16569 + Interview Questions in Physics

1.	Question 4Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be –(a) 1:2(b) 2:1(c) 1:4(d) 4:1
Answer» Question 4 Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be – (a) 1:2 (b) 2:1 (c) 1:4 (d) 4:1

Discussion

2.	Do you think the snake was conscious of the poet's presence? How do you know?
Answer» Do you think the snake was conscious of the poet's presence? How do you know?

Discussion

3.	What is the value of electron gain enthalpy of Na+ if IE of Na=5.1 eV ?
Answer» What is the value of electron gain enthalpy of Na+ if IE of Na=5.1 eV ?

Discussion

4.	WHICH IS MORE ACCURATE FOR 6.28 CM1. 5.99 CM2. 6.00 CM3. 6.56 CM4. 6 CM
Answer» WHICH IS MORE ACCURATE FOR 6.28 CM 1. 5.99 CM 2. 6.00 CM 3. 6.56 CM 4. 6 CM

Discussion

5.	Define current. Is it a scalar quantity or a vector quantity? What is meant by the conventional direction of current?
Answer» Define current. Is it a scalar quantity or a vector quantity? What is meant by the conventional direction of current?

Discussion

6.	5.Why we say that the boiling point has reached only when the vapour pressure of the solution equalises the atmospheric pressure.
Answer» 5.Why we say that the boiling point has reached only when the vapour pressure of the solution equalises the atmospheric pressure.

Discussion

7.	A heater is designed to operate with a power of 500 W in a 100 V line. It is connected in combination with resistance R, to a 100 V main as shown in the figure given below. What should be the value of R such that heater may operate with a power of 31.25 W
Answer» A heater is designed to operate with a power of $500 W$ in a $100 V$ line. It is connected in combination with resistance $R$ , to a $100 V$ main as shown in the figure given below. What should be the value of $R$ such that heater may operate with a power of $31.25 W$

Discussion

8.	(a) What is short-sightedness ? State the two causes of short-sightedness (or myopia). With the help of ray diagrams, show : (i) the eye-defect short-sightedness. (ii) correction of short-sightedness by using a lens. (b) A person having short-sight cannot see objects clearly beyond a distance of 1.5 m. What would be the nature and power of the corrective lens to restore proper vision ?
Answer» (a) What is short-sightedness ? State the two causes of short-sightedness (or myopia). With the help of ray diagrams, show : (i) the eye-defect short-sightedness. (ii) correction of short-sightedness by using a lens. (b) A person having short-sight cannot see objects clearly beyond a distance of 1.5 m. What would be the nature and power of the corrective lens to restore proper vision ?

Discussion

9.	What is the unit of Charge
Answer» What is the unit of Charge

Discussion

10.	Question 18What does the direction of thumb indicate in the right-hand thumb rule? In what way this rule is different from Fleming’s left-hand rule?
Answer» Question 18 What does the direction of thumb indicate in the right-hand thumb rule? In what way this rule is different from Fleming’s left-hand rule?

Discussion

11.	Suppose you apply a force of 5N parallel to a wall. What will be the thrust?
Answer» Suppose you apply a force of 5N parallel to a wall. What will be the thrust?

Discussion

12.	In my house there is one tube light for each room. I am now in the kitchen. No one else is in the house. How many tubelights must be switched on in the house now if I want to conserve electricity? __
Answer» In my house there is one tube light for each room. I am now in the kitchen. No one else is in the house. How many tubelights must be switched on in the house now if I want to conserve electricity? __

Discussion

13.	It is seen that a falling apple is attracted towards the Earth. We all know that the apple will also exert an equal and opposite force on the Earth. If so, we don’t see Earth moving towards the apple, why?
Answer» It is seen that a falling apple is attracted towards the Earth. We all know that the apple will also exert an equal and opposite force on the Earth. If so, we don’t see Earth moving towards the apple, why?

Discussion

14.	State the relation between object distance, image distance and focal length of a spherical mirror (concave mirror or convex mirror).
Answer» State the relation between object distance, image distance and focal length of a spherical mirror (concave mirror or convex mirror).

Discussion

15.	In which of the following case frequency of heard sound by the observer increasesa. When source are moving away from stationary observerb. When observer are moving away from stationary sourcec. When both observer and source are moving away from each other d. When both observer and source are moving towards each other
Answer» In which of the following case frequency of heard sound by the observer increases a. When source are moving away from stationary observer b. When observer are moving away from stationary source c. When both observer and source are moving away from each other d. When both observer and source are moving towards each other

Discussion

16.	Consider the situation shown in figure. A plane mirror is fixed at a height H above the bottom of a container containing oil having refractive index μ up to a height h. Find the position of the image of the bottom formed by the mirror.
Answer» Consider the situation shown in figure. A plane mirror is fixed at a height $H$ above the bottom of a container containing oil having $refractive index μ$ up to a height $h$ . Find the position of the image of the bottom formed by the mirror.

