16569 + Interview Questions in Physics

1.	Microwaves are being used in which of the following cases?
Answer» Microwaves are being used in which of the following cases?

Discussion

2.	(a) If the image formed by a mirror for all positions of the object placed in front of it is always diminished, erect and virtual, name the type of the mirror used and also draw a ray diagram to justify your answer. Write one use such mirrors are put to and why. (b) Define the radius of curvature of spherical mirrors. Find the nature and focal length of spherical mirror whose radius of curvature is +24 cm.
Answer» (a) If the image formed by a mirror for all positions of the object placed in front of it is always diminished, erect and virtual, name the type of the mirror used and also draw a ray diagram to justify your answer. Write one use such mirrors are put to and why. (b) Define the radius of curvature of spherical mirrors. Find the nature and focal length of spherical mirror whose radius of curvature is +24 cm.

Discussion

3.	Explain two main advantages associated with water harvesting at the community level.
Answer» Explain two main advantages associated with water harvesting at the community level.

Discussion

4.	At the interface of two transparent mediums at the point of incidence, the incident ray, the refracted ray and the normal all lie in_____
Answer» At the interface of two transparent mediums at the point of incidence, the incident ray, the refracted ray and the normal all lie in_____

Discussion

5.	State Fleming's left hand rule.
Answer» State Fleming's left hand rule.

Discussion

6.	___ is the device which controls (prevents or allows) current to flow through it.
Answer» ___ is the device which controls (prevents or allows) current to flow through it.

Discussion

7.	A converging beam of rays is incident on a diverging lens. After passing through the lens, the rays intersect at a point 15 cm from the lens. If the lens is removed, the point where the rays meet, moves 5 cm closer to the mounting that holds the lens. Find the focal length of the lens.
Answer» A converging beam of rays is incident on a diverging lens. After passing through the lens, the rays intersect at a point $15 c m$ from the lens. If the lens is removed, the point where the rays meet, moves $5 c m$ closer to the mounting that holds the lens. Find the focal length of the lens.

Discussion

8.	Name the unit of electrical resistance and give its symbol.
Answer» Name the unit of electrical resistance and give its symbol.

Discussion

9.	The wooden door of a building is 3 m broad. It can be opened by applying a force of 100 N at the middle of the door. Calculate the least force which can open the door.
Answer» The wooden door of a building is $3 m$ broad. It can be opened by applying a force of $100 N$ at the middle of the door. Calculate the least force which can open the door.

Discussion

10.	State the factors on which the strenth of electric current flowing in a given conductor depends.
Answer» State the factors on which the strenth of electric current flowing in a given conductor depends.

Discussion

11.	What do we mean by the intensity of a light ray? when a light ray is repeatedly reflected by a set of parallel plane mirrors the intensity of the light ray decreases after some reflections . is this because of absorption of some amount of light by mirrors ?
Answer» What do we mean by the intensity of a light ray? when a light ray is repeatedly reflected by a set of parallel plane mirrors the intensity of the light ray decreases after some reflections . is this because of absorption of some amount of light by mirrors ?

Discussion

12.	A battery of e.m.f. 15 V and internal resistance 2 Ω is connected to two resistors of resistances 4 ohm and 6 ohm joined in series. Find the electrical energy spent per minute in 6 ohm resistor.
Answer» A battery of e.m.f. 15 V and internal resistance 2 $Ω$ is connected to two resistors of resistances 4 ohm and 6 ohm joined in series. Find the electrical energy spent per minute in 6 ohm resistor.

Discussion

13.	Question 14 (ii) Compare the power used in the 2Ω resistor in each of the following circuits: (ii) a 4 V battery in parallel with 12Ω and 2Ω resistors.
Answer» Question 14 (ii) Compare the power used in the $2 Ω$ resistor in each of the following circuits: (ii) a 4 V battery in parallel with $12 Ω$ and $2 Ω$ resistors.

Discussion

14.	The heating curve for ice initially at a particular pressure is given. Choose the correct heating curve for the ice initially at 0 ∘C, if the pressure is decreased.
Answer» The heating curve for ice initially at a particular pressure is given. Choose the correct heating curve for the ice initially at $0^{\circ} C$ , if the pressure is decreased.

14.

