16569 + Interview Questions in Physics

1.	What is the magnetic torque of CCl4
Answer» What is the magnetic torque of CCl4

Discussion

2.	For a normal adult, distance of near point of vision is about:
Answer» For a normal adult, distance of near point of vision is about:

Discussion

3.	. A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes. In order toincrease the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the personhas to use, will beA. Concave, -0.25 DiopterB. Convex, -7. 8 DiopterAnd why image distance(v) is taken as -400 and not -50 but he can see clear object between these two ranges.
Answer» . A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be A. Concave, -0.25 Diopter B. Convex, -7. 8 Diopter And why image distance(v) is taken as -400 and not -50 but he can see clear object between these two ranges.

Discussion

4.	28.A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is T. Assume that Newton's law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be :
Answer» 28.A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is T. Assume that Newton's law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be :

Discussion

5.	The resistance of the rheostat shown in figure is 30 Ω. Neglecting the ammeter resistance, the ratio of minimum and maximum currents through the ammeter, as the rheostat is varied, will be
Answer» The resistance of the rheostat shown in figure is $30 Ω$ . Neglecting the ammeter resistance, the ratio of minimum and maximum currents through the ammeter, as the rheostat is varied, will be

Discussion

6.	Select the correct relation(s) for pressure.
Answer» Select the correct relation(s) for pressure.

Discussion

7.	A plane mirror is placed at the bottom of a tank containing a liquid of refractive index μ. P is a small object at a height h above the mirror. An observer O vertically above P above the liquid level sees P and its image in the mirror. The apparent distance between these two will be:
Answer» A plane mirror is placed at the bottom of a tank containing a liquid of refractive index $μ$ . P is a small object at a height h above the mirror. An observer O vertically above P above the liquid level sees P and its image in the mirror. The apparent distance between these two will be:

Discussion

8.	what is gravational force and strong nuclear force?
Answer» what is gravational force and strong nuclear force?

Discussion

9.	A small, circular loop of wire is placed inside a long solenoid carrying a current. The plane of the loop contains the axis of the solenoid. If the current in the solenoid is varied, the current induced in the loop is Options: AnticlockwiseClockwiseZeroClockwise or anticlockwise depending on whether the resistance is increased or decreased
Answer» A small, circular loop of wire is placed inside a long solenoid carrying a current. The plane of the loop contains the axis of the solenoid. If the current in the solenoid is varied, the current induced in the loop is Options: Anticlockwise Clockwise Zero Clockwise or anticlockwise depending on whether the resistance is increased or decreased

Discussion

10.	ntthe resistance between any two junctions of a star network is R=10 ohm. resistance between two adjacentcorners of the star is?n
Answer» ntthe resistance between any two junctions of a star network is R=10 ohm. resistance between two adjacentcorners of the star is?n

Discussion

11.	It is impossible to identify colours, without which light sensitive organ of human body?
Answer» It is impossible to identify colours, without which light sensitive organ of human body?

Discussion

12.	a ray of light suffers minimum deviation of 60 degree through an equilateral prism .the speed of light in glass prism
Answer» a ray of light suffers minimum deviation of 60 degree through an equilateral prism .the speed of light in glass prism

Discussion

13.	Question 3A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
Answer» Question 3 A lamp consumes 1000 J of electrical energy in 10 s. What is its power?

Discussion

14.	Expression of magnetic field using Biot- Savart law for a charge q moving with velocity v as shown in the figure is,
Answer» Expression of magnetic field using Biot- Savart law for a charge $q$ moving with velocity $v$ as shown in the figure is,

Discussion

15.	Proove Refractive index=real depthapparent depth.
Answer» Proove $Refractive index=real depthapparent depth$ .

Discussion

16.	An object is placed in front of two convex lenses one by one at a dis†an ce u from the lens. The focal lengths of the lenses are 30cm and 15cm respectively. If the size of image formed in the two cases is same, then u is 1)15 c 2)20 cm 3)25 cm
Answer» An object is placed in front of two convex lenses one by one at a dis†an ce u from the lens. The focal lengths of the lenses are 30cm and 15cm respectively. If the size of image formed in the two cases is same, then u is 1)15 c 2)20 cm 3)25 cm

Discussion

17.	The critical angle for diamond ( refractive index=2.4 ) is
Answer» The critical angle for diamond $( refractive index=2.4 )$ is

17.

