16569 + Interview Questions in Physics

1.	A student while performing the experiment to find the resultant resistance of two resistors connected in series observed the ammeter pointer at position P when the key is 'off' and the same pointer at position Q when the key is 'on'.The correct reading of ammeter is:(1) 0.2 A(2) 2.5 A(3) 2.3 A(4) 2.7 A
Answer» A student while performing the experiment to find the resultant resistance of two resistors connected in series observed the ammeter pointer at position P when the key is 'off' and the same pointer at position Q when the key is 'on'. The correct reading of ammeter is: (1) 0.2 A (2) 2.5 A (3) 2.3 A (4) 2.7 A

Discussion

2.	Get into groups of four. Read the lines and put them in the right order. Read the version that you develop to the whole class. The voice of thunder declares my arrival I emerge from the heart of the Sea I descend and embrace the flowers. I am dotted silver threads dropped from heaven The rainbow announces my departure
Answer» Get into groups of four. Read the lines and put them in the right order. Read the version that you develop to the whole class. The voice of thunder declares my arrival I emerge from the heart of the Sea I descend and embrace the flowers. I am dotted silver threads dropped from heaven The rainbow announces my departure

2.

Get into groups of four. Read the lines and put them in the right order. Read the version that you develop to the whole class. The voice of thunder declares my arrival I emerge from the heart of the Sea I descend and embrace the flowers. I am dotted silver threads dropped from heaven The rainbow announces my departure

Answer»

Get
into groups of four. Read the lines and put them in the right order.
Read the version that you develop to the whole class.

The
voice of thunder declares my arrival

I
emerge from the heart of the Sea

I
descend and embrace the flowers.

I
am dotted silver threads dropped from heaven

The
rainbow announces my departure

Discussion

3.	67. Can gold be electroplated on silver?How?But silver is more reactive than gold.
Answer» 67. Can gold be electroplated on silver?How?But silver is more reactive than gold.

Discussion

4.	80.how to draw its ray diagram
Answer» 80.how to draw its ray diagram

Discussion

5.	The point at which the entire weight of a body is assumed to be concentrated is known as ___.
Answer» The point at which the entire weight of a body is assumed to be concentrated is known as ___.

Discussion

6.	A beam of light travelling in air is incident on water. Draw a ray-diagram indicating the change in its path in water.
Answer» A beam of light travelling in air is incident on water. Draw a ray-diagram indicating the change in its path in water.

Discussion

7.	Show that the mirror formula for spherical mirrors also holds for a plane mirror too.
Answer» Show that the mirror formula for spherical mirrors also holds for a plane mirror too.

Discussion

8.	Question 113(i)Sunscreens block harmful ultraviolet (UV) rays produced by the sun. Each sunscreen has a Sun Protection Factor (SPF) that tells you how many minutes you can stay in the sun before you receive one minute of burning UV rays. e.g. If you apply sunscreen with SPF 15, you get one minute of UV rays for every 15 minutes you stay in the sun.- A sunscreen with SPF 15 allows only 115 of the sun's UV rays. What percent of UV rays does the sunscreen with SPF 15 abort?
Answer» Question 113(i) Sunscreens block harmful ultraviolet (UV) rays produced by the sun. Each sunscreen has a Sun Protection Factor (SPF) that tells you how many minutes you can stay in the sun before you receive one minute of burning UV rays. e.g. If you apply sunscreen with SPF 15, you get one minute of UV rays for every 15 minutes you stay in the sun. - A sunscreen with SPF 15 allows only $\frac{1}{15}$ of the sun's UV rays. What percent of UV rays does the sunscreen with SPF 15 abort?

8.

Question 113(i)Sunscreens block harmful ultraviolet (UV) rays produced by the sun. Each sunscreen has a Sun Protection Factor (SPF) that tells you how many minutes you can stay in the sun before you receive one minute of burning UV rays. e.g. If you apply sunscreen with SPF 15, you get one minute of UV rays for every 15 minutes you stay in the sun.- A sunscreen with SPF 15 allows only 115 of the sun's UV rays. What percent of UV rays does the sunscreen with SPF 15 abort?

Answer»

Question 113(i)

Sunscreens block harmful ultraviolet (UV) rays produced by the sun. Each sunscreen has a Sun Protection Factor (SPF) that tells you how many minutes you can stay in the sun before you receive one minute of burning UV rays. e.g. If you apply sunscreen with SPF 15, you get one minute of UV rays for every 15 minutes you stay in the sun.

