16569 + Interview Questions in Physics

1.	Total internal reflection of light can occur when light travels from __________.
Answer» Total internal reflection of light can occur when light travels from __________.

Discussion

2.	Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?
Answer» Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?

Discussion

3.	The resistivity vs. Temperature variation of a certain material is shown below. At 2∘C, this material will act as?
Answer» The resistivity vs. Temperature variation of a certain material is shown below. At $2^{\circ} C$ , this material will act as?

Discussion

4.	What are brushes in an electric motor Difference between split ring and slip ring What is commutator
Answer» What are brushes in an electric motor Difference between split ring and slip ring What is commutator

Discussion

5.	I the chapter 'electricity', the cideo regarding electric power states that 1kwh=3.6x10^9 Joules. But it is actually 1kwh=3.6x10^6 Joules. It is also on the internet. Please take this issue to your notice.
Answer» I the chapter 'electricity', the cideo regarding electric power states that 1kwh=3.6x10^9 Joules. But it is actually 1kwh=3.6x10^6 Joules. It is also on the internet. Please take this issue to your notice.

Discussion

6.	If a concave mirror has a focal length of 10 cm, find the two positions where an object can be placed to give, in each case, an image twice the height of the object.
Answer» If a concave mirror has a focal length of 10 cm, find the two positions where an object can be placed to give, in each case, an image twice the height of the object.

Discussion

7.	The screening effect of electron of s, p, d and f orbitals of a given shell of an atom on its outer shell electrons are in the order of:
Answer» The screening effect of electron of s, p, d and f orbitals of a given shell of an atom on its outer shell electrons are in the order of:

Discussion

8.	Question 2 A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is (a) -30 cm (b) -20 cm (c) -40 cm (d) -60 cm
Answer» Question 2 A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is (a) -30 cm (b) -20 cm (c) -40 cm (d) -60 cm

Discussion

9.	What is permeability of free space ?
Answer» What is permeability of free space ?

Discussion

10.	A wire of resistance 20 Ω is bent in the form of a circle. Find the equivalent resistance between two diametrically opposite ends.
Answer» A wire of resistance 20 $Ω$ is bent in the form of a circle. Find the equivalent resistance between two diametrically opposite ends.

Discussion

11.	For Fleming's left-hand rule, wirte down the three things that are 90o to each other, and next to each one writer down the finger or thumb that represents it.
Answer» For Fleming's left-hand rule, wirte down the three things that are $90^{o}$ to each other, and next to each one writer down the finger or thumb that represents it.

Discussion

12.	Two certain appliances A and B are rated as 10kW, 230V and 100W, 230V. Which of the following statement can be regarded correct according to the given data?
Answer» Two certain appliances A and B are rated as 10kW, 230V and 100W, 230V. Which of the following statement can be regarded correct according to the given data?

Discussion

13.	What is critical angle? Is it 90 degree? What happens when angle is more than critica angle?
Answer» What is critical angle? Is it 90 degree? What happens when angle is more than critica angle?

Discussion

14.	A teacher demonstrated the experiment "To find the equivalent resistance of two resistors when connected in series". Rahul and Raghav after observing the experiment concluded that : Rahul: The current passing through the resistors in series combination is same. Raghav : The potential difference across the ends of the circuit is greater than the sum of potential differences across each of the resistors. Out of the options given below which one is correct? (a) Rahul is right, Raghav is wrong. (b) Raghav is right, Rahul is wrong. (c) Both Rahul and Raghav are wrong. (d) Both Rahul and Raghav are right.
Answer» A teacher demonstrated the experiment "To find the equivalent resistance of two resistors when connected in series". Rahul and Raghav after observing the experiment concluded that : Rahul: The current passing through the resistors in series combination is same. Raghav : The potential difference across the ends of the circuit is greater than the sum of potential differences across each of the resistors. Out of the options given below which one is correct? (a) Rahul is right, Raghav is wrong. (b) Raghav is right, Rahul is wrong. (c) Both Rahul and Raghav are wrong. (d) Both Rahul and Raghav are right.

