16569 + Interview Questions in Physics

1.	The formula that expresses the relationship between refractive index of the denser medium with respect to rarer medium and its critical angle for that pair of media is:
Answer» The formula that expresses the relationship between refractive index of the denser medium with respect to rarer medium and its critical angle for that pair of media is:

Discussion

2.	Explain why, when the sun is overhead at noon, it appears white, but when the same sun is near the horizon at sunset, it appears red.
Answer» Explain why, when the sun is overhead at noon, it appears white, but when the same sun is near the horizon at sunset, it appears red.

Discussion

3.	What kind of lens is used to correct hypermetropia?
Answer» What kind of lens is used to correct hypermetropia?

Discussion

4.	Where will be the image formed for a hypermetropic person?
Answer» Where will be the image formed for a hypermetropic person?

Discussion

5.	The ultimate source of energy stored in fossil fuels is : (a) moon (b) earth (c) sun (d) sea
Answer» The ultimate source of energy stored in fossil fuels is : (a) moon (b) earth (c) sun (d) sea

Discussion

6.	Define the term principal foci of a concave lens and show them with the help of proper diagrams.
Answer» Define the term principal foci of a concave lens and show them with the help of proper diagrams.

Discussion

7.	A person suffering from which type of disability will have a shorter far point?
Answer» A person suffering from which type of disability will have a shorter far point?

Discussion

8.	The angle between the emergent ray and incident ray when the light goes from air to glass slab is ____
Answer» The angle between the emergent ray and incident ray when the light goes from air to glass slab is ____

Discussion

9.	The near point of the far-sighted person is
Answer» The near point of the far-sighted person is

Discussion

10.	If a compass is kept exactly between the north poles of a two similar bar magnets, in which direction will the needle get deflected?
Answer» If a compass is kept exactly between the north poles of a two similar bar magnets, in which direction will the needle get deflected?

10.

If a compass is kept exactly between the north poles of a two similar bar magnets, in which direction will the needle get deflected?

Answer»

If a compass is kept exactly between the north poles of a two similar bar magnets, in which direction will the needle get deflected?

Discussion

11.	Now Tony settles upon a Carnot engine. Calculate the efficiency of the Carnot engine if the temperature it operates between are 350 K and 250 K.
Answer» Now Tony settles upon a Carnot engine. Calculate the efficiency of the Carnot engine if the temperature it operates between are 350 K and 250 K.

11.

Now Tony settles upon a Carnot engine. Calculate the efficiency of the Carnot engine if the temperature it operates between are 350 K and 250 K.

Answer»

Now Tony settles upon a Carnot engine. Calculate the efficiency of the Carnot engine if the temperature it operates between are 350 K and 250 K.

Discussion

12.	Show how would you join three resistors, each of resistance 9 Ω so that the equivalent resistance of the combination is (a) 13.5 Ω (b) 6 Ω ? OR (a) Write Joule's law of heating. (b) Two lamps, one rated 100 W; 220 V, and the other 60 W; 220 V, are connected in parallel to electric mains supply. Find the current drawn by two bulbs from the line, if the supply voltage is 220 V.
Answer» Show how would you join three resistors, each of resistance 9 $Ω$ so that the equivalent resistance of the combination is (a) 13.5 $Ω$ (b) 6 $Ω$ ? OR (a) Write Joule's law of heating. (b) Two lamps, one rated 100 W; 220 V, and the other 60 W; 220 V, are connected in parallel to electric mains supply. Find the current drawn by two bulbs from the line, if the supply voltage is 220 V.

Discussion

13.	You have three resistors of 'r' ohm each and a battery of 'E' volts. How would you connect these resistors with the battery to obtain maximum current ? Draw a circuit diagram to illustrate your answer and also calculate the current drawn from the battery.
Answer» You have three resistors of 'r' ohm each and a battery of 'E' volts. How would you connect these resistors with the battery to obtain maximum current ? Draw a circuit diagram to illustrate your answer and also calculate the current drawn from the battery.

Discussion

14.	The direction of current is opposite to the direction of flow of electrons. So does this mean current is a vector quantity? Why/why not?
Answer» The direction of current is opposite to the direction of flow of electrons. So does this mean current is a vector quantity? Why/why not?