- A sunscreen with SPF 15 allows only $\frac{1}{15}$ of the sun's UV rays. What percent of UV rays does the sunscreen with SPF 15 abort?

Discussion

9.	Which of the following statement(s) is/are true regarding work done by a body?
Answer» Which of the following statement(s) is/are true regarding work done by a body?

Discussion

10.	Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate : (i) the total current taken from the supply, (ii) the resistance of each heater, and (iii) the energy supplied in k Wh to the three heaters in 5 hours.
Answer» Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate : (i) the total current taken from the supply, (ii) the resistance of each heater, and (iii) the energy supplied in k Wh to the three heaters in 5 hours.

10.

Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate : (i) the total current taken from the supply, (ii) the resistance of each heater, and (iii) the energy supplied in k Wh to the three heaters in 5 hours.

Answer»

Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate :

(i) the total current taken from the supply,

(ii) the resistance of each heater, and

(iii) the energy supplied in k Wh to the three heaters in 5 hours.

Discussion

11.	51. If there are two circular. Coils of different radii and carrying different currents .and their planes are inclined at an angle theta , so magnetic field at their common centre ?
Answer» 51. If there are two circular. Coils of different radii and carrying different currents .and their planes are inclined at an angle theta , so magnetic field at their common centre ?

Discussion

12.	In the below circuit, the current in each resistor is
Answer» In the below circuit, the current in each resistor is

Discussion

13.	If the refractive index of glass is 3/5 and that of water4/5 respectively find the speed of light in glass and in water
Answer» If the refractive index of glass is 3/5 and that of water4/5 respectively find the speed of light in glass and in water

Discussion

14.	the addition of three mass 1.4g, 4.24 g and 7.432g has x significant figures. value of x i
Answer» the addition of three mass 1.4g, 4.24 g and 7.432g has x significant figures. value of x i

Discussion

15.	{}_{20}Ca^{40} + X → _{21}Sc^{43} + _{1H^{1. }THEN WHAT IS THE 'X' } electron positron alpha particle proto
Answer» {}_{20}Ca^{40} + X → _{21}Sc^{43} + _{1H^{1. }THEN WHAT IS THE 'X' } electron positron alpha particle proto

Discussion

16.	An electron enters into the magnetic field and perpendicular to it, as shown in the figure. The direction of the force acting on the electrons will be?
Answer» An electron enters into the magnetic field and perpendicular to it, as shown in the figure. The direction of the force acting on the electrons will be?

16.

An electron enters into the magnetic field and perpendicular to it, as shown in the figure. The direction of the force acting on the electrons will be?

Answer»

An electron enters into the magnetic field and perpendicular to it, as shown in the figure. The direction of the force acting on the electrons will be?

Discussion

17.	The image of a tree just covers the length of a plane mirror 4 cm tall when the mirror is held 35 cm from the eye. The tree is 28 m from the mirror. What is its height?
Answer» The image of a tree just covers the length of a plane mirror $4 cm$ tall when the mirror is held $35 cm$ from the eye. The tree is $28 m$ from the mirror. What is its height?

Discussion

18.	Water in an electric kettle connected to a 220 V supply takes 5 minutes to reach its boiling point. How long will it take if the supply voltage falls to 200 V?
Answer» Water in an electric kettle connected to a 220 V supply takes 5 minutes to reach its boiling point. How long will it take if the supply voltage falls to 200 V?

Discussion

19.	Explain the use of coal and its products.
Answer» Explain the use of coal and its products.

Discussion

20.	Arrange the following fuels in the order of increasing calorific values ( keeping the fuel with lowest calorific value first) : LPG, Coal, Alcohol, Dung cakes, Diesel
Answer» Arrange the following fuels in the order of increasing calorific values ( keeping the fuel with lowest calorific value first) : LPG, Coal, Alcohol, Dung cakes, Diesel

Discussion

21.	why △ H_{f }^° of elements is zero?
Answer» why △ H_{f }^° of elements is zero?

Discussion

22.	34. Is y=asin²wt a periodic motion or a S.H.M. ?
Answer» 34. Is y=asin²wt a periodic motion or a S.H.M. ?

Discussion

23.	What is electric potential? Define electric potential difference with example.
Answer» What is electric potential? Define electric potential difference with example.

