16569 + Interview Questions in Physics

1.	200 g of hot water at 80∘C is added to 300 g of cold water at 10∘C.Neglecting the heat taken by the container,calculate the final temperature of the mixture of water.Specific heat capacity of water =4200 J kg−1 K−1 .
Answer» 200 g of hot water at $80^{\circ} C$ is added to 300 g of cold water at $10^{\circ} C$ .Neglecting the heat taken by the container,calculate the final temperature of the mixture of water.Specific heat capacity of water =4200 J k $g^{- 1} K^{- 1}$ .

Discussion

2.	Which one of the following is a characteristic of cropland ecosystem?
Answer» Which one of the following is a characteristic of cropland ecosystem?

Discussion

3.	A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R′, then the ratio RR′ is
Answer» A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is $R^{^{'}}$ , then the ratio $\frac{R}{R^{^{'}}}$ is

Discussion

4.	Vm-1 is the unit of : A) potential B) electric field intensity C) electric current D) electric potential energy
Answer» Vm^-1 is the unit of : A) potential B) electric field intensity C) electric current D) electric potential energy

4.

Vm-1 is the unit of : A) potential B) electric field intensity C) electric current D) electric potential energy

Answer»

Vm^-1 is the unit of :

A) potential

B) electric field intensity

C) electric current

D) electric potential energy

Discussion

5.	Choose the correct statement based on the penetrating power.
Answer» Choose the correct statement based on the penetrating power.

Discussion

6.	Compare the power used in 2 ohm resistor in each of the following circuits a)6 volt battery in series with 1 ohm and 2 ohm resistors And b)4 volt battery in parallel with 12 ohm and 2 ohm resistors
Answer» Compare the power used in 2 ohm resistor in each of the following circuits a)6 volt battery in series with 1 ohm and 2 ohm resistors And b)4 volt battery in parallel with 12 ohm and 2 ohm resistors

6.

Compare the power used in 2 ohm resistor in each of the following circuits a)6 volt battery in series with 1 ohm and 2 ohm resistors And b)4 volt battery in parallel with 12 ohm and 2 ohm resistors

Answer»

Compare the power used in 2 ohm resistor in each of the following circuits

a)6 volt battery in series with 1 ohm and 2 ohm resistors

And

b)4 volt battery in parallel with 12 ohm and 2 ohm resistors

Discussion

7.	A lens of focal length 20 cm is used to produce a ten times magnified image of a film slide on a screen. How far must the slide be placed from the lens?
Answer» A lens of focal length 20 cm is used to produce a ten times magnified image of a film slide on a screen. How far must the slide be placed from the lens?

Discussion

8.	How a cell or a battery produces potential difference when connected to a circuit? Or What happens inside a cell due to which current flow?
Answer» How a cell or a battery produces potential difference when connected to a circuit? Or What happens inside a cell due to which current flow?

8.

How a cell or a battery produces potential difference when connected to a circuit? Or What happens inside a cell due to which current flow?

Answer»

How a cell or a battery produces potential difference when connected to a circuit?

Or

What happens inside a cell due to which current flow?

Discussion

9.	What is the difference between electric power, electrical energy, heat produced by a conductor on current being passed through it?
Answer» What is the difference between electric power, electrical energy, heat produced by a conductor on current being passed through it?

Discussion

10.	Why is tidal energy not likely to be the potential source of energy?
Answer» Why is tidal energy not likely to be the potential source of energy?

Discussion

11.	A doctor has prescribed a corrective lens of power+1.5 doctor. Find the focal length (a) is the prescribed lens diverging or converging
Answer» A doctor has prescribed a corrective lens of power+1.5 doctor. Find the focal length (a) is the prescribed lens diverging or converging

11.

A doctor has prescribed a corrective lens of power+1.5 doctor. Find the focal length (a) is the prescribed lens diverging or converging

Answer»

A doctor has prescribed a corrective lens of power+1.5 doctor. Find the focal length

(a) is the prescribed lens diverging or converging

Discussion

12.	A concave lens made of a material of refractive index n1 is kept in a medium of refractive index n2. A parallel beam of light is incident on the lens. Complete the path of rays of light emerging from the concave lens if: (a) n1>n2 and (b) n1<n2. [5 MARKS]
Answer» A concave lens made of a material of refractive index $n_{1}$ is kept in a medium of refractive index $n_{2}$ . A parallel beam of light is incident on the lens. Complete the path of rays of light emerging from the concave lens if: (a) $n_{1} > n_{2}$ and (b) $n_{1} < n_{2}$ . [5 MARKS]

Discussion

13.	A convex lens of power 5D is placed at a distance of 30 cm from a screen. At what distance from the lens should the screen be placed so that its image is formed on the screen?
Answer» A convex lens of power 5D is placed at a distance of 30 cm from a screen. At what distance from the lens should the screen be placed so that its image is formed on the screen?

