16569 + Interview Questions in Physics

1.	A one metre long metallic rod is rotated with an angular frequency of 400 radian/s about an axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallic ring. A constant uniform magnetic field of0.5 tesla parallel to the axis exists everywhere. The emf developed between the centre and the ring is(2) 100 V(4) 1000 V(1) 200 V(3) 50 V
Answer» A one metre long metallic rod is rotated with an angular frequency of 400 radian/s about an axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallic ring. A constant uniform magnetic field of0.5 tesla parallel to the axis exists everywhere. The emf developed between the centre and the ring is(2) 100 V(4) 1000 V(1) 200 V(3) 50 V

Discussion

2.	If the value of resistance is 10.845 Ω and the value of current is 3.23 A. The value of potential difference with significant numbers is
Answer» If the value of resistance is 10.845 Ω and the value of current is 3.23 A. The value of potential difference with significant numbers is

Discussion

3.	The current density in a conducting medium is given by →J=40ρ2+1^az mA/m2.The net current crossing the circular disc (0<ρ<5m) in z = 2 plane is _____mA.(Answer upto 2 decimal places)409.42
Answer» The current density in a conducting medium is given by $\to J = \frac{40}{ρ^{2} + 1}_{z} m A / m^{2} .$ The net current crossing the circular disc $(0 < ρ < 5 m)$ in z = 2 plane is _____mA.(Answer upto 2 decimal places) 409.42

Discussion

4.	A piece of wire is cut into four equal parts and the pieces are bundled together side by side to form a thickerwire. Compared with that of the original wire, the resistance of the bundle is
Answer» A piece of wire is cut into four equal parts and the pieces are bundled together side by side to form a thicker wire. Compared with that of the original wire, the resistance of the bundle is

Discussion

5.	A telescope has an objective lens of focal length 200 cm and an eyepiece with focal length 2 cm. If this telescope is used to see a 50 m tall building at a distance of 2 km, what is the height of the image of the building formed by the objective lens ?
Answer» A telescope has an objective lens of focal length $200 cm$ and an eyepiece with focal length $2 cm$ . If this telescope is used to see a $50 m$ tall building at a distance of $2 km$ , what is the height of the image of the building formed by the objective lens ?

Discussion

6.	Assertion:- At the top of vertical short solonoid having time varying current a small conducting ring horizontally placed just above the end of the solenoid. The ring can float at certain height above the coil. Reason :- In the above situation, induced current in the ring will interact with horizontal component of magnetic field to produce an average force in upward direction
Answer» Assertion:- At the top of vertical short solonoid having time varying current a small conducting ring horizontally placed just above the end of the solenoid. The ring can float at certain height above the coil. Reason :- In the above situation, induced current in the ring will interact with horizontal component of magnetic field to produce an average force in upward direction

Discussion

7.	Name the wave which is used for taking photographs in the dark.
Answer» Name the wave which is used for taking photographs in the dark.

7.

Name the wave which is used for taking photographs in the dark.

Answer»

Name the wave which is used for taking photographs in the dark.

Discussion

8.	In a rocket, fuel burns at the rate of 2 kg/s. This fuel gets ejected from the rocket with a velocity of 80 km/s. Force exerted on the rocket is?
Answer» In a rocket, fuel burns at the rate of 2 kg/s. This fuel gets ejected from the rocket with a velocity of 80 km/s. Force exerted on the rocket is?

Discussion

9.	A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is propotional to: _________
Answer» A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is propotional to: _________

Discussion

10.	In the line 'And as he slowly drew up, snake-easing his shoulders, and entered farther' the phrase snake easing' his shoulders means (a) loosening its shoulders (b) slipping in with majestic grace (c) moving slowly (d) moving fast
Answer» In the line 'And as he slowly drew up, snake-easing his shoulders, and entered farther' the phrase snake easing' his shoulders means (a) loosening its shoulders (b) slipping in with majestic grace (c) moving slowly (d) moving fast

10.