Discussion

24.	What is electromagnetic induction?
Answer» What is electromagnetic induction?

Discussion

25.	Which among the following resistor values connected to a 40 V source, will produce least heat in the circuit?
Answer» Which among the following resistor values connected to a 40 V source, will produce least heat in the circuit?

Discussion

26.	What is the relationship between focal length and radius of curvature of a lens?
Answer» What is the relationship between focal length and radius of curvature of a lens?

Discussion

27.	37.Find Length of narrow tube closed at one end resonating with a tuning fork of 500Hz (speed of sound= 340m/s)
Answer» 37.Find Length of narrow tube closed at one end resonating with a tuning fork of 500Hz (speed of sound= 340m/s)

Discussion

28.	A plotting compass in placed near the south pole of a bar magnet. The pointer of plotting compass will : (a) point away from the south pole (b) point parallel to the south pole (c) point towards the south pole (d) point at right angles to the south pole
Answer» A plotting compass in placed near the south pole of a bar magnet. The pointer of plotting compass will : (a) point away from the south pole (b) point parallel to the south pole (c) point towards the south pole (d) point at right angles to the south pole

28.

A plotting compass in placed near the south pole of a bar magnet. The pointer of plotting compass will : (a) point away from the south pole (b) point parallel to the south pole (c) point towards the south pole (d) point at right angles to the south pole

Answer»

A plotting compass in placed near the south pole of a bar magnet. The pointer of plotting compass will :

(a) point away from the south pole

(b) point parallel to the south pole

(c) point towards the south pole

(d) point at right angles to the south pole

Discussion

29.	What is the name of the disease caused in old age when eyesight becomes foggy due to the eye lens becoming cloudy?
Answer» What is the name of the disease caused in old age when eyesight becomes foggy due to the eye lens becoming cloudy?

Discussion

30.	25 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m, then the load is lifted to 3 m , the efficiency of pulley system will be:
Answer» 25 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m, then the load is lifted to 3 m , the efficiency of pulley system will be:

Discussion

31.	An electron enters in a magnetic field of intensity 5T with a velocity 2×107m/s in a direction perpendicular to the field. Calculate the force on the electron.[charge on electron is −1.6×10−19C]
Answer» An electron enters in a magnetic field of intensity 5T with a velocity $2 \times 10^{7} m / s$ in a direction perpendicular to the field. Calculate the force on the electron.[charge on electron is $- 1.6 \times 10^{- 19} C$ ]

Discussion

32.	Will current flow more easily through a thick wire or a thin wire of the same material when connected in the same source? Give reason for your answer.
Answer» Will current flow more easily through a thick wire or a thin wire of the same material when connected in the same source? Give reason for your answer.

Discussion

33.	Frequency of given AC signal is 50 Hz . when it is connected to a half wave rectifier, the number of output person given by rectifier with in one second is 1)50 2)100 3)25 4)150
Answer» Frequency of given AC signal is 50 Hz . when it is connected to a half wave rectifier, the number of output person given by rectifier with in one second is 1)50 2)100 3)25 4)150

Discussion

34.	36. A cell of negligible resistance and emf 2 volt is connected to series combination of 2, 3 and 5 ohm .The potential difference in volt between the terminals of 3 ohm resistance will be
Answer» 36. A cell of negligible resistance and emf 2 volt is connected to series combination of 2, 3 and 5 ohm .The potential difference in volt between the terminals of 3 ohm resistance will be

Discussion

35.	A battery is connected to a bulb of resistance R. If 180C of charge is passed through the bulb in 1 min and 1080J of work was done what is the value of R?
Answer» A battery is connected to a bulb of resistance R. If 180C of charge is passed through the bulb in 1 min and 1080J of work was done what is the value of R?

Discussion

36.	State the condition when a body is in (i) static, (ii) dynamic, equilibrium. Give one example each of static and dynamic equilibrium.
Answer» State the condition when a body is in (i) static, (ii) dynamic, equilibrium. Give one example each of static and dynamic equilibrium.

Discussion

37.	Two like magnetic poles : (a) repel each other (b) attract each other (c) first attract each other, then repel (d) neither attract nor repel.
Answer» Two like magnetic poles : (a) repel each other (b) attract each other (c) first attract each other, then repel (d) neither attract nor repel.

37.

Two like magnetic poles : (a) repel each other (b) attract each other (c) first attract each other, then repel (d) neither attract nor repel.