The heating curve for ice initially at a particular pressure is given. Choose the correct heating curve for the ice initially at 0 ∘C, if the pressure is decreased.

Answer»

The heating curve for ice initially at a particular pressure is given.

Choose the correct heating curve for the ice initially at $0^{\circ} C$ , if the pressure is decreased.

Discussion

15.	What is the power of accommodation?
Answer» What is the power of accommodation?

Discussion

16.	The drift speed of electrons in a wire is very less .Then how do these electrons are able to light up a bulb, the moment we turn the switch on?
Answer» The drift speed of electrons in a wire is very less .Then how do these electrons are able to light up a bulb, the moment we turn the switch on?

Discussion

17.	Raindrops disperse light. But for how long? A raindrop falls to the ground immediately. But we can see the rainbow for quite a long time. How?
Answer» Raindrops disperse light. But for how long? A raindrop falls to the ground immediately. But we can see the rainbow for quite a long time. How?

Discussion

18.	Ionisation energy ..................... down a group and ..................... along a period. __
Answer» Ionisation energy ..................... down a group and ..................... along a period. __

Discussion

19.	The mass numbers of four elements A, B, C and D are 2, 20, 135 and 235, respectively. Which one of them will be most suitable to make : (i) an atom bomb, and (ii) a hydrogen bomb ?
Answer» The mass numbers of four elements A, B, C and D are 2, 20, 135 and 235, respectively. Which one of them will be most suitable to make : (i) an atom bomb, and (ii) a hydrogen bomb ?

Discussion

20.	In mechanics, if the net external force on the particle is zero, then the particle is said to be in state of
Answer» In mechanics, if the net external force on the particle is zero, then the particle is said to be in state of

Discussion

21.	What is the single movable pulley ? What is its mechanical advantage in the ideal case ?
Answer» What is the single movable pulley ? What is its mechanical advantage in the ideal case ?

Discussion

22.	Can we use a solenoid instead of an armature in any of the generators?
Answer» Can we use a solenoid instead of an armature in any of the generators?

Discussion

23.	___ sources of energy are renewable sources of energy which do not cause enviroonmental pollution.
Answer» ___ sources of energy are renewable sources of energy which do not cause enviroonmental pollution.

Discussion

24.	More amount of heat energy can be produced in a solar cooker by using:
Answer» More amount of heat energy can be produced in a solar cooker by using:

Discussion

25.	(a) What is biomass ? Give three examples of biomass. (b) Name the biomass which is still widely used as a source of heat energy in many households of our country .
Answer» (a) What is biomass ? Give three examples of biomass. (b) Name the biomass which is still widely used as a source of heat energy in many households of our country .

Discussion

26.	Explanation of magnification of light in spherical mirrors
Answer» Explanation of magnification of light in spherical mirrors

Discussion

27.	__ is the state of matter that has the tendency to maintain their shapes when subjected to the outside force.
Answer» __ is the state of matter that has the tendency to maintain their shapes when subjected to the outside force.

Discussion

28.	Explain atmospheric refraction in detail.
Answer» Explain atmospheric refraction in detail.

Discussion

29.	An electric current is induced in a circuit when ____
Answer» An electric current is induced in a circuit when ____

Discussion

30.	During a race, you run on a leveled track accelerating and acquire a velocity 3 times your initial velocity. What would be the change in your potential energy?
Answer» During a race, you run on a leveled track accelerating and acquire a velocity 3 times your initial velocity. What would be the change in your potential energy?

Discussion

31.	How does pupil work? What is persistence of vision and power of accommodation? [5 MARKS]
Answer» How does pupil work? What is persistence of vision and power of accommodation? [5 MARKS]

Discussion

32.	At what temperature (in ∘C) will the velocity of sound in air be 1.5 times its velocity at 0 ∘C? (The velocity of sound in air at 0 ∘C=330 m s−1)
Answer» At what temperature (in $^{\circ} C$ ) will the velocity of sound in air be $1.5$ times its velocity at $0^{\circ} C$ ? (The velocity of sound in air at $0^{\circ} C = 330 {m s}^{- 1}$ )

Discussion

33.	Define angle of prism
Answer» Define angle of prism

Discussion

34.	An electric bulb is connected to a 220 V power supply line. If the bulb draws a current of 0.5 A, calculate the power of the bulb.
Answer» An electric bulb is connected to a 220 V power supply line. If the bulb draws a current of 0.5 A, calculate the power of the bulb.