In the line 'And as he slowly drew up, snake-easing his shoulders, and entered farther' the phrase snake easing' his shoulders means (a) loosening its shoulders (b) slipping in with majestic grace (c) moving slowly (d) moving fast

Answer»

In the line 'And
as he slowly drew up, snake-easing his shoulders, and entered
farther' the
phrase snake
easing' his
shoulders means

(a)
loosening its shoulders

(b)
slipping in with majestic grace

(c)
moving slowly

(d)
moving fast

Discussion

11.	Is compression in longitudinal wave is antinode?
Answer» Is compression in longitudinal wave is antinode?

Discussion

12.	A particular type of high energy invisible electromagnetic rays help us to study the structure of crystals. The radiation is
Answer» A particular type of high energy invisible electromagnetic rays help us to study the structure of crystals. The radiation is

Discussion

13.	A magnifying glass forms : (a) a real and diminished image (b) a real and magnified image (c) a virtual and magnified image (d) a virtual and diminished image.
Answer» A magnifying glass forms : (a) a real and diminished image (b) a real and magnified image (c) a virtual and magnified image (d) a virtual and diminished image.

13.

A magnifying glass forms : (a) a real and diminished image (b) a real and magnified image (c) a virtual and magnified image (d) a virtual and diminished image.

Answer»

A magnifying glass forms :

(a) a real and diminished image

(b) a real and magnified image

(c) a virtual and magnified image

(d) a virtual and diminished image.

Discussion

14.	One surface of a biconvex lens having focal length 40 cm is silvered. The radius of the curvature of the other surface is 60 cm. At what distance the silvered lens should an object be placed to obtain a real image magnified three times ?(Refractive index of lens, μL=1.5)
Answer» One surface of a biconvex lens having focal length $40 cm$ is silvered. The radius of the curvature of the other surface is $60 cm$ . At what distance the silvered lens should an object be placed to obtain a real image magnified three times ? $(Refractive index of lens, μL=1.5)$

Discussion

15.	If the refractive indices of alcohol and benzene with respect to air are 1.36 and 1.50 respectively,then the refractive index of benzene with respect to alcohol is
Answer» If the refractive indices of alcohol and benzene with respect to air are 1.36 and 1.50 respectively,then the refractive index of benzene with respect to alcohol is

Discussion

16.	Meaning of shrill
Answer» Meaning of shrill

Discussion

17.	The heats of combustion of rhombic and monoclinic sulphur are respectively 70960 and 71030 calories. What will be the heat of conversion of rhombic sulphur to monoclinic ? (a) 70960 calories (b) 71030 calories (c) -70 calories (d) +70 calories.
Answer» The heats of combustion of rhombic and monoclinic sulphur are respectively 70960 and 71030 calories. What will be the heat of conversion of rhombic sulphur to monoclinic ? (a) 70960 calories (b) 71030 calories (c) -70 calories (d) +70 calories.

Discussion

18.	When sound waves travel from a rarer gaseous medium to a denser gaseous medium, its speed __.
Answer» When sound waves travel from a rarer gaseous medium to a denser gaseous medium, its speed __.

Discussion

19.	Number of electrons in a charge of 16 C will be
Answer» Number of electrons in a charge of 16 C will be

Discussion

20.	A gas at 0∘ is heated. Both its pressure and volume increases twice the initial value. Find the final temperature of the gas.
Answer» A gas at $0^{\circ}$ is heated. Both its pressure and volume increases twice the initial value. Find the final temperature of the gas.

Discussion

21.	What is the principal of electrolytic refinig
Answer» What is the principal of electrolytic refinig

Discussion

22.	What is thermit?
Answer» What is thermit?

Discussion

23.	An object 2 cm tall is placed on the axis of a convex lens of focal length 5 cm at a distance of 10 cm from the optical centre of the lens. Find the nature, position and size of the image formed. Which case of image formation by convex lenses is illustrated by this example ?
Answer» An object 2 cm tall is placed on the axis of a convex lens of focal length 5 cm at a distance of 10 cm from the optical centre of the lens. Find the nature, position and size of the image formed. Which case of image formation by convex lenses is illustrated by this example ?

Discussion

24.	What is the value of acceleration due to gravity of the Earth?(Given mass of the Earth is 6×1024 kg and radius of the Earth is 6.4× 106 m).
Answer» What is the value of acceleration due to gravity of the Earth? (Given mass of the Earth is $6 \times 10^{24} k g$ and radius of the Earth is $6.4 \times$ $10^{6} m$ ).

Discussion

25.	Question 4A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly(a) 1020(b) 1016(c) 1018(d) 1023
Answer» Question 4 A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly (a) $10^{20}$ (b) $10^{16}$ (c) $10^{18}$ (d) $10^{23}$

Discussion

26.	What will be the possible graph of drift current and diffusion current as soon as p - n diode is formed? Current from n to p is taken positive. i1 is diffusion current and i2 is drift current.
Answer» What will be the possible graph of drift current and diffusion current as soon as p - n diode is formed? Current from n to p is taken positive. $i_{1}$ is diffusion current and $i_{2}$ is drift current.