Discussion

15.	What is earth wire ? How it works in our domestic circuit ?
Answer» What is earth wire ? How it works in our domestic circuit ?

Discussion

16.	A metal wire of specific resistance 64×10^-6 ohm metre and length 1.98 cm has resistance of 7 ohm find its radius
Answer» A metal wire of specific resistance 64×10^-6 ohm metre and length 1.98 cm has resistance of 7 ohm find its radius

Discussion

17.	What is the difference between polyatomic ion and a radical
Answer» What is the difference between polyatomic ion and a radical

Discussion

18.	A person with defective eyesight is unable to see objects clearly nearer than 1.5 m. He wants to read a book placed at a distance of 30 cm from his eyes. The type of a required lens and its focal length is
Answer» A person with defective eyesight is unable to see objects clearly nearer than 1.5 m. He wants to read a book placed at a distance of 30 cm from his eyes. The type of a required lens and its focal length is

Discussion

19.	State the form of magnetic field lines around a straight current-carrying conductor.
Answer» State the form of magnetic field lines around a straight current-carrying conductor.

Discussion

20.	Two wires A and B of the same material have their lengths in the ratio 1:2 and radii in the ratio 3:1. The two wires are connected in parallel across a battery. The ratio of heat produced in A to the heat produced in B for the same time is-
Answer» Two wires A and B of the same material have their lengths in the ratio 1:2 and radii in the ratio 3:1. The two wires are connected in parallel across a battery. The ratio of heat produced in A to the heat produced in B for the same time is-

Discussion

21.	A vacuum cleaner draws a current fo 2 A from the mains supply. (a) What is the appropriate value of the fuse to be fitted in its circuit ? (b) What will happen if a 13 A fuse is fitted in its circuit ?
Answer» A vacuum cleaner draws a current fo 2 A from the mains supply. (a) What is the appropriate value of the fuse to be fitted in its circuit ? (b) What will happen if a 13 A fuse is fitted in its circuit ?

21.

A vacuum cleaner draws a current fo 2 A from the mains supply. (a) What is the appropriate value of the fuse to be fitted in its circuit ? (b) What will happen if a 13 A fuse is fitted in its circuit ?

Answer»

A vacuum cleaner draws a current fo 2 A from the mains supply.

(a) What is the appropriate value of the fuse to be fitted in its circuit ?

(b) What will happen if a 13 A fuse is fitted in its circuit ?

Discussion

22.	A hollow cylindrical shell of radii a and b is filled with a material of resistivity ρ. Find the current through ammeter.
Answer» A hollow cylindrical shell of radii a and b is filled with a material of resistivity $ρ$ . Find the current through ammeter.

Discussion

23.	What physical quantity does the electron volt (eV) measure? How is it related to the S.I. unit of that quantity ?
Answer» What physical quantity does the electron volt (eV) measure? How is it related to the S.I. unit of that quantity ?

Discussion

24.	The speed of light in air is 3 ×108ms−1. Calculate the speed of light in glass. The refractive index of glass is 1.5.
Answer» The speed of light in air is 3 $\times 10^{8} m s^{- 1}$ . Calculate the speed of light in glass. The refractive index of glass is 1.5.

Discussion

25.	Suppose a diatomic gas gets ionised to a certain extent without any expenditure of heat energy. If the fractional change in the number of moles of the gas be η, then ignoring any internal energy loss, the fractional change in the temperature of the gas will be ηη+x. Then x is
Answer» Suppose a diatomic gas gets ionised to a certain extent without any expenditure of heat energy. If the fractional change in the number of moles of the gas be $η$ , then ignoring any internal energy loss, the fractional change in the temperature of the gas will be $\frac{η}{η + x}$ . Then $x$ is

Discussion

26.	In a circuit, an electrical device is connected across the battery along with a fuse placed before the device. What possible amount can pass through the fuse if the rating for fuse device is given as 4.5A ?
Answer» In a circuit, an electrical device is connected across the battery along with a fuse placed before the device. What possible amount can pass through the fuse if the rating for fuse device is given as 4.5A ?