Discussion

35.	Which mirror is used as a rear-view mirror in vehicles?
Answer» Which mirror is used as a rear-view mirror in vehicles?

Discussion

36.	The temperature and the dew point in an open room are 20 ∘C and 10 ∘C. If the room temperature drops to 15 ∘C, what will be the new dew point?
Answer» The temperature and the dew point in an open room are $20^{\circ} C$ and $10^{\circ} C$ . If the room temperature drops to $15^{\circ} C$ , what will be the new dew point?

Discussion

37.	Is it dangerous to touch a neutral wire
Answer» Is it dangerous to touch a neutral wire

Discussion

38.	How is voltmeter connected in the circuit to measure potential difference between two points?
Answer» How is voltmeter connected in the circuit to measure potential difference between two points?

Discussion

39.	What is the SI unit of (i) electric energy, and (ii) electric power?
Answer» What is the SI unit of (i) electric energy, and (ii) electric power?

Discussion

40.	Name two sources, each of infrared radiations and ultraviolet radiations.
Answer» Name two sources, each of infrared radiations and ultraviolet radiations.

Discussion

41.	Fuel formed under the earth's surface by the decomposition of organic matter is called ___ fuel.
Answer» Fuel formed under the earth's surface by the decomposition of organic matter is called ___ fuel.

Discussion

42.	What is the difference egistion and excretion
Answer» What is the difference egistion and excretion

Discussion

43.	All washing machines have an agitator or pulsator. Why?
Answer» All washing machines have an agitator or pulsator. Why?

Discussion

44.	Why there is hot water at the below of the hoover dam
Answer» Why there is hot water at the below of the hoover dam

Discussion

45.	Write the name of the system/ arrangement that connects different power generating centers and distribution system?
Answer» Write the name of the system/ arrangement that connects different power generating centers and distribution system?

Discussion

46.	Size of an image of the object formed by a mirror having a focal length of 26C.M is observed to be reduced to 1/3rd of its size at what distance the object has been placed from the mirror. What is the nature of the image and mirror
Answer» Size of an image of the object formed by a mirror having a focal length of 26C.M is observed to be reduced to 1/3rd of its size at what distance the object has been placed from the mirror. What is the nature of the image and mirror

Discussion

47.	The given figure shows a battery having an EMF of 9V and internal resistance of 0.6Ω, connected to three resistors A, B and C. ? (a) Calculate the combined resistance of B and C. (b) Calculate the total resistance of A, B and C. (c) Calculate the total resistance of the circuit. (d) Calculate the current in each of the three resistors A, B and C. [5 MARKS]
Answer» The given figure shows a battery having an EMF of 9V and internal resistance of $0.6 Ω$ , connected to three resistors A, B and C. ? (a) Calculate the combined resistance of B and C. (b) Calculate the total resistance of A, B and C. (c) Calculate the total resistance of the circuit. (d) Calculate the current in each of the three resistors A, B and C. [5 MARKS]

Discussion

48.	The work done in moving a body of mass 4kg with uniform velocity of 5ms−1 for 10 seconds on a surface of μ=0.4(takeg=10 m/s2)
Answer» The work done in moving a body of mass 4kg with uniform velocity of $5 m s^{- 1}$ for 10 seconds on a surface of $μ = 0.4 (t a k e g = 10 m / s^{2})$

Discussion

49.	why is magnification in terms of mirrors -v/u whereas in lenses it is v/u ?
Answer» why is magnification in terms of mirrors -v/u whereas in lenses it is v/u ?

Discussion

50.	An aeroplane at an altitude of 250 m observes the angle of depression of two boats on the opposite banks of a river to be 45∘ and 60∘ respectively. Find the width of the river.
Answer» An aeroplane at an altitude of 250 m observes the angle of depression of two boats on the opposite banks of a river to be $45^{\circ}$ and $60^{\circ}$ respectively. Find the width of the river.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Microwaves are being used in which of the following cases?

Explain two main advantages associated with water harvesting at the community level.

At the interface of two transparent mediums at the point of incidence, the incident ray, the refracted ray and the normal all lie in_____

State Fleming's left hand rule.