Discussion

27.	The truth table depicting the logic gate realized from the given arrangements of p−n junction and resistor as shown in figure will be :
Answer» The truth table depicting the logic gate realized from the given arrangements of $p - n$ junction and resistor as shown in figure will be :

Discussion

28.	how to derive equations of motion
Answer» how to derive equations of motion

Discussion

29.	Rank the magnitudes of ∮→B.→dl for the closed paths a, b, c and d as shown in the figure. A long wire is located at the centre, perpendicular to the plane of the closed paths and carrying a current 1 A in outward direction.
Answer» Rank the magnitudes of $\oint \to B . \to d l$ for the closed paths $a, b, c$ and $d$ as shown in the figure. A long wire is located at the centre, perpendicular to the plane of the closed paths and carrying a current $1 A$ in outward direction.

Discussion

30.	A circular coil is held in a magnetic field, which is directed normally outwards, from the plane of the paper. The initial situation is shown in the figure. How many times the induced current becomes zero, in one complete rotation of the coil.
Answer» A circular coil is held in a magnetic field, which is directed normally outwards, from the plane of the paper. The initial situation is shown in the figure. How many times the induced current becomes zero, in one complete rotation of the coil.

Discussion

31.	What is friction force
Answer» What is friction force

Discussion

32.	Calculate the work done in raising a stone of 5kgand specific gravity 3 lying at the bed of a lake through the height of 5m .
Answer» Calculate the work done in raising a stone of 5kgand specific gravity 3 lying at the bed of a lake through the height of 5m .

Discussion

33.	An astronomical telescope has an objective of focal length 200 cm and an eye-piece of focal length 10 cm. An observer adjusts the distance of the eye piece from the objective to obtain the image of the sunon a screen 40 cm behind the eye-piece. The diameterof the sun's image is 60 cm. Find the diameter of thesun. The average earth sun distance is 1.5 x 10 m.
Answer» An astronomical telescope has an objective of focal length 200 cm and an eye-piece of focal length 10 cm. An observer adjusts the distance of the eye piece from the objective to obtain the image of the sun on a screen 40 cm behind the eye-piece. The diameter of the sun's image is 60 cm. Find the diameter of the sun. The average earth sun distance is 1.5 x 10 m.

Discussion

34.	An experiment is performed to verify Ohm's law. Observations are tabulated as follows: Current (I) in amperes0.10.20.30.40.5Potential difference (V) in volts1.22.43.64.86.0 (a) From the data, plot a V-I graph. (b) Show that the graph confirms the Ohm's law. (c) Find the resistance of the resistor used. [5 MARKS]
Answer» An experiment is performed to verify Ohm's law. Observations are tabulated as follows: $\begin{matrix} C u r r e n t (I) i n a m p e r e s & 0.1 & 0.2 & 0.3 & 0.4 & 0.5 P o t e n t i a l d i f f e r e n c e (V) i n v o l t s & 1.2 & 2.4 & 3.6 & 4.8 & 6.0 \end{matrix}$ (a) From the data, plot a V-I graph. (b) Show that the graph confirms the Ohm's law. (c) Find the resistance of the resistor used. [5 MARKS]

Discussion

35.	A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with a distance d between them. If a parallel beam of light falling on A leaves B as a parallel beam, then the distance d in cm will be
Answer» A convex lens $A$ of focal length $20 cm$ and a concave lens $B$ of focal length $5 cm$ are kept along the same axis with a distance $d$ between them. If a parallel beam of light falling on $A$ leaves $B$ as a parallel beam, then the distance $d$ in $cm$ will be

Discussion

36.	A barometer reads 75cm if mercury. When 2.0cm3 of air at atmospheric pressure is introduced into space above the mercury level, the volume of this space cecones 50cm3. find the length by which the mercury column desecds.
Answer» A barometer reads 75cm if mercury. When 2.0cm3 of air at atmospheric pressure is introduced into space above the mercury level, the volume of this space cecones 50cm3. find the length by which the mercury column desecds.

Discussion

37.	What is a galvanic celll and it's properties
Answer» What is a galvanic celll and it's properties

Discussion

38.	Find the angle of refraction in the following figure?
Answer» Find the angle of refraction in the following figure?

38.