Discussion

17.	Even if the body is not going circular motion it can have angular momentum?
Answer» Even if the body is not going circular motion it can have angular momentum?

Discussion

18.	A satellite of mass m is revolving round the earth at a height R above the surface of earth. If g is gravitational acceleration at surface of earth and R is radius of earth then magnitude of momentum of satellite is
Answer» A satellite of mass m is revolving round the earth at a height R above the surface of earth. If g is gravitational acceleration at surface of earth and R is radius of earth then magnitude of momentum of satellite is

Discussion

19.	A radioactive source in the form of a metallic sphere of radius 10−2 m emits β− particles at the rate of 5×1010 particles per second. The source is electrically insulated. How long (in μs) will it take for its potential to be raised by 2 V?Assume that 40 % of the emitted β− particles escape from the source.Round off to the nearest integer.
Answer» A radioactive source in the form of a metallic sphere of radius $10^{- 2} m$ emits $β -$ particles at the rate of $5 \times 10^{10}$ particles per second. The source is electrically insulated. How long $($ in $μ s)$ will it take for its potential to be raised by $2 V ?$ Assume that $40 %$ of the emitted $β -$ particles escape from the source. Round off to the nearest integer.

Discussion

20.	Two slits are made one millimetre apart and the screen is placed one metre away. What is the fringe separation when bluegreen light of wavelength 500 nm is used?
Answer» Two slits are made one millimetre apart and the screen is placed one metre away. What is the fringe separation when bluegreen light of wavelength $500 nm$ is used?

Discussion

21.	A transformer has 100 turns in the primary coil and carries 8 A current. If input power is 1 kW, then number of turns in the secondary coil to have 500 V output will be
Answer» A transformer has $100$ turns in the primary coil and carries $8 A$ current. If input power is $1 kW$ , then number of turns in the secondary coil to have $500 V$ output will be

Discussion

22.	3.228. Find the magnetic induction at the point O if the wire car-rying a current I- 8.0 A has the shape shown in Fig. 3.63 a, b, c.2200IRODOVThe radius of the curved part of the wire is R- 100 mm, the linearparts of the wire are very long.
Answer» 3.228. Find the magnetic induction at the point O if the wire car- rying a current I- 8.0 A has the shape shown in Fig. 3.63 a, b, c. 2 2 0 0 IRODOV The radius of the curved part of the wire is R- 100 mm, the linear parts of the wire are very long.

Discussion

23.	Two thick wiresways A,of the square is zero in case ofand two thin wires, all of the same material and same length, form a squareC as shown in the figure. With correct connections shown, the magneticin three differentreB andfield at the cent(1) A only(3) B & C only(2) A & B only44) A & C only
Answer» Two thick wiresways A,of the square is zero in case ofand two thin wires, all of the same material and same length, form a squareC as shown in the figure. With correct connections shown, the magneticin three differentreB andfield at the cent(1) A only(3) B & C only(2) A & B only44) A & C only

Discussion

24.	When the midpoints of four consecutive troughs in a sound wave are joined, it constitutes a distance of 12 cm. What is the wavelength of the sound wave?
Answer» When the midpoints of four consecutive troughs in a sound wave are joined, it constitutes a distance of $12 c m$ . What is the wavelength of the sound wave?

Discussion

25.	What is far point of a person suffering from myopia?
Answer» What is far point of a person suffering from myopia?

Discussion

26.	For three circuits, shown herethe same two resistors R1 and R2 have been connected in parallel in all the circuits but the voltmeter and the ammeter have been connected in three different positions. The relation between the three voltmeter and ammeter readings would be :(1) V1 = V2 = V3 and I1 = I2 = I3(2) V1 ≠ V2 ≠ V3 and I1 = I2 = I3(3) V1 = V2 = V3 and I1 ≠ I2 ≠ I3(4) V1 ≠ V2 ≠ V3 and I1 ≠ I2 ≠ I3
Answer» For three circuits, shown here the same two resistors R₁ and R₂ have been connected in parallel in all the circuits but the voltmeter and the ammeter have been connected in three different positions. The relation between the three voltmeter and ammeter readings would be : (1) V₁ = V₂ = V₃ and I₁ = I₂ = I₃ (2) V₁ ≠ V₂ ≠ V₃ and I₁ = I₂ = I₃ (3) V₁ = V₂ = V₃ and I₁ ≠ I₂ ≠ I₃ (4) V₁ ≠ V₂ ≠ V₃ and I₁ ≠ I₂ ≠ I₃

Discussion

27.	Question 17 A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. Calculate when and where the two stones will meet.
Answer» Question 17 A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. Calculate when and where the two stones will meet.