Discussion

14.	Which phenomenon is responsible for making the path of light visible?
Answer» Which phenomenon is responsible for making the path of light visible?

Discussion

15.	An object 20 cm from a spherical mirror gives rise to a virtual image 15 cm behind the mirror. Determine the magnification of the image and the type of mirror used.
Answer» An object 20 cm from a spherical mirror gives rise to a virtual image 15 cm behind the mirror. Determine the magnification of the image and the type of mirror used.

Discussion

16.	A radioactive element 88X240 emits a few radiations to become 90Y220 . Calculate the number of alpha & beta particles emitted.
Answer» A radioactive element ₈₈X²⁴⁰ emits a few radiations to become ₉₀Y²²⁰. Calculate the number of alpha & beta particles emitted.

Discussion

17.	(a) Draw a neat and labelled diagram of the experimental set up for observing the scattering of light in a colloidal solution of sulphur to show how the sky appears blue, and the sun appears red at sunrise and sunset. (b) Out of blue light and red light, which one is scattered more easily ? (c) Which component of sunlight is scattered away when the sun appears red at sunrise or sunset ? (d) What causes the scattering of blue component of sunlight in the atmosphere ?
Answer» (a) Draw a neat and labelled diagram of the experimental set up for observing the scattering of light in a colloidal solution of sulphur to show how the sky appears blue, and the sun appears red at sunrise and sunset. (b) Out of blue light and red light, which one is scattered more easily ? (c) Which component of sunlight is scattered away when the sun appears red at sunrise or sunset ? (d) What causes the scattering of blue component of sunlight in the atmosphere ?

Discussion

18.	A person suffering from the eye-defect myopia (short-sightedness) can see clearly only up to a distance of 2 metres. What is the nature and power of lens required to rectify this defect ?
Answer» A person suffering from the eye-defect myopia (short-sightedness) can see clearly only up to a distance of 2 metres. What is the nature and power of lens required to rectify this defect ?

Discussion

19.	Which of the following statement is correct
Answer» Which of the following statement is correct

Discussion

20.	A ray of light incidents on a plane mirror at an angle of The deviation produced in the ray is
Answer» A ray of light incidents on a plane mirror at an angle of The deviation produced in the ray is

20.

A ray of light incidents on a plane mirror at an angle of The deviation produced in the ray is

Answer»

A ray of light incidents on a plane mirror at an angle of The deviation

produced in the ray is

Discussion

21.	A ray of light is incident on a denser medium at an angle 60∘. The angle of refraction is different for different mediums for the same angle of incidence i.e. 60∘. In which medium the speed of light is slowest?
Answer» A ray of light is incident on a denser medium at an angle $60^{\circ}$ . The angle of refraction is different for different mediums for the same angle of incidence i.e. $60^{\circ}$ . In which medium the speed of light is slowest?

21.

A ray of light is incident on a denser medium at an angle 60∘. The angle of refraction is different for different mediums for the same angle of incidence i.e. 60∘. In which medium the speed of light is slowest?

Answer»

A ray of light is incident on a denser medium at an angle $60^{\circ}$ . The angle of refraction is different for different mediums for the same angle of incidence i.e. $60^{\circ}$ . In which medium the speed of light is slowest?

Discussion

22.	The radius of curvature of the path of the charged particle in a uniform magnetic field is directly proportional to
Answer» The radius of curvature of the path of the charged particle in a uniform magnetic field is directly proportional to

Discussion

23.	An object is placed perpendicular to principal axis of a convex lens of focal length 20cm.the distance of object from lens is 30cm Find the position,magn magnifica and Nature of image
Answer» An object is placed perpendicular to principal axis of a convex lens of focal length 20cm.the distance of object from lens is 30cm Find the position,magn magnifica and Nature of image

23.