The critical angle for diamond ( refractive index=2.4 ) is

Answer»

The critical angle for diamond $( refractive index=2.4 )$ is

Discussion

18.	Question 13Can we use the same fuse in a geyser and a television set? Explain.
Answer» Question 13 Can we use the same fuse in a geyser and a television set? Explain.

18.

Question 13Can we use the same fuse in a geyser and a television set? Explain.

Answer»

Question 13

Can we use the same fuse in a geyser and a television set? Explain.

Discussion

19.	The radius of curvature of the convex face of a plano-convex lens is 12 cm and its refractive index is 1.5. Theplane surface of the lens is now silvered At what distance from the lens will parailel rays incident on the convexface converge?(B) 12 cm(A)6 cm(C)24 cm(D)48 cm
Answer» The radius of curvature of the convex face of a plano-convex lens is 12 cm and its refractive index is 1.5. Theplane surface of the lens is now silvered At what distance from the lens will parailel rays incident on the convexface converge?(B) 12 cm(A)6 cm(C)24 cm(D)48 cm

Discussion

20.	A fish looking up through the water sees the outside world containing in a circular horizon. If the fish is 28 cm below the water surface, the radius of that circle is (R.I of water=43)
Answer» A fish looking up through the water sees the outside world containing in a circular horizon. If the fish is 28 cm below the water surface, the radius of that circle is $(R . I o f w a t e r = \frac{4}{3})$

Discussion

21.	Answer in just 1-4sentences.how do you conclude that a ray of light incident towards the optical centre of a thin lens is transmitted without any deviation
Answer» Answer in just 1-4sentences.how do you conclude that a ray of light incident towards the optical centre of a thin lens is transmitted without any deviation

Discussion

22.	Show that in the free oscillations of an LC circuits, the sum of energies stored in the capacitor and the inductor is constant in time
Answer» Show that in the free oscillations of an LC circuits, the sum of energies stored in the capacitor and the inductor is constant in time

Discussion

23.	Why is acceleration due to gravity of earth independent of mass?
Answer» Why is acceleration due to gravity of earth independent of mass?

Discussion

24.	When an object is at distance x and y from a lens, a real image and a virtual image is formed respectively having some magnification. The focal length of the lens is (a) (x+y)/2 (b) x – y(c) √xy (d) x + y
Answer» When an object is at distance x and y from a lens, a real image and a virtual image is formed respectively having some magnification. The focal length of the lens is (a) (x+y)/2 (b) x – y (c) √xy (d) x + y

Discussion

25.	If the radius of a star is R and it acts as a blackbody, what would be the temperature of the star, inwhich the rate of energy production is Q?
Answer» If the radius of a star is R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q?

Discussion

26.	A radioactive nucleus undergoes a series of decay according to the scheme Aα→A1 β−→A2 α→A3 γ→A4.If the mass number and atomic number of A are 180 and 72 respectively. The mass numbers of A4 is (integer only)
Answer» A radioactive nucleus undergoes a series of decay according to the scheme $A α \to A_{1}^{-} A_{2} α \to A_{3} γ \to A_{4}$ . If the mass number and atomic number of $A$ are $180$ and $72$ respectively. The mass numbers of $A_{4}$ is (integer only)

Discussion

27.	what is ins†an†an aeus velocity?
Answer» what is ins†an†an aeus velocity?

Discussion

28.	would balancing length increase or decrease if the resis†an ce cobbected in parralel to the s†an dard emf to be measeured was increased
Answer» would balancing length increase or decrease if the resis†an ce cobbected in parralel to the s†an dard emf to be measeured was increased

Discussion

29.	The isotopes of an element X are zXA, zXA+1, zXA+2 respectively. What is the ratio of number of nucleons in these respective isotopes?
Answer» The isotopes of an element X are $_{z} X^{A},_{z} X^{A + 1},_{z} X^{A + 2}$ respectively. What is the ratio of number of nucleons in these respective isotopes?

Discussion

30.	A convex lens of focal length f produces a virtual image n times the size of the object. Then the distance of the object from the lens is:
Answer» A convex lens of focal length $f$ produces a virtual image $n$ times the size of the object. Then the distance of the object from the lens is:

Discussion

31.	Are the equations of motion applicable for the analysis of motion under gravity near the surface of the Earth? Why?
Answer» Are the equations of motion applicable for the analysis of motion under gravity near the surface of the Earth? Why?