Answer»

Two like magnetic poles :

(a) repel each other

(b) attract each other

(c) first attract each other, then repel

(d) neither attract nor repel.

Discussion

38.	A concave lens of 20 cm focal length forms an image 15 cm from the lens. What is the object distance?
Answer» A concave lens of 20 cm focal length forms an image 15 cm from the lens. What is the object distance?

Discussion

39.	80.The coordination number and magnetic moment of complex (cr(c2O4)2 (NH3)2)-
Answer» 80.The coordination number and magnetic moment of complex (cr(c2O4)2 (NH3)2)-

Discussion

40.	A glass prism of refractive index 1.5 is immersed in water (μ=4/3) as shown in the figure. A light ray incident normally on face AB will get totally reflected from the face AC if
Answer» A glass prism of refractive index $1.5$ is immersed in water $(μ = 4 / 3)$ as shown in the figure. A light ray incident normally on face $A B$ will get totally reflected from the face $A C$ if

Discussion

41.	A convex lens is a ________ and a concave lens is a _________.
Answer» A convex lens is a ________ and a concave lens is a _________.

Discussion

42.	Why do the sky appears dark instead of blue to the astronauts?
Answer» Why do the sky appears dark instead of blue to the astronauts?

Discussion

43.	The magnification of an object placed in front of a convex lens of focal length 20 cm is +2. To obtain a magnification of −2, the object has to be moved by a distance equal to:
Answer» The magnification of an object placed in front of a convex lens of focal length $20 cm$ is $+ 2$ . To obtain a magnification of $- 2$ , the object has to be moved by a distance equal to:

Discussion

44.	90 g of water spilled out from a vessel in the room on the floor. Assuming that water vapour behaving as an ideal gas, calculate the internal energy change when the spilled water undergoes complete evaporation at 100 ° C (Given the molar enthalpy of vaporization of water at 1 bar and 373 K =41 kJmol¯¹)
Answer» 90 g of water spilled out from a vessel in the room on the floor. Assuming that water vapour behaving as an ideal gas, calculate the internal energy change when the spilled water undergoes complete evaporation at 100 ° C (Given the molar enthalpy of vaporization of water at 1 bar and 373 K =41 kJmol¯¹)

Discussion

45.	144. n identical cells each of EMF E and internal resistance r are connected in series. An external resistance R is connected in series to the combination. The current through R is
Answer» 144. n identical cells each of EMF E and internal resistance r are connected in series. An external resistance R is connected in series to the combination. The current through R is

Discussion

46.	Question 27 How are power and focal length of a lens related? You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light?
Answer» Question 27 How are power and focal length of a lens related? You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light?

Discussion

47.	In ray diagrams why we always place objects above the principal axis
Answer» In ray diagrams why we always place objects above the principal axis

Discussion

48.	If a spring of stiffness 'k' is cut into parts 'A and 'B' of length L(A):L(B) =2:3, then the stiffness of spring 'A' is given by
Answer» If a spring of stiffness 'k' is cut into parts 'A and 'B' of length L(A):L(B) =2:3, then the stiffness of spring 'A' is given by

Discussion

49.	The following diagram indicates the energy levels of a certain atom. When the system moves from 2E level to E, a photon of wavelength λ is emitted. The wavelength of photon emitted during its transition from 4E3 level to E level is:
Answer» The following diagram indicates the energy levels of a certain atom. When the system moves from $2 E$ level to $E$ , a photon of wavelength $λ$ is emitted. The wavelength of photon emitted during its transition from $\frac{4 E}{3}$ level to $E$ level is:

Discussion

50.	A 10 cm tall candle, when viewed using a biconvex lens, appears to be 20 cm tall. The focal length of the lens is 5 cm. What is the object distance?
Answer» A $10 c m$ tall candle, when viewed using a biconvex lens, appears to be $20 c m$ tall. The focal length of the lens is $5 c m$ . What is the object distance?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

67. Can gold be electroplated on silver?How?But silver is more reactive than gold.

80.how to draw its ray diagram

The point at which the entire weight of a body is assumed to be concentrated is known as ___.

A beam of light travelling in air is incident on water. Draw a ray-diagram indicating the change in its path in water.

Show that the mirror formula for spherical mirrors also holds for a plane mirror too.

Which of the following statement(s) is/are true regarding work done by a body?

Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate : (i) the total current taken from the supply, (ii) the resistance of each heater, and (iii) the energy supplied in k Wh to the three heaters in 5 hours.