An object is placed perpendicular to principal axis of a convex lens of focal length 20cm.the distance of object from lens is 30cm Find the position,magn magnifica and Nature of image

Answer»

An object is placed perpendicular to principal axis of a convex lens of focal length 20cm.the distance of object from lens is 30cm

Find the position,magn magnifica and Nature of image

Discussion

24.	Name the force required for uniform circular motion.
Answer» Name the force required for uniform circular motion.

Discussion

25.	AC generator will have ___ rings.
Answer» AC generator will have ___ rings.

Discussion

26.	Statement 1 : Angle of incidence is always equal to the angle of reflection. Statement 2: Angle of incidence is always twice the angle of reflection. Statement 3: The incident ray reflected ray and the normal all lie in 3 different planes. Statement 4: The incidence ray reflected ray and the normal all lie in the same plane. Which of the statements refer to the laws of reflection?
Answer» Statement 1 : Angle of incidence is always equal to the angle of reflection. Statement 2: Angle of incidence is always twice the angle of reflection. Statement 3: The incident ray reflected ray and the normal all lie in 3 different planes. Statement 4: The incidence ray reflected ray and the normal all lie in the same plane. Which of the statements refer to the laws of reflection?

26.

Statement 1 : Angle of incidence is always equal to the angle of reflection. Statement 2: Angle of incidence is always twice the angle of reflection. Statement 3: The incident ray reflected ray and the normal all lie in 3 different planes. Statement 4: The incidence ray reflected ray and the normal all lie in the same plane. Which of the statements refer to the laws of reflection?

Answer»

Statement 1 : Angle of incidence is always equal to the angle of reflection.

Statement 2: Angle of incidence is always twice the angle of reflection.

Statement 3: The incident ray reflected ray and the normal all lie in 3 different planes.

Statement 4: The incidence ray reflected ray and the normal all lie in the same plane.

Which of the statements refer to the laws of reflection?

Discussion

27.	The circuit which is made up of various seperately manufactured components is known as:
Answer» The circuit which is made up of various seperately manufactured components is known as:

Discussion

28.	In the given figure, when light emerges from the glass slab, the light ray bends ___
Answer» In the given figure, when light emerges from the glass slab, the light ray bends ___

Discussion

29.	Explain the different parts of a screw gauge with a detailed diagram.
Answer» Explain the different parts of a screw gauge with a detailed diagram.

Discussion

30.	derive a relation between relative and absolute refractive index
Answer» derive a relation between relative and absolute refractive index

Discussion

31.	Will the rainbow form when the sunlight is red or during the sunset and sunrise
Answer» Will the rainbow form when the sunlight is red or during the sunset and sunrise

Discussion

32.	Soft iron core is used in dc motor and ac generator. Explain ?
Answer» Soft iron core is used in dc motor and ac generator. Explain ?

Discussion

33.	An electric kettle is rated 3 kW, 250 V. Give reason whether this kettle can be used in a circuit which contains a fuse of current rating 13 A.
Answer» An electric kettle is rated 3 kW, 250 V. Give reason whether this kettle can be used in a circuit which contains a fuse of current rating 13 A.

33.

An electric kettle is rated 3 kW, 250 V. Give reason whether this kettle can be used in a circuit which contains a fuse of current rating 13 A.

Answer»

An electric kettle is rated 3 kW, 250 V. Give reason whether this kettle can be used in a circuit which contains a fuse of current rating 13 A.

Discussion

34.	Sound cannot travel in
Answer» Sound cannot travel in

Discussion

35.	When voltmeter is attached in series then ammeter shows zero.why?
Answer» When voltmeter is attached in series then ammeter shows zero.why?

Discussion

36.	Name the defect of vision which can be corrected by a diverging lens. Show clearly by a ray diagram how the lens corrects the defect.
Answer» Name the defect of vision which can be corrected by a diverging lens. Show clearly by a ray diagram how the lens corrects the defect.

Discussion

37.	Light enters from air to glass plate having refractive index 1.5. The speed of light in glass is
Answer» Light enters from air to glass plate having refractive index 1.5. The speed of light in glass is

Discussion

38.	Calculate the kinetic energy of bob of a simple pendulum when it reaches the mean position after releasing from the extreme position as shown in the figure.
Answer» Calculate the kinetic energy of bob of a simple pendulum when it reaches the mean position after releasing from the extreme position as shown in the figure.