___ is the device which controls (prevents or allows) current to flow through it.

A converging beam of rays is incident on a diverging lens. After passing through the lens, the rays intersect at a point 15 cm from the lens. If the lens is removed, the point where the rays meet, moves 5 cm closer to the mounting that holds the lens. Find the focal length of the lens.

Name the unit of electrical resistance and give its symbol.

The wooden door of a building is 3 m broad. It can be opened by applying a force of 100 N at the middle of the door. Calculate the least force which can open the door.

State the factors on which the strenth of electric current flowing in a given conductor depends.

What do we mean by the intensity of a light ray? when a light ray is repeatedly reflected by a set of parallel plane mirrors the intensity of the light ray decreases after some reflections . is this because of absorption of some amount of light by mirrors ?

A battery of e.m.f. 15 V and internal resistance 2 Ω is connected to two resistors of resistances 4 ohm and 6 ohm joined in series. Find the electrical energy spent per minute in 6 ohm resistor.

Question 14 (ii) Compare the power used in the 2Ω resistor in each of the following circuits: (ii) a 4 V battery in parallel with 12Ω and 2Ω resistors.

The heating curve for ice initially at a particular pressure is given. Choose the correct heating curve for the ice initially at 0 ∘C, if the pressure is decreased.

What is the power of accommodation?

The drift speed of electrons in a wire is very less .Then how do these electrons are able to light up a bulb, the moment we turn the switch on?

Raindrops disperse light. But for how long? A raindrop falls to the ground immediately. But we can see the rainbow for quite a long time. How?

Ionisation energy ..................... down a group and ..................... along a period. __

The mass numbers of four elements A, B, C and D are 2, 20, 135 and 235, respectively. Which one of them will be most suitable to make : (i) an atom bomb, and (ii) a hydrogen bomb ?

In mechanics, if the net external force on the particle is zero, then the particle is said to be in state of

What is the single movable pulley ? What is its mechanical advantage in the ideal case ?

Can we use a solenoid instead of an armature in any of the generators?

___ sources of energy are renewable sources of energy which do not cause enviroonmental pollution.

More amount of heat energy can be produced in a solar cooker by using:

(a) What is biomass ? Give three examples of biomass. (b) Name the biomass which is still widely used as a source of heat energy in many households of our country .

Explanation of magnification of light in spherical mirrors

__ is the state of matter that has the tendency to maintain their shapes when subjected to the outside force.

Explain atmospheric refraction in detail.

An electric current is induced in a circuit when ____

During a race, you run on a leveled track accelerating and acquire a velocity 3 times your initial velocity. What would be the change in your potential energy?

How does pupil work? What is persistence of vision and power of accommodation? [5 MARKS]

At what temperature (in ∘C) will the velocity of sound in air be 1.5 times its velocity at 0 ∘C? (The velocity of sound in air at 0 ∘C=330 m s−1)

Define angle of prism

An electric bulb is connected to a 220 V power supply line. If the bulb draws a current of 0.5 A, calculate the power of the bulb.

Which mirror is used as a rear-view mirror in vehicles?

The temperature and the dew point in an open room are 20 ∘C and 10 ∘C. If the room temperature drops to 15 ∘C, what will be the new dew point?

Is it dangerous to touch a neutral wire

How is voltmeter connected in the circuit to measure potential difference between two points?

What is the SI unit of (i) electric energy, and (ii) electric power?

Name two sources, each of infrared radiations and ultraviolet radiations.

Fuel formed under the earth's surface by the decomposition of organic matter is called ___ fuel.

What is the difference egistion and excretion

All washing machines have an agitator or pulsator. Why?

Why there is hot water at the below of the hoover dam

Write the name of the system/ arrangement that connects different power generating centers and distribution system?

Size of an image of the object formed by a mirror having a focal length of 26C.M is observed to be reduced to 1/3rd of its size at what distance the object has been placed from the mirror. What is the nature of the image and mirror

The work done in moving a body of mass 4kg with uniform velocity of 5ms−1 for 10 seconds on a surface of μ=0.4(takeg=10 m/s2)

why is magnification in terms of mirrors -v/u whereas in lenses it is v/u ?

An aeroplane at an altitude of 250 m observes the angle of depression of two boats on the opposite banks of a river to be 45∘ and 60∘ respectively. Find the width of the river.