Discussion

27.	(a) What is spectrum ? What is the name of glass shape used to produce a spectrum ? (b) How many colours are there in a full spectrum of white light ? Write the various colours of spectrum in the order. starting with red.
Answer» (a) What is spectrum ? What is the name of glass shape used to produce a spectrum ? (b) How many colours are there in a full spectrum of white light ? Write the various colours of spectrum in the order. starting with red.

Discussion

28.	A book kept on the table is an example of :
Answer» A book kept on the table is an example of :

Discussion

29.	An electrical appliance rated 1000 W, 250 V is connected to mains of voltage 250 V. Calculate the cost of the energy consumed in 20 hours, given that the unit cost is Rs 4 per kWh.
Answer» An electrical appliance rated $1000 W, 250 V$ is connected to mains of voltage $250 V$ . Calculate the cost of the energy consumed in 20 hours, given that the unit cost is Rs 4 per kWh.

Discussion

30.	A bulb of power 40 W is used for 12.5 hrs each day for 30 days. Calculate the electrical energy consumed.
Answer» A bulb of power 40 W is used for 12.5 hrs each day for 30 days. Calculate the electrical energy consumed.

Discussion

31.	The magnification formula is?
Answer» The magnification formula is?

Discussion

32.	A person completes half of his journey with speed v1 and rest half with speed v2. The average speed (vavg) of the person is
Answer» A person completes half of his journey with speed $v_{1}$ and rest half with speed $v_{2}$ . The average speed ( $v_{a v g})$ of the person is

Discussion

33.	Two resistors of 2.0Ω and 3.0Ω are connected (a) in series, (b) in parallel, with a battery of 6.0 V and negligible internal resistance. For each case, draw a circuit diagram and calculate the current through the battery.
Answer» Two resistors of $2.0 Ω$ and $3.0 Ω$ are connected (a) in series, (b) in parallel, with a battery of 6.0 V and negligible internal resistance. For each case, draw a circuit diagram and calculate the current through the battery.

Discussion

34.	Draw diagrams to illustrate the positions of fulcrum, load and effort, in each of the following : (a) A seesaw (b) A common balance (c) A nut cracker (d) Forceps.
Answer» Draw diagrams to illustrate the positions of fulcrum, load and effort, in each of the following : (a) A seesaw (b) A common balance (c) A nut cracker (d) Forceps.

34.

Draw diagrams to illustrate the positions of fulcrum, load and effort, in each of the following : (a) A seesaw (b) A common balance (c) A nut cracker (d) Forceps.

Answer»

Draw diagrams to illustrate the positions of fulcrum, load and effort, in each of the following :

(a) A seesaw (b) A common balance

(c) A nut cracker (d) Forceps.

Discussion

35.	In which of the following national park, the practice of grazing by local shepherds was discontinued?
Answer» In which of the following national park, the practice of grazing by local shepherds was discontinued?

Discussion

36.	Near and Far points of a healthy human eye are:
Answer» Near and Far points of a healthy human eye are:

Discussion

37.	In the figure QR is a vertical conductor and the current I flows from R to Q. P is a point on the horizontal plane and is to the south of the wire. The direction of the magnetic field at P due to the current will be towards:
Answer» In the figure QR is a vertical conductor and the current I flows from R to Q. P is a point on the horizontal plane and is to the south of the wire. The direction of the magnetic field at P due to the current will be towards:

37.

In the figure QR is a vertical conductor and the current I flows from R to Q. P is a point on the horizontal plane and is to the south of the wire. The direction of the magnetic field at P due to the current will be towards:

Answer»

In the figure QR is a vertical conductor and the current I flows from R to Q. P is a point on the horizontal
plane and is to the south of the wire. The direction of the magnetic field at P due to the current will be towards:

Discussion

38.	In Fleming's left-hand rule, the thumb indicates the direction of ___.
Answer» In Fleming's left-hand rule, the thumb indicates the direction of ___.