Discussion

15.	Give reason for the following : (i) Why are copper and aluminium wires used as connecting wires ? (ii) Why is tungsten used for filaments of electric lamps ? (iii) Why is lead-tin alloy used for fuse wires ?
Answer» Give reason for the following : (i) Why are copper and aluminium wires used as connecting wires ? (ii) Why is tungsten used for filaments of electric lamps ? (iii) Why is lead-tin alloy used for fuse wires ?

Discussion

16.	If 2.9×1017 J of energy was released during a nuclear fission, determine the loss in the mass in kg.3.2
Answer» If $2.9 \times 10^{17} J$ of energy was released during a nuclear fission, determine the loss in the mass in $kg$ . 3.2

Discussion

17.	A fighter jet is flying at 2km height. After being shot down by a tank vertically below it, the plane crashed in the woods 2km east of the tank. Which of these is the correct displacement vector from the point of impact?
Answer» A fighter jet is flying at 2km height. After being shot down by a tank vertically below it, the plane crashed in the woods 2km east of the tank. Which of these is the correct displacement vector from the point of impact?

Discussion

18.	What role does the opposite parallel surfaces of a glass slab play in lateral shift of light passing through them?
Answer» What role does the opposite parallel surfaces of a glass slab play in lateral shift of light passing through them?

Discussion

19.	How is the strength of magnetic field affected when current increases?
Answer» How is the strength of magnetic field affected when current increases?

Discussion

20.	Which of the following has longest wavelength?
Answer» Which of the following has longest wavelength?

Discussion

21.	What is electric current and it's affect in our life
Answer» What is electric current and it's affect in our life

Discussion

22.	In the circuit diagram shown, the two resistance wires A and B are of same length and same material, but A is thicker than B. Which ammeter A1 or A2 will indicate higher reading for current? Give reason.
Answer» In the circuit diagram shown, the two resistance wires A and B are of same length and same material, but A is thicker than B. Which ammeter $A_{1}$ or $A_{2}$ will indicate higher reading for current? Give reason.

22.

In the circuit diagram shown, the two resistance wires A and B are of same length and same material, but A is thicker than B. Which ammeter A1 or A2 will indicate higher reading for current? Give reason.

Answer»

In the circuit diagram shown, the two resistance wires A and B are of same length and same material, but A is thicker than B. Which ammeter $A_{1}$ or $A_{2}$ will indicate higher reading for current? Give reason.

Discussion

23.	What will happen when we do wiring of a house with 2.5mm2 instead of 1mm2 cross section area of wire. Is extra current used or current is wasted?
Answer» What will happen when we do wiring of a house with 2.5mm² instead of 1mm²cross section area of wire. Is extra current used or current is wasted?

Discussion

24.	Choose the activity, which does NOT fall under 'reduce' strategy?
Answer» Choose the activity, which does NOT fall under 'reduce' strategy?

Discussion

25.	When the direction of current through the conductor is reversed, then direction of
Answer» When the direction of current through the conductor is reversed, then direction of

Discussion

26.	Two parallel wires P and Q carry currents shown by arrows. Will the wires P and Q:
Answer» Two parallel wires P and Q carry currents shown by arrows. Will the wires P and Q:

26.

Two parallel wires P and Q carry currents shown by arrows. Will the wires P and Q:

Answer»

Two parallel wires P and Q carry currents shown by arrows. Will the wires P and Q:

Discussion

27.	Name any four fractions obtained from petroleum which are used as fuels.
Answer» Name any four fractions obtained from petroleum which are used as fuels.

