find the value of each resistor.

Discussion

41.	The refractive index of glass with respect to water is 98. Refractive index of glass with respect to air is 32. The refractive index of water with respect to air will be:
Answer» The refractive index of glass with respect to water is $\frac{9}{8}$ . Refractive index of glass with respect to air is $\frac{3}{2}$ . The refractive index of water with respect to air will be:

Discussion

42.	A solenoid is used as a temporary magnet (an electromagnet). Why is a soft iron core preferred as compared to steel core?
Answer» A solenoid is used as a temporary magnet (an electromagnet). Why is a soft iron core preferred as compared to steel core?

Discussion

43.	Sam throws a stone of mass 0.5 kg in the upward direction from the ground with a velocity of 10 ms−1. Calculate the kinetic energy and mechanical energy of the stone when it reaches (4/5)th of its maximum height.Take g = 10 ms−2.
Answer» Sam throws a stone of mass 0.5 kg in the upward direction from the ground with a velocity of 10 ms $^{- 1}$ . Calculate the kinetic energy and mechanical energy of the stone when it reaches (4/5)th of its maximum height. Take g = 10 ms $^{- 2}$ .

Discussion

44.	An earthquake produces which type of sound wave before the main shock wave begins?
Answer» An earthquake produces which type of sound wave before the main shock wave begins?

Discussion

45.	Question 10Identify the Mg2+ ion from the figure where, n and p represent the number of neutrons and protons respectively.
Answer» Question 10 Identify the $M g^{2 +}$ ion from the figure where, n and p represent the number of neutrons and protons respectively.

Discussion

46.	A ray of light from denser medium strikes a rarer medium. The reflected and refracted rays make an angle of 90 degree with each other. The angles of reflection and refraction are r and r'. The critical angle would be
Answer» A ray of light from denser medium strikes a rarer medium. The reflected and refracted rays make an angle of 90 degree with each other. The angles of reflection and refraction are r and r'. The critical angle would be

Discussion

47.	What is "gobar-gas"?
Answer» What is "gobar-gas"?

Discussion

48.	60. A particle of charge per unit mass alpha is released from origin with a velocity v=vo icap in a uniform magnetic field B=-Bo kcap.If the particle passes through (0,y,0) then y is equal to
Answer» 60. A particle of charge per unit mass alpha is released from origin with a velocity v=vo icap in a uniform magnetic field B=-Bo kcap.If the particle passes through (0,y,0) then y is equal to

Discussion

49.	A light of wavelength 6400 armstrong is incident normally on a glass slab of thickness 5 cm its wavelength in glass is 4000 armstrong the beam of light takes the same time to travel from the source to the incident surface as it takes to travel through the glass slab Calculate the dis†an ce of source from the incident surfac
Answer» A light of wavelength 6400 armstrong is incident normally on a glass slab of thickness 5 cm its wavelength in glass is 4000 armstrong the beam of light takes the same time to travel from the source to the incident surface as it takes to travel through the glass slab Calculate the dis†an ce of source from the incident surfac

Discussion

50.	Current through wire XY of circuit shown is
Answer» Current through wire $XY$ of circuit shown is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Determine the final result when 200 gm of water and 20 gm of ice at 0∘C are in a calorimeter having a water equivalent of 30 gm. 50 gm of steam is passed into it at 100∘C. Take latent heat of fusion 80 cal/gm and latent heat of vaporization as 540 cal/gm

3. when an electricity is passed through a solution AlCl3 13.5 g of Al is drposited . The no of faraday must be?

Write expression for the magnifying power of a simple microscope. How can it be increased ?

The wavelength associated with an electron moving with velocity 1010 ms-1 is(1) 6.62 x 10-10 m(3) 3.69 x 10-12 m(2) 7.27 10-14 m(4) 4.92 x 10-11 m

3. It is said that bar magnet is equivalent to solenoid Even then in a solenoid B is max inside and min at ends but in bar magnet the situation is just opposite ,explain

The refractive index of air with respect to glass is expressed as gμa​ = sinisinr if ∠ r = 90∘​. What is the corresponding ∠i called?

Does incresing the magnitude of magnetic field affect the current induced, if we do not change the shape or do not move the loop?