Discussion

28.	What do you mean by degradation of energy?Explain it by taking one example of your daily life.
Answer» What do you mean by degradation of energy?Explain it by taking one example of your daily life.

Discussion

29.	An object is situated at a distance of f/2 from a convex lens of focal length f. Distance of image will be
Answer» An object is situated at a distance of f/2 from a convex lens of focal length f. Distance of image will be

Discussion

30.	11Cundergoes β+ decay to 11B. What is the maximum energy a positron emmited in the process can possess? Atomic masses: 11C:11.0114 u; 11B:11.0093 u; e−: 0.005486. c2=931MeVu.
Answer» $^{11} C u n d e r g o e s β^{+}$ decay to $^{11} B .$ What is the maximum energy a positron emmited in the process can possess? Atomic masses: $^{11} C : 11.0114 u;^{11} B : 11.0093 u; e^{-} : 0.005486. c^{2} = 931 \frac{M e V}{u}$ .

Discussion

31.	An equilateral prism is placed on a horizontal surface. A ray PQ is incident onto it. For minimum deviation:
Answer» An equilateral prism is placed on a horizontal surface. A ray PQ is incident onto it. For minimum deviation:

Discussion

32.	A converging lens A of focal length 10 cm is separated by 4 cm from a diverging lens B of focal length 15 em. A parallel beam of light falls on A, emerges from B and is foccussd at a point I. Find the position of I
Answer» A converging lens A of focal length 10 cm is separated by 4 cm from a diverging lens B of focal length 15 em. A parallel beam of light falls on A, emerges from B and is foccussd at a point I. Find the position of I

Discussion

33.	How does the resistance of a metallic wire depend on its temperature? Explain with reason.
Answer» How does the resistance of a metallic wire depend on its temperature? Explain with reason.

Discussion

34.	Magnetic field at O
Answer» Magnetic field at O

Discussion

35.	A conductor of resistivity 100 x 108 Ohm meter is connected in the circuit. If the length of the conductor is 10 meter and area of cross section is 1 mm2(a) calculate the resistance offered by the conductor.(b) How does its resistance change if its length is halved and area of cross section is doubled.(c) What happens to its resistance if the temperature of the conductor is increased? Why?(d) If this conductor is remoulded such that its length is halved what will be its resistance?
Answer» A conductor of resistivity 100 x 108 Ohm meter is connected in the circuit. If the length of the conductor is 10 meter and area of cross section is 1 mm2 (a) calculate the resistance offered by the conductor. (b) How does its resistance change if its length is halved and area of cross section is doubled. (c) What happens to its resistance if the temperature of the conductor is increased? Why? (d) If this conductor is remoulded such that its length is halved what will be its resistance?

Discussion

36.	Two forces each of magnitude 10 N act vertically upwards and downwards respectively at the two ends A and B of a uniform rod of length 4 m which is pivoted at its midpoint O as shown in the figure. Determine the magnitude of resultant moment of forces about the pivot O. length 4 m which is pivoted at its mid point O as shown in Fig. 1.30. Determine the magnitude of resultant moment of forces about the pivot O.
Answer» Two forces each of magnitude 10 N act vertically upwards and downwards respectively at the two ends A and B of a uniform rod of length 4 m which is pivoted at its midpoint O as shown in the figure. Determine the magnitude of resultant moment of forces about the pivot O. length 4 m which is pivoted at its mid point O as shown in Fig. 1.30. Determine the magnitude of resultant moment of forces about the pivot O.

36.

Two forces each of magnitude 10 N act vertically upwards and downwards respectively at the two ends A and B of a uniform rod of length 4 m which is pivoted at its midpoint O as shown in the figure. Determine the magnitude of resultant moment of forces about the pivot O. length 4 m which is pivoted at its mid point O as shown in Fig. 1.30. Determine the magnitude of resultant moment of forces about the pivot O.