Discussion

28.	The angle of incidence for a ray of light passing through the centre of curvature of a concave mirror is : (a) 45∘ (b) 90∘ (c) 0∘ (d) 180∘
Answer» The angle of incidence for a ray of light passing through the centre of curvature of a concave mirror is : (a) $45^{\circ}$ (b) $90^{\circ}$ (c) $0^{\circ}$ (d) $180^{\circ}$

Discussion

29.	____________________ is an eye defect in which distant objects appear blurred
Answer» ____________________ is an eye defect in which distant objects appear blurred

Discussion

30.	(a) Draw the magnetic lines of force due to a circular wire carrying current. (b) What are the various ways in which the strength of the magnetic field produced by a current-carrying circular coil can be increased ?
Answer» (a) Draw the magnetic lines of force due to a circular wire carrying current. (b) What are the various ways in which the strength of the magnetic field produced by a current-carrying circular coil can be increased ?

30.

(a) Draw the magnetic lines of force due to a circular wire carrying current. (b) What are the various ways in which the strength of the magnetic field produced by a current-carrying circular coil can be increased ?

Answer»

(a) Draw the magnetic lines of force due to a circular wire carrying current.

(b) What are the various ways in which the strength of the magnetic field produced by a current-carrying circular coil can be increased ?

Discussion

31.	Two ways by which the magnetic field of a solenoid can be made stronger are
Answer» Two ways by which the magnetic field of a solenoid can be made stronger are

Discussion

32.	A TV set consumes an electric power of 230 watts and runs on 230 volts mains supply. The correct fuse for this TV set is : (a) 5 A (b) 3 A (c) 1 A (d) 2 A
Answer» A TV set consumes an electric power of 230 watts and runs on 230 volts mains supply. The correct fuse for this TV set is : (a) 5 A (b) 3 A (c) 1 A (d) 2 A

32.

A TV set consumes an electric power of 230 watts and runs on 230 volts mains supply. The correct fuse for this TV set is : (a) 5 A (b) 3 A (c) 1 A (d) 2 A

Answer»

A TV set consumes an electric power of 230 watts and runs on 230 volts mains supply. The correct fuse for this TV set is :

(a) 5 A (b) 3 A (c) 1 A (d) 2 A

Discussion

33.	Explain the importance of using in a household electic circuit (i) fuse, and (ii) earthing wire.
Answer» Explain the importance of using in a household electic circuit (i) fuse, and (ii) earthing wire.

Discussion

34.	Compare and contrast biomass and hydroelectricity as sources of energy.
Answer» Compare and contrast biomass and hydroelectricity as sources of energy.

Discussion

35.	Which of the following define the work most accurately? 1. Work is the product of displacement and component of force in the direction of displacement. 2. Work is the product of force and displacement. 3. Work is the product of force and component of displacement in the direction of force. 4. Work is the product of distance and force applied.
Answer» Which of the following define the work most accurately? 1. Work is the product of displacement and component of force in the direction of displacement. 2. Work is the product of force and displacement. 3. Work is the product of force and component of displacement in the direction of force. 4. Work is the product of distance and force applied.

Discussion

36.	A fielder pulls his hands gradually with the moving ball while holding a catch. Why does he do this?
Answer» A fielder pulls his hands gradually with the moving ball while holding a catch. Why does he do this?

Discussion

37.	What are "hot spots"?
Answer» What are "hot spots"?

Discussion

38.	A person is trying to push a car up hill. But he starts sliding backward along with car, work done by the person on the car is
Answer» A person is trying to push a car up hill. But he starts sliding backward along with car, work done by the person on the car is

Discussion

39.	According to the new cartesian sign convention,
Answer» According to the new cartesian sign convention,

Discussion

40.	The power of the lens is -2D. Is the lens concave or convex?
Answer» The power of the lens is -2D. Is the lens concave or convex?