Discussion

39.	Which of the following colour scatters the least?
Answer» Which of the following colour scatters the least?

Discussion

40.	The velocity of a particle depends upon as v = a + bt + ct2 ; if the velocity is in m/sec, the unit of a will be
Answer» The velocity of a particle depends upon as v = a + bt + $c t^{2}$ ; if the velocity is in m/sec, the unit of a will be

Discussion

41.	A bar magnet is brought closer to another bar magnet. It is observed that they repel each other. What are the poles of part 1 and part 2?
Answer» A bar magnet is brought closer to another bar magnet. It is observed that they repel each other. What are the poles of part 1 and part 2?

41.

A bar magnet is brought closer to another bar magnet. It is observed that they repel each other. What are the poles of part 1 and part 2?

Answer»

A bar magnet is brought closer to another bar magnet. It is observed that they repel each other. What are the poles of part 1 and part 2?

Discussion

42.	Power is defined as:
Answer» Power is defined as:

Discussion

43.	Question 10 Rays from sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object? (a) 15 cm in front of the mirror (b) 30 cm in front of the mirror (c) between 15 cm and 30 cm in front of the mirror (d) more than 30 cm in front of the mirror
Answer» Question 10 Rays from sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object? (a) 15 cm in front of the mirror (b) 30 cm in front of the mirror (c) between 15 cm and 30 cm in front of the mirror (d) more than 30 cm in front of the mirror

Discussion

44.	Is Electrical Energy the same as Electric Current?
Answer» Is Electrical Energy the same as Electric Current?

Discussion

45.	Why is ammeter connected in series and volt meter in parallel circuit?
Answer» Why is ammeter connected in series and volt meter in parallel circuit?

Discussion

46.	What happens to the resistance when the conductor is made thicker?
Answer» What happens to the resistance when the conductor is made thicker?

Discussion

47.	In household circuits, is a fuse wire connected in series or in parallel ?
Answer» In household circuits, is a fuse wire connected in series or in parallel ?

Discussion

48.	What will happen if the copper wire used in the solenoid is not insulated?
Answer» What will happen if the copper wire used in the solenoid is not insulated?

Discussion

49.	A bike is going on a concave downward bridge with a constant velocity v. find the direction of normal(N) and centripetal force when the body reaches middle of the bridge?
Answer» A bike is going on a concave downward bridge with a constant velocity v. find the direction of normal(N) and centripetal force when the body reaches middle of the bridge?

49.

A bike is going on a concave downward bridge with a constant velocity v. find the direction of normal(N) and centripetal force when the body reaches middle of the bridge?

Answer»

A bike is going on a concave downward bridge with a constant velocity v. find the direction of normal(N) and centripetal force when the body reaches middle of the bridge?

Discussion

50.	Current in a circuit flows : (a) in the direction from high potential to low potential (b) in the direction from low potential to high potential (c) in direction of flow of electrons (d) in any direction.
Answer» Current in a circuit flows : (a) in the direction from high potential to low potential (b) in the direction from low potential to high potential (c) in direction of flow of electrons (d) in any direction.

50.

Current in a circuit flows : (a) in the direction from high potential to low potential (b) in the direction from low potential to high potential (c) in direction of flow of electrons (d) in any direction.

Answer»

Current in a circuit flows :

(a) in the direction from high potential to low potential

(b) in the direction from low potential to high potential

(c) in direction of flow of electrons

(d) in any direction.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The formula that expresses the relationship between refractive index of the denser medium with respect to rarer medium and its critical angle for that pair of media is:

Explain why, when the sun is overhead at noon, it appears white, but when the same sun is near the horizon at sunset, it appears red.

What kind of lens is used to correct hypermetropia?

Where will be the image formed for a hypermetropic person?

The ultimate source of energy stored in fossil fuels is : (a) moon (b) earth (c) sun (d) sea

Define the term principal foci of a concave lens and show them with the help of proper diagrams.

A person suffering from which type of disability will have a shorter far point?

The angle between the emergent ray and incident ray when the light goes from air to glass slab is ____

The near point of the far-sighted person is

If a compass is kept exactly between the north poles of a two similar bar magnets, in which direction will the needle get deflected?

Now Tony settles upon a Carnot engine. Calculate the efficiency of the Carnot engine if the temperature it operates between are 350 K and 250 K.