A uniform electric field of intensity 200 N/C is present directed along the positive x-direction. The potential difference between points P (2 m, 3 m) and Q (5 m, 6 m), VP – VQ is

A uniform rod of mass m and length l rotates in a horizontal plane with an angular velocity ω about a vertical axis passing through one end. The tension in the rod at a distance x from the axis is

A ray of light is incident on one of the faces of prism with an angle 40° with the surface. The angle of the prism is 60°. The emergent ray is deviated through an angle 38°. The angle of emergence is?

Question 3Calculate the number of electrons constituting one coulomb of charge.

A terrestrial telescope is constructed by using two convex lenses of focal length 100 cm and 4 cm. If the final image obtained is 50 cm away from the eyepiece. Find the length of the telescope (approximately).

A dentist uses a mirror in front of a decayed tooth at a distance of 4cm from the tooth to get a 4 times magnified image. Use mirror formula to find the focal length of the mirror used. Is m=+4 or m= -4? How do we know?

A lead storage battery containing 5.0L of H2SO4 solution is operated for 9.65×105s with a steady current of 100 mA. Assuming volume of the solution remains constant, normality of H2SO4 will :

The figure given below shows a point object and a converging lens. The final image is formed at

The electric meter in a house records the consumption of : (a) charge (b) current (c) energy (d) power.

A TV set shoots out a beam of electrons. The beam current is 10 A. How many electrons strike the TV screen in a minute?

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

A planet of mass m moves in an elliptical path around the Sun so that its maximum and minimum distance from the sun are equal to r1 and r2 respectively. Find the angular momentum of this planet relative to the center of the sun. Mass of the sun is M.

The SI unit of resistivity is:

State the condition at which total internal reflection occurs.

An Electron is moving in the sameplane as a circular current carrying wire.Find the direction of deflection of the electron.

20.The reduced mass of two particles having masses m and 2m is ?

What would happen if number of carnivorous decrease in an ecosystem

Even though insulators conducts a little electricity why do we get a shock when standing in a tiled floor during a lightning even though the tile we are standing on is an insulator.

For the same angle of incidence, the angles of refraction in media P, Q and R are 35∘, 25∘, 15∘ respectively. In which medium will the velocity of light be minimum?

On the Celsius scale the absolute zero of temperature is at

what kind of system does a soda cane represent

The turns ratio of a transformer is 15 and the primary AC voltage is 9 V. What is the secondary voltage of the coil?

Determine angle of deviation due to refraction at Air-Water interface as shown in the figure below (take sin37∘=35)

The diagram shows a coil connected to a centre zero galvanometer G the galvanometer shows a deflection to the right when the N - Pole of a powerful magnet is moved the the right as shown: State the observation in G when, both the coil and the magent, are moved to the right at the same speed.

Read the poem silently and answer the following questions: (a) List out the adjectives that have been used to describe the mirror. Add a few more adjectives to the list. (b) In the second stanza why has the narrator replaced the mirror with a lake? What is he/she trying to focus on?

Why the electrons in nucleus do not get attracted by protons but revolve around nucleus.

Which will have maximum number of nodes? a. σ2s b. σ^{\ast }2s c. π^\ast 2p_y d. π 2p_{

What is responsible for heating the water at the surface of the ocean more than the water at the depth?

What is multimeter

The equivalent resistance of a circuit that has two equal resistors in series is 8 Ω. Find the value of each resistor.

The refractive index of glass with respect to water is 98. Refractive index of glass with respect to air is 32. The refractive index of water with respect to air will be:

A solenoid is used as a temporary magnet (an electromagnet). Why is a soft iron core preferred as compared to steel core?

Sam throws a stone of mass 0.5 kg in the upward direction from the ground with a velocity of 10 ms−1. Calculate the kinetic energy and mechanical energy of the stone when it reaches (4/5)th of its maximum height.Take g = 10 ms−2.

An earthquake produces which type of sound wave before the main shock wave begins?

Question 10Identify the Mg2+ ion from the figure where, n and p represent the number of neutrons and protons respectively.

A ray of light from denser medium strikes a rarer medium. The reflected and refracted rays make an angle of 90 degree with each other. The angles of reflection and refraction are r and r'. The critical angle would be

What is "gobar-gas"?

60. A particle of charge per unit mass alpha is released from origin with a velocity v=vo icap in a uniform magnetic field B=-Bo kcap.If the particle passes through (0,y,0) then y is equal to

Current through wire XY of circuit shown is

The refractive index of air with respect to glass is expressed as gμa = sinisinr if ∠ r = 90∘. What is the corresponding ∠i called?