Discussion

39.	A body is vibrating in simple harmonic motion with an amplitude of 0.06 m and frequency of 15 Hz. The velocity and acceleration of body is
Answer» A body is vibrating in simple harmonic motion with an amplitude of 0.06 m and frequency of 15 Hz. The velocity and acceleration of body is

Discussion

40.	(a) State the position of object for which the image formed by a concave mirror is of same size. (b) Write two more characteristics of the image.
Answer» (a) State the position of object for which the image formed by a concave mirror is of same size. (b) Write two more characteristics of the image.

40.

(a) State the position of object for which the image formed by a concave mirror is of same size. (b) Write two more characteristics of the image.

Answer»

(a) State the position of object for which the image formed by a concave mirror is of same size.

(b) Write two more characteristics of the image.

Discussion

41.	Name the waves (a) of lowest wavelength, (b) used for taking photographs in dark, (c) produced by the changes in the nucleus of an atom, (d) of wavelength nearly 0.1 nm.
Answer» Name the waves (a) of lowest wavelength, (b) used for taking photographs in dark, (c) produced by the changes in the nucleus of an atom, (d) of wavelength nearly 0.1 nm.

Discussion

42.	How should the object be placed to get the laterally inverted image?
Answer» How should the object be placed to get the laterally inverted image?

Discussion

43.	What is the use and purpose of a resistor in a electrical circuit?
Answer» What is the use and purpose of a resistor in a electrical circuit?

Discussion

44.	State the name and the range of wavelength of the invisible electromagnetic waves beyond the red end of visible spectrum.
Answer» State the name and the range of wavelength of the invisible electromagnetic waves beyond the red end of visible spectrum.

Discussion

45.	A longer wire has a ___ resistance than a shorter wire of the same thickness and same material.
Answer» A longer wire has a ___ resistance than a shorter wire of the same thickness and same material.

Discussion

46.	Find the binding energy per nucleon of 197 79Au if its atomic mass is 196.96 u. The atomic mass of 11H is 1.007825 u, mass of neuton, mn=1.008665 u, mp=1.007276 u. c2=931 MeVu. Remember that atomic mass also contains the mass of electrons.
Answer» Find the binding energy per nucleon of $_{79}^{197} A u$ if its atomic mass is 196.96 u. The atomic mass of $_{1}^{1} H$ is 1.007825 u, mass of neuton, $m_{n} = 1.008665 u, m_{p} = 1.007276 u . c^{2} = 931 \frac{M e V}{u} .$ Remember that atomic mass also contains the mass of electrons.

Discussion

47.	Prove that 1 Joule is equivalent to 1 vas
Answer» Prove that 1 Joule is equivalent to 1 vas

Discussion

48.	A bulb is rated at 200V,40W. What is the resistance? 5 such bulbs are lighted for 5 hours. Calculate the electrical energy consumed. Find the cost if the rate is Rs 5.10 per kWh
Answer» A bulb is rated at 200V,40W. What is the resistance? 5 such bulbs are lighted for 5 hours. Calculate the electrical energy consumed. Find the cost if the rate is Rs 5.10 per kWh

Discussion

49.	Electric current in conductors is produced due to the flow of
Answer» Electric current in conductors is produced due to the flow of

Discussion

50.	A substance of mass 75 gms with a specific heat of 0.6 has its temperature increased by 20°C. What amount of heat needs to be provided for this increase in temperature to be possible?
Answer» A substance of mass 75 gms with a specific heat of 0.6 has its temperature increased by 20°C. What amount of heat needs to be provided for this increase in temperature to be possible?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

200 g of hot water at 80∘C is added to 300 g of cold water at 10∘C.Neglecting the heat taken by the container,calculate the final temperature of the mixture of water.Specific heat capacity of water =4200 J kg−1 K−1 .

Which one of the following is a characteristic of cropland ecosystem?

A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R′, then the ratio RR′ is

Vm-1 is the unit of : A) potential B) electric field intensity C) electric current D) electric potential energy

Choose the correct statement based on the penetrating power.

Compare the power used in 2 ohm resistor in each of the following circuits a)6 volt battery in series with 1 ohm and 2 ohm resistors And b)4 volt battery in parallel with 12 ohm and 2 ohm resistors

A lens of focal length 20 cm is used to produce a ten times magnified image of a film slide on a screen. How far must the slide be placed from the lens?

How a cell or a battery produces potential difference when connected to a circuit? Or What happens inside a cell due to which current flow?

What is the difference between electric power, electrical energy, heat produced by a conductor on current being passed through it?