Discussion

41.	To determine the approximate value of the focal length of a given concave mirror, you focus the image of a distant object formed by the mirror on a screen. The image obtained on the screen, as compared to the object is always : (a) Laterally inverted and diminished (b) Inverted and diminished (c) Erect and diminished (d) Erect and highly diminished
Answer» To determine the approximate value of the focal length of a given concave mirror, you focus the image of a distant object formed by the mirror on a screen. The image obtained on the screen, as compared to the object is always : (a) Laterally inverted and diminished (b) Inverted and diminished (c) Erect and diminished (d) Erect and highly diminished

Discussion

42.	Why is the cutting edge of the scissor made longer than the cutting edge of a mettal
Answer» Why is the cutting edge of the scissor made longer than the cutting edge of a mettal

Discussion

43.	How much work is needed to be done on A ball of mass 100 g to give it a momentum of 5 kgm/s.
Answer» How much work is needed to be done on A ball of mass 100 g to give it a momentum of 5 kgm/s.

Discussion

44.	Why are the coils of electric irons and electric toasters amde of an alloy rather than a pure metal?
Answer» Why are the coils of electric irons and electric toasters amde of an alloy rather than a pure metal?

Discussion

45.	Which of the following refers to a vertical straight line?
Answer» Which of the following refers to a vertical straight line?

Discussion

46.	If 'S' is the surface area of the right circular cone whose h and α are the height and semi- vertical angle, S is equal to-
Answer» If 'S' is the surface area of the right circular cone whose h and α are the height and semi- vertical angle, S is equal to-

Discussion

47.	What is the (a) highest (b) lowest total resistance, that can be secured by combinations of four coils of resistances 4 ohms, 8 ohms, 12 ohms and 24 ohms?
Answer» What is the (a) highest (b) lowest total resistance, that can be secured by combinations of four coils of resistances 4 ohms, 8 ohms, 12 ohms and 24 ohms?

Discussion

48.	An object moves from point A to point B to point C, then back to point B and then to point C along the line shown in the figure. Find the magnitude of displacement covered by the moving object in km.
Answer» An object moves from point A to point B to point C, then back to point B and then to point C along the line shown in the figure. Find the magnitude of displacement covered by the moving object in $km$ .

Discussion

49.	Considering a long current carrying solenoid. Among the following statements, the incorrect statement is :
Answer» Considering a long current carrying solenoid. Among the following statements, the incorrect statement is :

Discussion

50.	(a) How does the angle of deviation produced by a prism change with an increase in the angle of incidence? Draw a curve showing the variation in the angle of deviation with the angle of incidence at a prism surface. (b) Using the curve in part (a) above, how do you infer that for a given prism, the angle of minimum deviation δmin is unique for the given light.
Answer» (a) How does the angle of deviation produced by a prism change with an increase in the angle of incidence? Draw a curve showing the variation in the angle of deviation with the angle of incidence at a prism surface. (b) Using the curve in part (a) above, how do you infer that for a given prism, the angle of minimum deviation $δ_{m i n}$ is unique for the given light.

50.

(a) How does the angle of deviation produced by a prism change with an increase in the angle of incidence? Draw a curve showing the variation in the angle of deviation with the angle of incidence at a prism surface. (b) Using the curve in part (a) above, how do you infer that for a given prism, the angle of minimum deviation δmin is unique for the given light.

Answer»

(a) How does the angle of deviation produced by a prism change with an increase in the angle of incidence? Draw a curve showing the variation in the angle of deviation with the angle of incidence at a prism surface.

(b) Using the curve in part (a) above, how do you infer that for a given prism, the angle of minimum deviation $δ_{m i n}$ is unique for the given light.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Total internal reflection of light can occur when light travels from __________.

Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?

The resistivity vs. Temperature variation of a certain material is shown below. At 2∘C, this material will act as?

What are brushes in an electric motor Difference between split ring and slip ring What is commutator

I the chapter 'electricity', the cideo regarding electric power states that 1kwh=3.6x10^9 Joules. But it is actually 1kwh=3.6x10^6 Joules. It is also on the internet. Please take this issue to your notice.