51. If there are two circular. Coils of different radii and carrying different currents .and their planes are inclined at an angle theta , so magnetic field at their common centre ?

In the below circuit, the current in each resistor is

If the refractive index of glass is 3/5 and that of water4/5 respectively find the speed of light in glass and in water

the addition of three mass 1.4g, 4.24 g and 7.432g has x significant figures. value of x i

{}_{20}Ca^{40} + X → _{21}Sc^{43} + _{1H^{1. }THEN WHAT IS THE 'X' } electron positron alpha particle proto

An electron enters into the magnetic field and perpendicular to it, as shown in the figure. The direction of the force acting on the electrons will be?

The image of a tree just covers the length of a plane mirror 4 cm tall when the mirror is held 35 cm from the eye. The tree is 28 m from the mirror. What is its height?

Water in an electric kettle connected to a 220 V supply takes 5 minutes to reach its boiling point. How long will it take if the supply voltage falls to 200 V?

Explain the use of coal and its products.

Arrange the following fuels in the order of increasing calorific values ( keeping the fuel with lowest calorific value first) : LPG, Coal, Alcohol, Dung cakes, Diesel

why △ H_{f }^° of elements is zero?

34. Is y=asin²wt a periodic motion or a S.H.M. ?

What is electric potential? Define electric potential difference with example.

What is electromagnetic induction?

Which among the following resistor values connected to a 40 V source, will produce least heat in the circuit?

What is the relationship between focal length and radius of curvature of a lens?

37.Find Length of narrow tube closed at one end resonating with a tuning fork of 500Hz (speed of sound= 340m/s)

A plotting compass in placed near the south pole of a bar magnet. The pointer of plotting compass will : (a) point away from the south pole (b) point parallel to the south pole (c) point towards the south pole (d) point at right angles to the south pole

What is the name of the disease caused in old age when eyesight becomes foggy due to the eye lens becoming cloudy?

25 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m, then the load is lifted to 3 m , the efficiency of pulley system will be:

An electron enters in a magnetic field of intensity 5T with a velocity 2×107m/s in a direction perpendicular to the field. Calculate the force on the electron.[charge on electron is −1.6×10−19C]

Will current flow more easily through a thick wire or a thin wire of the same material when connected in the same source? Give reason for your answer.

Frequency of given AC signal is 50 Hz . when it is connected to a half wave rectifier, the number of output person given by rectifier with in one second is 1)50 2)100 3)25 4)150

36. A cell of negligible resistance and emf 2 volt is connected to series combination of 2, 3 and 5 ohm .The potential difference in volt between the terminals of 3 ohm resistance will be

A battery is connected to a bulb of resistance R. If 180C of charge is passed through the bulb in 1 min and 1080J of work was done what is the value of R?

State the condition when a body is in (i) static, (ii) dynamic, equilibrium. Give one example each of static and dynamic equilibrium.

Two like magnetic poles : (a) repel each other (b) attract each other (c) first attract each other, then repel (d) neither attract nor repel.

A concave lens of 20 cm focal length forms an image 15 cm from the lens. What is the object distance?

80.The coordination number and magnetic moment of complex (cr(c2O4)2 (NH3)2)-

A glass prism of refractive index 1.5 is immersed in water (μ=4/3) as shown in the figure. A light ray incident normally on face AB will get totally reflected from the face AC if

A convex lens is a ________ and a concave lens is a _________.

Why do the sky appears dark instead of blue to the astronauts?

The magnification of an object placed in front of a convex lens of focal length 20 cm is +2. To obtain a magnification of −2, the object has to be moved by a distance equal to:

144. n identical cells each of EMF E and internal resistance r are connected in series. An external resistance R is connected in series to the combination. The current through R is

Question 27 How are power and focal length of a lens related? You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light?

In ray diagrams why we always place objects above the principal axis

If a spring of stiffness 'k' is cut into parts 'A and 'B' of length L(A):L(B) =2:3, then the stiffness of spring 'A' is given by

The following diagram indicates the energy levels of a certain atom. When the system moves from 2E level to E, a photon of wavelength λ is emitted. The wavelength of photon emitted during its transition from 4E3 level to E level is:

A 10 cm tall candle, when viewed using a biconvex lens, appears to be 20 cm tall. The focal length of the lens is 5 cm. What is the object distance?

A convex lens is a and a concave lens is a _.