Discussion

32.	An inductor does not allow sudden changes in:
Answer» An inductor does not allow sudden changes in:

Discussion

33.	A 1.25 kW heater works on a 220 V mains supply. What current rating would a suitable fuse have ? (a) 2 A (b) 5 A (c) 10 A (d) 13 A
Answer» A 1.25 kW heater works on a 220 V mains supply. What current rating would a suitable fuse have ? (a) 2 A (b) 5 A (c) 10 A (d) 13 A

33.

A 1.25 kW heater works on a 220 V mains supply. What current rating would a suitable fuse have ? (a) 2 A (b) 5 A (c) 10 A (d) 13 A

Answer»

A 1.25 kW heater works on a 220 V mains supply. What current rating would a suitable fuse have ?

(a) 2 A (b) 5 A (c) 10 A (d) 13 A

Discussion

34.	Two plane mirrors are inclined at 70 degree. A ray incident on one mirror at incident angle theta,after reflection falls on the 2nd mirror and is reflected from there parallel to the first mirror. The value of theta is
Answer» Two plane mirrors are inclined at 70 degree. A ray incident on one mirror at incident angle theta,after reflection falls on the 2nd mirror and is reflected from there parallel to the first mirror. The value of theta is

Discussion

35.	The number of turns per unit length of a long solenoid is 10. If the average radius is 5cm and it carries a current of 10A, then the ratio of flux densities obtained at the centre and at the end on the axis will be
Answer» The number of turns per unit length of a long solenoid is 10. If the average radius is 5cm and it carries a current of 10A, then the ratio of flux densities obtained at the centre and at the end on the axis will be

Discussion

36.	Is 2.5 Coulomb a reality or myth
Answer» Is 2.5 Coulomb a reality or myth

Discussion

37.	A man eats glucose and then he moves a block, which then comes to rest after sliding on a rough floor. The correct order of energy changes can be:
Answer» A man eats glucose and then he moves a block, which then comes to rest after sliding on a rough floor. The correct order of energy changes can be:

Discussion

38.	Two plane mirrors are initially inclined at 30° and they are moved apart by 30° each time, till the angle between them becomes 120°. If an object is placed symmetrically between them then find the sum of all the images formed.
Answer» Two plane mirrors are initially inclined at 30° and they are moved apart by 30° each time, till the angle between them becomes 120°. If an object is placed symmetrically between them then find the sum of all the images formed.

Discussion

39.	Due to an impulse, the change in momentum of a body is 1.8 kg ms−1. How much is the force acted on it if the duration of the force acting is 0.2 s ?
Answer» Due to an impulse, the change in momentum of a body is $1.8 k g m s^{- 1}$ . How much is the force acted on it if the duration of the force acting is $0.2 s$ ?

Discussion

40.	a current is flowing in a circuit a resistance is reached in parallel in this the current divide is its potential same in both way of resistance if yes then why
Answer» a current is flowing in a circuit a resistance is reached in parallel in this the current divide is its potential same in both way of resistance if yes then why

Discussion

41.	Potassium surface with a work function of 2.30 eV is irradiated with a radiation of frequency 9.5×1014 Hz. Negative potential to be applied to the anode to ensure no electrons reach the anode plate, is,
Answer» Potassium surface with a work function of $2.30 eV$ is irradiated with a radiation of frequency $9.5 \times 10^{14} Hz$ . Negative potential to be applied to the anode to ensure no electrons reach the anode plate, is,

Discussion

42.	How can we say that refractive index of red is less than violet
Answer» How can we say that refractive index of red is less than violet

Discussion

43.	When a material is inserted Into the solenoid,the magnetic field becomes B=meu H how n why?
Answer» When a material is inserted Into the solenoid,the magnetic field becomes B=meu H how n why?

Discussion

44.	How to apply gauss theorem in infinitely long linear charge distribution
Answer» How to apply gauss theorem in infinitely long linear charge distribution

Discussion

45.	A body of mass m is placed on a rough disk of radius R which is rotating about its own axis. It's initial angular speed zero and angular acceleration is alfa. Find out the maximum angular speed show that the body will be at rest with respect to disk.
Answer» A body of mass m is placed on a rough disk of radius R which is rotating about its own axis. It's initial angular speed zero and angular acceleration is alfa. Find out the maximum angular speed show that the body will be at rest with respect to disk.