Why is tidal energy not likely to be the potential source of energy?

A doctor has prescribed a corrective lens of power+1.5 doctor. Find the focal length (a) is the prescribed lens diverging or converging

A concave lens made of a material of refractive index n1 is kept in a medium of refractive index n2. A parallel beam of light is incident on the lens. Complete the path of rays of light emerging from the concave lens if: (a) n1&gt;n2 and (b) n1&lt;n2. [5 MARKS]

A convex lens of power 5D is placed at a distance of 30 cm from a screen. At what distance from the lens should the screen be placed so that its image is formed on the screen?

Which phenomenon is responsible for making the path of light visible?

An object 20 cm from a spherical mirror gives rise to a virtual image 15 cm behind the mirror. Determine the magnification of the image and the type of mirror used.

A radioactive element 88X240 emits a few radiations to become 90Y220 . Calculate the number of alpha &amp; beta particles emitted.

A person suffering from the eye-defect myopia (short-sightedness) can see clearly only up to a distance of 2 metres. What is the nature and power of lens required to rectify this defect ?

Which of the following statement is correct

A ray of light incidents on a plane mirror at an angle of The deviation produced in the ray is

A ray of light is incident on a denser medium at an angle 60∘. The angle of refraction is different for different mediums for the same angle of incidence i.e. 60∘. In which medium the speed of light is slowest?

The radius of curvature of the path of the charged particle in a uniform magnetic field is directly proportional to

An object is placed perpendicular to principal axis of a convex lens of focal length 20cm.the distance of object from lens is 30cm Find the position,magn magnifica and Nature of image

Name the force required for uniform circular motion.

AC generator will have ___ rings.

The circuit which is made up of various seperately manufactured components is known as:

In the given figure, when light emerges from the glass slab, the light ray bends ___

Explain the different parts of a screw gauge with a detailed diagram.

derive a relation between relative and absolute refractive index

Will the rainbow form when the sunlight is red or during the sunset and sunrise

Soft iron core is used in dc motor and ac generator. Explain ?

An electric kettle is rated 3 kW, 250 V. Give reason whether this kettle can be used in a circuit which contains a fuse of current rating 13 A.

Sound cannot travel in

When voltmeter is attached in series then ammeter shows zero.why?

Name the defect of vision which can be corrected by a diverging lens. Show clearly by a ray diagram how the lens corrects the defect.

Light enters from air to glass plate having refractive index 1.5. The speed of light in glass is

Calculate the kinetic energy of bob of a simple pendulum when it reaches the mean position after releasing from the extreme position as shown in the figure.

A body is vibrating in simple harmonic motion with an amplitude of 0.06 m and frequency of 15 Hz. The velocity and acceleration of body is

(a) State the position of object for which the image formed by a concave mirror is of same size. (b) Write two more characteristics of the image.

Name the waves (a) of lowest wavelength, (b) used for taking photographs in dark, (c) produced by the changes in the nucleus of an atom, (d) of wavelength nearly 0.1 nm.

How should the object be placed to get the laterally inverted image?

What is the use and purpose of a resistor in a electrical circuit?

State the name and the range of wavelength of the invisible electromagnetic waves beyond the red end of visible spectrum.

A longer wire has a ___ resistance than a shorter wire of the same thickness and same material.

Find the binding energy per nucleon of 197 79Au if its atomic mass is 196.96 u. The atomic mass of 11H is 1.007825 u, mass of neuton, mn=1.008665 u, mp=1.007276 u. c2=931 MeVu. Remember that atomic mass also contains the mass of electrons.

Prove that 1 Joule is equivalent to 1 v*a*s

A bulb is rated at 200V,40W. What is the resistance? 5 such bulbs are lighted for 5 hours. Calculate the electrical energy consumed. Find the cost if the rate is Rs 5.10 per kWh

Electric current in conductors is produced due to the flow of

A substance of mass 75 gms with a specific heat of 0.6 has its temperature increased by 20°C. What amount of heat needs to be provided for this increase in temperature to be possible?

A concave lens made of a material of refractive index n1 is kept in a medium of refractive index n2. A parallel beam of light is incident on the lens. Complete the path of rays of light emerging from the concave lens if: (a) n1>n2 and (b) n1<n2. [5 MARKS]

A radioactive element 88X240 emits a few radiations to become 90Y220 . Calculate the number of alpha & beta particles emitted.

Prove that 1 Joule is equivalent to 1 vas