Find the angle of refraction in the following figure?

Answer»

Find the angle of refraction in the following figure?

Discussion

39.	While performing the experiment on the determination of focal length of a convex lens, four student obtained the image of the same distant tree on the screen:Which diagram shows the formation of image correctly?(1) A(2) B(3) C(4) D
Answer» While performing the experiment on the determination of focal length of a convex lens, four student obtained the image of the same distant tree on the screen: Which diagram shows the formation of image correctly? (1) A (2) B (3) C (4) D

Discussion

40.	A dip circle is placed perpendicular to the magnetic meridian ,then the magnetic needle will align 1)hoeizontal 2)vertical 3) in direction of magnetic field 4) perpendicular to magnetic fueld
Answer» A dip circle is placed perpendicular to the magnetic meridian ,then the magnetic needle will align 1)hoeizontal 2)vertical 3) in direction of magnetic field 4) perpendicular to magnetic fueld

Discussion

41.	In a certain medical shop, the shopkeeper uses a strategy of using the pages of old newspapers to make envelopes for medicine. Which among the 3 R's strategies was implemented by him?
Answer» In a certain medical shop, the shopkeeper uses a strategy of using the pages of old newspapers to make envelopes for medicine. Which among the 3 R's strategies was implemented by him?

Discussion

42.	Which of the following devices are used to get three-dimensional visuals of internal organs?
Answer» Which of the following devices are used to get three-dimensional visuals of internal organs?

Discussion

43.	Two bulbs are marked 100 W, 220 V and 60 W, 110 V. The ratio of their resistances is
Answer» Two bulbs are marked 100 W, 220 V and 60 W, 110 V. The ratio of their resistances is

Discussion

44.	(a) Explain with the help of a diagram, why the concave lens is also called a diverging lens. (b) Define the principal focus of a concave lens.
Answer» (a) Explain with the help of a diagram, why the concave lens is also called a diverging lens. (b) Define the principal focus of a concave lens.

Discussion

45.	Do the enantiomer pair have same R-S configuration ?
Answer» Do the enantiomer pair have same R-S configuration ?

Discussion

46.	Question 1Why does a compass needle gets deflected when brought near a bar magnet?
Answer» Question 1 Why does a compass needle gets deflected when brought near a bar magnet?

Discussion

47.	63.What is the equivalent resistance across A and B .if all the resistance between any adjacent point is R
Answer» 63.What is the equivalent resistance across A and B .if all the resistance between any adjacent point is R

Discussion

48.	How did the campaign to save environment lead to the empowerment of women?
Answer» How did the campaign to save environment lead to the empowerment of women?

Discussion

49.	Sound wave having a frequency greater than 20000 Hz is said to be
Answer» Sound wave having a frequency greater than 20000 Hz is said to be

Discussion

50.	The graph shown in the figure represents change in the temperature of 5 kg of a substance with time, as it absorbs heat at a constant rate of 42 kJ min−1. The latent heat of vapourization of the substance is:
Answer» The graph shown in the figure represents change in the temperature of $5 k g$ of a substance with time, as it absorbs heat at a constant rate of $42 k J$ $m i n^{- 1}$ . The latent heat of vapourization of the substance is:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

If the value of resistance is 10.845 Ω and the value of current is 3.23 A. The value of potential difference with significant numbers is

The current density in a conducting medium is given by →J=40ρ2+1^az mA/m2.The net current crossing the circular disc (0&lt;ρ&lt;5m) in z = 2 plane is _____mA.(Answer upto 2 decimal places)409.42

A piece of wire is cut into four equal parts and the pieces are bundled together side by side to form a thickerwire. Compared with that of the original wire, the resistance of the bundle is

A telescope has an objective lens of focal length 200 cm and an eyepiece with focal length 2 cm. If this telescope is used to see a 50 m tall building at a distance of 2 km, what is the height of the image of the building formed by the objective lens ?

Name the wave which is used for taking photographs in the dark.

In a rocket, fuel burns at the rate of 2 kg/s. This fuel gets ejected from the rocket with a velocity of 80 km/s. Force exerted on the rocket is?

A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is propotional to: _________

In the line 'And as he slowly drew up, snake-easing his shoulders, and entered farther' the phrase snake easing' his shoulders means (a) loosening its shoulders (b) slipping in with majestic grace (c) moving slowly (d) moving fast

Is compression in longitudinal wave is antinode?