You have three resistors of 'r' ohm each and a battery of 'E' volts. How would you connect these resistors with the battery to obtain maximum current ? Draw a circuit diagram to illustrate your answer and also calculate the current drawn from the battery.

The direction of current is opposite to the direction of flow of electrons. So does this mean current is a vector quantity? Why/why not?

What is earth wire ? How it works in our domestic circuit ?

A metal wire of specific resistance 64×10^-6 ohm metre and length 1.98 cm has resistance of 7 ohm find its radius

What is the difference between polyatomic ion and a radical

A person with defective eyesight is unable to see objects clearly nearer than 1.5 m. He wants to read a book placed at a distance of 30 cm from his eyes. The type of a required lens and its focal length is

State the form of magnetic field lines around a straight current-carrying conductor.

Two wires A and B of the same material have their lengths in the ratio 1:2 and radii in the ratio 3:1. The two wires are connected in parallel across a battery. The ratio of heat produced in A to the heat produced in B for the same time is-

A vacuum cleaner draws a current fo 2 A from the mains supply. (a) What is the appropriate value of the fuse to be fitted in its circuit ? (b) What will happen if a 13 A fuse is fitted in its circuit ?

A hollow cylindrical shell of radii a and b is filled with a material of resistivity ρ. Find the current through ammeter.

What physical quantity does the electron volt (eV) measure? How is it related to the S.I. unit of that quantity ?

The speed of light in air is 3 ×108ms−1. Calculate the speed of light in glass. The refractive index of glass is 1.5.

Suppose a diatomic gas gets ionised to a certain extent without any expenditure of heat energy. If the fractional change in the number of moles of the gas be η, then ignoring any internal energy loss, the fractional change in the temperature of the gas will be ηη+x. Then x is

In a circuit, an electrical device is connected across the battery along with a fuse placed before the device. What possible amount can pass through the fuse if the rating for fuse device is given as 4.5A ?

(a) What is spectrum ? What is the name of glass shape used to produce a spectrum ? (b) How many colours are there in a full spectrum of white light ? Write the various colours of spectrum in the order. starting with red.

A book kept on the table is an example of :

An electrical appliance rated 1000 W, 250 V is connected to mains of voltage 250 V. Calculate the cost of the energy consumed in 20 hours, given that the unit cost is Rs 4 per kWh.

A bulb of power 40 W is used for 12.5 hrs each day for 30 days. Calculate the electrical energy consumed.

The magnification formula is?

A person completes half of his journey with speed v1 and rest half with speed v2. The average speed (vavg) of the person is

Two resistors of 2.0Ω and 3.0Ω are connected (a) in series, (b) in parallel, with a battery of 6.0 V and negligible internal resistance. For each case, draw a circuit diagram and calculate the current through the battery.

Draw diagrams to illustrate the positions of fulcrum, load and effort, in each of the following : (a) A seesaw (b) A common balance (c) A nut cracker (d) Forceps.

In which of the following national park, the practice of grazing by local shepherds was discontinued?

Near and Far points of a healthy human eye are:

In the figure QR is a vertical conductor and the current I flows from R to Q. P is a point on the horizontal plane and is to the south of the wire. The direction of the magnetic field at P due to the current will be towards:

In Fleming's left-hand rule, the thumb indicates the direction of ___.

Which of the following colour scatters the least?

The velocity of a particle depends upon as v = a + bt + ct2 ; if the velocity is in m/sec, the unit of a will be

A bar magnet is brought closer to another bar magnet. It is observed that they repel each other. What are the poles of part 1 and part 2?

Power is defined as:

Is Electrical Energy the same as Electric Current?

Why is ammeter connected in series and volt meter in parallel circuit?

What happens to the resistance when the conductor is made thicker?

In household circuits, is a fuse wire connected in series or in parallel ?

What will happen if the copper wire used in the solenoid is not insulated?

A bike is going on a concave downward bridge with a constant velocity v. find the direction of normal(N) and centripetal force when the body reaches middle of the bridge?

Current in a circuit flows : (a) in the direction from high potential to low potential (b) in the direction from low potential to high potential (c) in direction of flow of electrons (d) in any direction.