If a concave mirror has a focal length of 10 cm, find the two positions where an object can be placed to give, in each case, an image twice the height of the object.

The screening effect of electron of s, p, d and f orbitals of a given shell of an atom on its outer shell electrons are in the order of:

Question 2 A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is (a) -30 cm (b) -20 cm (c) -40 cm (d) -60 cm

What is permeability of free space ?

A wire of resistance 20 Ω is bent in the form of a circle. Find the equivalent resistance between two diametrically opposite ends.

For Fleming's left-hand rule, wirte down the three things that are 90o to each other, and next to each one writer down the finger or thumb that represents it.

Two certain appliances A and B are rated as 10kW, 230V and 100W, 230V. Which of the following statement can be regarded correct according to the given data?

What is critical angle? Is it 90 degree? What happens when angle is more than critica angle?

Give reason for the following : (i) Why are copper and aluminium wires used as connecting wires ? (ii) Why is tungsten used for filaments of electric lamps ? (iii) Why is lead-tin alloy used for fuse wires ?

If 2.9×1017 J of energy was released during a nuclear fission, determine the loss in the mass in kg.3.2

A fighter jet is flying at 2km height. After being shot down by a tank vertically below it, the plane crashed in the woods 2km east of the tank. Which of these is the correct displacement vector from the point of impact?

What role does the opposite parallel surfaces of a glass slab play in lateral shift of light passing through them?

How is the strength of magnetic field affected when current increases?

Which of the following has longest wavelength?

What is electric current and it's affect in our life

In the circuit diagram shown, the two resistance wires A and B are of same length and same material, but A is thicker than B. Which ammeter A1 or A2 will indicate higher reading for current? Give reason.

What will happen when we do wiring of a house with 2.5mm2 instead of 1mm2 cross section area of wire. Is extra current used or current is wasted?

Choose the activity, which does NOT fall under 'reduce' strategy?

When the direction of current through the conductor is reversed, then direction of

Two parallel wires P and Q carry currents shown by arrows. Will the wires P and Q:

Name any four fractions obtained from petroleum which are used as fuels.

The angle of incidence for a ray of light passing through the centre of curvature of a concave mirror is : (a) 45∘ (b) 90∘ (c) 0∘ (d) 180∘

____________________ is an eye defect in which distant objects appear blurred

(a) Draw the magnetic lines of force due to a circular wire carrying current. (b) What are the various ways in which the strength of the magnetic field produced by a current-carrying circular coil can be increased ?

Two ways by which the magnetic field of a solenoid can be made stronger are

A TV set consumes an electric power of 230 watts and runs on 230 volts mains supply. The correct fuse for this TV set is : (a) 5 A (b) 3 A (c) 1 A (d) 2 A

Explain the importance of using in a household electic circuit (i) fuse, and (ii) earthing wire.

Compare and contrast biomass and hydroelectricity as sources of energy.

A fielder pulls his hands gradually with the moving ball while holding a catch. Why does he do this?

What are "hot spots"?

A person is trying to push a car up hill. But he starts sliding backward along with car, work done by the person on the car is

According to the new cartesian sign convention,

The power of the lens is -2D. Is the lens concave or convex?

Why is the cutting edge of the scissor made longer than the cutting edge of a mettal

How much work is needed to be done on A ball of mass 100 g to give it a momentum of 5 kgm/s.

Why are the coils of electric irons and electric toasters amde of an alloy rather than a pure metal?

Which of the following refers to a vertical straight line?

If 'S' is the surface area of the right circular cone whose h and α are the height and semi- vertical angle, S is equal to-

What is the (a) highest (b) lowest total resistance, that can be secured by combinations of four coils of resistances 4 ohms, 8 ohms, 12 ohms and 24 ohms?

An object moves from point A to point B to point C, then back to point B and then to point C along the line shown in the figure. Find the magnitude of displacement covered by the moving object in km.

Considering a long current carrying solenoid. Among the following statements, the incorrect statement is :