A particular type of high energy invisible electromagnetic rays help us to study the structure of crystals. The radiation is

A magnifying glass forms : (a) a real and diminished image (b) a real and magnified image (c) a virtual and magnified image (d) a virtual and diminished image.

One surface of a biconvex lens having focal length 40 cm is silvered. The radius of the curvature of the other surface is 60 cm. At what distance the silvered lens should an object be placed to obtain a real image magnified three times ?(Refractive index of lens, μL=1.5)

If the refractive indices of alcohol and benzene with respect to air are 1.36 and 1.50 respectively,then the refractive index of benzene with respect to alcohol is

Meaning of shrill

The heats of combustion of rhombic and monoclinic sulphur are respectively 70960 and 71030 calories. What will be the heat of conversion of rhombic sulphur to monoclinic ? (a) 70960 calories (b) 71030 calories (c) -70 calories (d) +70 calories.

When sound waves travel from a rarer gaseous medium to a denser gaseous medium, its speed __.

Number of electrons in a charge of 16 C will be

A gas at 0∘ is heated. Both its pressure and volume increases twice the initial value. Find the final temperature of the gas.

What is the principal of electrolytic refinig

What is thermit?

An object 2 cm tall is placed on the axis of a convex lens of focal length 5 cm at a distance of 10 cm from the optical centre of the lens. Find the nature, position and size of the image formed. Which case of image formation by convex lenses is illustrated by this example ?

What is the value of acceleration due to gravity of the Earth?(Given mass of the Earth is 6×1024 kg and radius of the Earth is 6.4× 106 m).

Question 4A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly(a) 1020(b) 1016(c) 1018(d) 1023​​​​​​​

What will be the possible graph of drift current and diffusion current as soon as p - n diode is formed? Current from n to p is taken positive. i1 is diffusion current and i2 is drift current.

The truth table depicting the logic gate realized from the given arrangements of p−n junction and resistor as shown in figure will be :

how to derive equations of motion

Rank the magnitudes of ∮→B.→dl for the closed paths a, b, c and d as shown in the figure. A long wire is located at the centre, perpendicular to the plane of the closed paths and carrying a current 1 A in outward direction.

A circular coil is held in a magnetic field, which is directed normally outwards, from the plane of the paper. The initial situation is shown in the figure. How many times the induced current becomes zero, in one complete rotation of the coil.

What is friction force

Calculate the work done in raising a stone of 5kgand specific gravity 3 lying at the bed of a lake through the height of 5m .

A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with a distance d between them. If a parallel beam of light falling on A leaves B as a parallel beam, then the distance d in cm will be

A barometer reads 75cm if mercury. When 2.0cm3 of air at atmospheric pressure is introduced into space above the mercury level, the volume of this space cecones 50cm3. find the length by which the mercury column desecds.

What is a galvanic celll and it's properties

Find the angle of refraction in the following figure?

While performing the experiment on the determination of focal length of a convex lens, four student obtained the image of the same distant tree on the screen:Which diagram shows the formation of image correctly?(1) A(2) B(3) C(4) D

A dip circle is placed perpendicular to the magnetic meridian ,then the magnetic needle will align 1)hoeizontal 2)vertical 3) in direction of magnetic field 4) perpendicular to magnetic fueld

In a certain medical shop, the shopkeeper uses a strategy of using the pages of old newspapers to make envelopes for medicine. Which among the 3 R's strategies was implemented by him?

Which of the following devices are used to get three-dimensional visuals of internal organs?

Two bulbs are marked 100 W, 220 V and 60 W, 110 V. The ratio of their resistances is

(a) Explain with the help of a diagram, why the concave lens is also called a diverging lens. (b) Define the principal focus of a concave lens.

Do the enantiomer pair have same R-S configuration ?

Question 1Why does a compass needle gets deflected when brought near a bar magnet?

63.What is the equivalent resistance across A and B .if all the resistance between any adjacent point is R

How did the campaign to save environment lead to the empowerment of women?

Sound wave having a frequency greater than 20000 Hz is said to be

The graph shown in the figure represents change in the temperature of 5 kg of a substance with time, as it absorbs heat at a constant rate of 42 kJ min−1. The latent heat of vapourization of the substance is:

The current density in a conducting medium is given by →J=40ρ2+1^az mA/m2.The net current crossing the circular disc (0<ρ<5m) in z = 2 plane is _____mA.(Answer upto 2 decimal places)409.42

Question 4A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly(a) 1020(b) 1016(c) 1018(d) 1023