Discussion

46.	What are the limitations of extracting energy from wind?
Answer» What are the limitations of extracting energy from wind?

Discussion

47.	A 100 W immersion heater is placed in a pot containing 1 litre of water at 20∘C. How long will it take to heat water to boiling temperature. if 20% of the available energy is lost to surroundings ?
Answer» A $100 W$ immersion heater is placed in a pot containing $1 litre$ of water at $20^{\circ} C$ . How long will it take to heat water to boiling temperature. if $20 %$ of the available energy is lost to surroundings ?

Discussion

48.	ntif wire is streatched soits length increases20%more than initial length % incresesinresistence of wire willbe,terminalP.Dof a cell always les than its emfn
Answer» ntif wire is streatched soits length increases20%more than initial length % incresesinresistence of wire willbe,terminalP.Dof a cell always les than its emfn

Discussion

49.	Q1. Consider the following statements about GOBAR-DHAN Scheme: 1. The Ministry of Drinking Water & Sanitation has launched GOBAR (Galvanizing Organic Bio-Agro Resources) – DHAN scheme at National Dairy Research Institute (NDRI) Karnal. 2. It was launched under Swachh Bharat Mission (Gramin). Which of the above statements are correct?
Answer» Q1. Consider the following statements about GOBAR-DHAN Scheme: 1. The Ministry of Drinking Water & Sanitation has launched GOBAR (Galvanizing Organic Bio-Agro Resources) – DHAN scheme at National Dairy Research Institute (NDRI) Karnal. 2. It was launched under Swachh Bharat Mission (Gramin). Which of the above statements are correct?

49.

Q1. Consider the following statements about GOBAR-DHAN Scheme: 1. The Ministry of Drinking Water & Sanitation has launched GOBAR (Galvanizing Organic Bio-Agro Resources) – DHAN scheme at National Dairy Research Institute (NDRI) Karnal. 2. It was launched under Swachh Bharat Mission (Gramin). Which of the above statements are correct?

Answer»

Q1. Consider the following statements about GOBAR-DHAN Scheme:

1. The Ministry of Drinking Water & Sanitation has launched GOBAR (Galvanizing Organic Bio-Agro Resources) – DHAN scheme at National Dairy Research Institute (NDRI) Karnal.

2. It was launched under Swachh Bharat Mission (Gramin).

Which of the above statements are correct?

Discussion

50.	A student obtained a sharp image of the grill of a window in the laboratory on a screen, using a convex lens. For getting better results, her teacher suggested focussing of a distant tree instead of the grill. In which direction should the lens be moved for this purpose to get a sharp image on the screen?(1) Towards the screen(2) Away from the screen(3) Behind the screen(4) Very far away from the screen
Answer» A student obtained a sharp image of the grill of a window in the laboratory on a screen, using a convex lens. For getting better results, her teacher suggested focussing of a distant tree instead of the grill. In which direction should the lens be moved for this purpose to get a sharp image on the screen? (1) Towards the screen (2) Away from the screen (3) Behind the screen (4) Very far away from the screen

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What is the magnetic torque of CCl4

For a normal adult, distance of near point of vision is about:

28.A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is T. Assume that Newton's law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be :

The resistance of the rheostat shown in figure is 30 Ω. Neglecting the ammeter resistance, the ratio of minimum and maximum currents through the ammeter, as the rheostat is varied, will be

Select the correct relation(s) for pressure.

A plane mirror is placed at the bottom of a tank containing a liquid of refractive index μ. P is a small object at a height h above the mirror. An observer O vertically above P above the liquid level sees P and its image in the mirror. The apparent distance between these two will be:

what is gravational force and strong nuclear force?

ntthe resistance between any two junctions of a star network is R=10 ohm. resistance between two adjacentcorners of the star is?n

It is impossible to identify colours, without which light sensitive organ of human body?

a ray of light suffers minimum deviation of 60 degree through an equilateral prism .the speed of light in glass prism

Question 3A lamp consumes 1000 J of electrical energy in 10 s. What is its power?