Answer»

Two forces each of magnitude 10 N act vertically upwards and downwards respectively at the two ends A and B of a uniform rod of length 4 m which is pivoted at its midpoint O as shown in the figure. Determine the magnitude of resultant moment of forces about the pivot O.

length 4 m which is pivoted at its mid point O as shown in Fig. 1.30. Determine the magnitude of resultant moment of forces about the pivot O.

Discussion

37.	A body is said to be in translational equilibrium when___.
Answer» A body is said to be in translational equilibrium when___.

Discussion

38.	Choose the incorrect statement from the following regarding magnetic lines of force:
Answer» Choose the incorrect statement from the following regarding magnetic lines of force:

Discussion

39.	what is newton's law of motion?
Answer» what is newton's law of motion?

Discussion

40.	How electric field changes with respect to circular motion of charged particle and how does polarity changes
Answer» How electric field changes with respect to circular motion of charged particle and how does polarity changes

Discussion

41.	64. For two resistor R and P, connected in parallel find the relative error in their equivalent resistance, if
Answer» 64. For two resistor R and P, connected in parallel find the relative error in their equivalent resistance, if

Discussion

42.	Answer the following questionsState two functions of MPCB for prevention of water pollution.
Answer» Answer the following questions State two functions of MPCB for prevention of water pollution.

42.

Answer the following questionsState two functions of MPCB for prevention of water pollution.

Answer»

Answer the following questions

State two functions of MPCB for prevention of water pollution.

Discussion

43.	A mass of 3kg is thrown vertically upwards with a kinetic energy of 600J. To what height will it rise? (g = 10ms–2).
Answer» A mass of 3kg is thrown vertically upwards with a kinetic energy of 600J. To what height will it rise? (g = 10ms^–2).

Discussion

44.	Two earth-satellites are revolving in the same circular orbit around the center of Earth. They must have the same ___ .
Answer» Two earth-satellites are revolving in the same circular orbit around the center of Earth. They must have the same ___ .

Discussion

45.	How does the resistance of a wire vary with its : 1). Area of cross section ? 2). Diameter ?
Answer» How does the resistance of a wire vary with its : 1). Area of cross section ? 2). Diameter ?

45.

How does the resistance of a wire vary with its : 1). Area of cross section ? 2). Diameter ?

Answer»

How does the resistance of a wire vary with its :

1). Area of cross section ?

2). Diameter ?

Discussion

46.	A calorimeter is made of a thin sheet of copper so that
Answer» A calorimeter is made of a thin sheet of copper so that

Discussion

47.	An increase in the length of a copper wire due to stretching is 25%, R1 is its resistance before stretching and R2 is its resistance after stretching, then R1 : R2 ?
Answer» An increase in the length of a copper wire due to stretching is 25%, $R_{1}$ is its resistance before stretching and $R_{2}$ is its resistance after stretching, then $R_{1} : R_{2}$ ?

Discussion

48.	A satellite gets unstable in its orbit and starts burning while falling towards Earth. If the satellite had a potential energy of 1000 joules initially and by the time it reaches the surface of the earth it attains a kinetic energy of 500 joules, then how much energy is spent in heating the satellite?
Answer» A satellite gets unstable in its orbit and starts burning while falling towards Earth. If the satellite had a potential energy of $1000 j o u l e s$ initially and by the time it reaches the surface of the earth it attains a kinetic energy of $500 j o u l e s$ , then how much energy is spent in heating the satellite?

Discussion

49.	A ray of light passes from air into a block of glass. Does it bend towards the normal or away from it ?
Answer» A ray of light passes from air into a block of glass. Does it bend towards the normal or away from it ?

Discussion

50.	A small air bubble in a glass block, when seen from above, appears to be raised because of: (a) refraction of light (b) reflection of light (c) reflection and refraction of light (d) none of the above
Answer» A small air bubble in a glass block, when seen from above, appears to be raised because of: (a) refraction of light (b) reflection of light (c) reflection and refraction of light (d) none of the above

50.

A small air bubble in a glass block, when seen from above, appears to be raised because of: (a) refraction of light (b) reflection of light (c) reflection and refraction of light (d) none of the above

Answer»

A small air bubble in a glass block, when seen from above, appears to be raised because of:

(a) refraction of light

(b) reflection of light

(c) reflection and refraction of light

(d) none of the above

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Question 4Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be –(a) 1:2(b) 2:1(c) 1:4(d) 4:1

Do you think the snake was conscious of the poet's presence? How do you know?

What is the value of electron gain enthalpy of Na+ if IE of Na=5.1 eV ?