Expression of magnetic field using Biot- Savart law for a charge q moving with velocity v as shown in the figure is,

Proove Refractive index=real depthapparent depth.

An object is placed in front of two convex lenses one by one at a dis†an ce u from the lens. The focal lengths of the lenses are 30cm and 15cm respectively. If the size of image formed in the two cases is same, then u is 1)15 c 2)20 cm 3)25 cm

The critical angle for diamond ( refractive index=2.4 ) is

Question 13Can we use the same fuse in a geyser and a television set? Explain.

The radius of curvature of the convex face of a plano-convex lens is 12 cm and its refractive index is 1.5. Theplane surface of the lens is now silvered At what distance from the lens will parailel rays incident on the convexface converge?(B) 12 cm(A)6 cm(C)24 cm(D)48 cm

A fish looking up through the water sees the outside world containing in a circular horizon. If the fish is 28 cm below the water surface, the radius of that circle is (R.I of water=43)

Answer in just 1-4sentences.how do you conclude that a ray of light incident towards the optical centre of a thin lens is transmitted without any deviation

Show that in the free oscillations of an LC circuits, the sum of energies stored in the capacitor and the inductor is constant in time

Why is acceleration due to gravity of earth independent of mass?

When an object is at distance x and y from a lens, a real image and a virtual image is formed respectively having some magnification. The focal length of the lens is (a) (x+y)/2 (b) x – y(c) √xy (d) x + y

If the radius of a star is R and it acts as a blackbody, what would be the temperature of the star, inwhich the rate of energy production is Q?

A radioactive nucleus undergoes a series of decay according to the scheme Aα→A1 β−→A2 α→A3 γ→A4.If the mass number and atomic number of A are 180 and 72 respectively. The mass numbers of A4 is (integer only)

what is ins†an†an aeus velocity?

would balancing length increase or decrease if the resis†an ce cobbected in parralel to the s†an dard emf to be measeured was increased

The isotopes of an element X are zXA, zXA+1, zXA+2 respectively. What is the ratio of number of nucleons in these respective isotopes?

A convex lens of focal length f produces a virtual image n times the size of the object. Then the distance of the object from the lens is:

Are the equations of motion applicable for the analysis of motion under gravity near the surface of the Earth? Why?

An inductor does not allow sudden changes in:

A 1.25 kW heater works on a 220 V mains supply. What current rating would a suitable fuse have ? (a) 2 A (b) 5 A (c) 10 A (d) 13 A

Two plane mirrors are inclined at 70 degree. A ray incident on one mirror at incident angle theta,after reflection falls on the 2nd mirror and is reflected from there parallel to the first mirror. The value of theta is

The number of turns per unit length of a long solenoid is 10. If the average radius is 5cm and it carries a current of 10A, then the ratio of flux densities obtained at the centre and at the end on the axis will be

Is 2.5 Coulomb a reality or myth

A man eats glucose and then he moves a block, which then comes to rest after sliding on a rough floor. The correct order of energy changes can be:

Two plane mirrors are initially inclined at 30° and they are moved apart by 30° each time, till the angle between them becomes 120°. If an object is placed symmetrically between them then find the sum of all the images formed.

Due to an impulse, the change in momentum of a body is 1.8 kg ms−1. How much is the force acted on it if the duration of the force acting is 0.2 s ?

a current is flowing in a circuit a resistance is reached in parallel in this the current divide is its potential same in both way of resistance if yes then why

Potassium surface with a work function of 2.30 eV is irradiated with a radiation of frequency 9.5×1014 Hz. Negative potential to be applied to the anode to ensure no electrons reach the anode plate, is,

How can we say that refractive index of red is less than violet

When a material is inserted Into the solenoid,the magnetic field becomes B=meu H how n why?

How to apply gauss theorem in infinitely long linear charge distribution

A body of mass m is placed on a rough disk of radius R which is rotating about its own axis. It's initial angular speed zero and angular acceleration is alfa. Find out the maximum angular speed show that the body will be at rest with respect to disk.

What are the limitations of extracting energy from wind?

A 100 W immersion heater is placed in a pot containing 1 litre of water at 20∘C. How long will it take to heat water to boiling temperature. if 20% of the available energy is lost to surroundings ?

ntif wire is streatched soits length increases20%more than initial length % incresesinresistence of wire willbe,terminalP.Dof a cell always les than its emfn