WHICH IS MORE ACCURATE FOR 6.28 CM1. 5.99 CM2. 6.00 CM3. 6.56 CM4. 6 CM

Define current. Is it a scalar quantity or a vector quantity? What is meant by the conventional direction of current?

5.Why we say that the boiling point has reached only when the vapour pressure of the solution equalises the atmospheric pressure.

A heater is designed to operate with a power of 500 W in a 100 V line. It is connected in combination with resistance R, to a 100 V main as shown in the figure given below. What should be the value of R such that heater may operate with a power of 31.25 W

What is the unit of Charge

Question 18What does the direction of thumb indicate in the right-hand thumb rule? In what way this rule is different from Fleming’s left-hand rule?

Suppose you apply a force of 5N parallel to a wall. What will be the thrust?

In my house there is one tube light for each room. I am now in the kitchen. No one else is in the house. How many tubelights must be switched on in the house now if I want to conserve electricity? __

It is seen that a falling apple is attracted towards the Earth. We all know that the apple will also exert an equal and opposite force on the Earth. If so, we don’t see Earth moving towards the apple, why?

State the relation between object distance, image distance and focal length of a spherical mirror (concave mirror or convex mirror).

Consider the situation shown in figure. A plane mirror is fixed at a height H above the bottom of a container containing oil having refractive index μ up to a height h. Find the position of the image of the bottom formed by the mirror.

Even if the body is not going circular motion it can have angular momentum?

A satellite of mass m is revolving round the earth at a height R above the surface of earth. If g is gravitational acceleration at surface of earth and R is radius of earth then magnitude of momentum of satellite is

Two slits are made one millimetre apart and the screen is placed one metre away. What is the fringe separation when bluegreen light of wavelength 500 nm is used?

A transformer has 100 turns in the primary coil and carries 8 A current. If input power is 1 kW, then number of turns in the secondary coil to have 500 V output will be

3.228. Find the magnetic induction at the point O if the wire car-rying a current I- 8.0 A has the shape shown in Fig. 3.63 a, b, c.2200IRODOVThe radius of the curved part of the wire is R- 100 mm, the linearparts of the wire are very long.

Two thick wiresways A,of the square is zero in case ofand two thin wires, all of the same material and same length, form a squareC as shown in the figure. With correct connections shown, the magneticin three differentreB andfield at the cent(1) A only(3) B & C only(2) A & B only44) A & C only

When the midpoints of four consecutive troughs in a sound wave are joined, it constitutes a distance of 12 cm. What is the wavelength of the sound wave?

What is far point of a person suffering from myopia?

Question 17 A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. Calculate when and where the two stones will meet.

What do you mean by degradation of energy?Explain it by taking one example of your daily life.

An object is situated at a distance of f/2 from a convex lens of focal length f. Distance of image will be

11Cundergoes β+ decay to 11B. What is the maximum energy a positron emmited in the process can possess? Atomic masses: 11C:11.0114 u; 11B:11.0093 u; e−: 0.005486. c2=931MeVu.

An equilateral prism is placed on a horizontal surface. A ray PQ is incident onto it. For minimum deviation:

A converging lens A of focal length 10 cm is separated by 4 cm from a diverging lens B of focal length 15 em. A parallel beam of light falls on A, emerges from B and is foccussd at a point I. Find the position of I

How does the resistance of a metallic wire depend on its temperature? Explain with reason.

Magnetic field at O

A body is said to be in translational equilibrium when___.

Choose the incorrect statement from the following regarding magnetic lines of force:

what is newton's law of motion?

How electric field changes with respect to circular motion of charged particle and how does polarity changes

64. For two resistor R and P, connected in parallel find the relative error in their equivalent resistance, if

Answer the following questionsState two functions of MPCB for prevention of water pollution.

A mass of 3kg is thrown vertically upwards with a kinetic energy of 600J. To what height will it rise? (g = 10ms–2).

Two earth-satellites are revolving in the same circular orbit around the center of Earth. They must have the same ___ .

How does the resistance of a wire vary with its : 1). Area of cross section ? 2). Diameter ?

A calorimeter is made of a thin sheet of copper so that

An increase in the length of a copper wire due to stretching is 25%, R1 is its resistance before stretching and R2 is its resistance after stretching, then R1 : R2 ?

A ray of light passes from air into a block of glass. Does it bend towards the normal or away from it ?

A small air bubble in a glass block, when seen from above, appears to be raised because of: (a) refraction of light (b) reflection of light (c) reflection and refraction of light (d) none of the above