16569 + Interview Questions in Physics

1.	A body travels 12 cm in the first two seconds and 24 cm in the next four seconds. What is the average speed of the body for the entire journey?
Answer» A body travels 12 cm in the first two seconds and 24 cm in the next four seconds. What is the average speed of the body for the entire journey?

Discussion

2.	A particle of charge q and mass m moving with velocity v along the x - axis enters the region x>0 with uniform magnetic field B along positive z direction. The particle will penetrate in this region along x - axis up to a distance d equal to
Answer» A particle of charge q and mass m moving with velocity v along the x - axis enters the region x>0 with uniform magnetic field B along positive z direction. The particle will penetrate in this region along x - axis up to a distance d equal to

Discussion

3.	Convex lens of focal length 15 cm is kept in series with a concave lens of focal length 30 cm. Find the power of the combination of lenses?
Answer» Convex lens of focal length 15 cm is kept in series with a concave lens of focal length 30 cm. Find the power of the combination of lenses?

Discussion

4.	A total reflecting equilateral prism can be used to deviate a ray of light through: (a) 30∘ (b) 60∘ (c) 75∘ (d) 90∘
Answer» A total reflecting equilateral prism can be used to deviate a ray of light through: (a) $30^{\circ}$ (b) $60^{\circ}$ (c) $75^{\circ}$ (d) $90^{\circ}$

4.

A total reflecting equilateral prism can be used to deviate a ray of light through: (a) 30∘ (b) 60∘ (c) 75∘ (d) 90∘

Answer»

A total reflecting equilateral prism can be used to deviate a ray of light through:

(a) $30^{\circ}$ (b) $60^{\circ}$ (c) $75^{\circ}$ (d) $90^{\circ}$

Discussion

5.	A charge of 2×10−2 C moves at 30 revolutions per second in a circle of diameter 80 cm. Find the current linked with the circuit.
Answer» A charge of $2 \times 10^{- 2}$ C moves at 30 revolutions per second in a circle of diameter 80 cm. Find the current linked with the circuit.

Discussion

6.	Question 22 Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2 Ω in series with a combination of two resistors (4 Ω each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2 Ω resistors be the same as that across the parallel combination of 4Ω resistors? Give reason.
Answer» Question 22 Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2 $Ω$ in series with a combination of two resistors (4 $Ω$ each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2 $Ω$ resistors be the same as that across the parallel combination of 4 $Ω$ resistors? Give reason.

Discussion

7.	An object moves with a uniform velocity when the net force acting on it is___ .
Answer» An object moves with a uniform velocity when the net force acting on it is___ .

Discussion

8.	What is the position of G with respect to E?
Answer» What is the position of G with respect to E?

Discussion

9.	What is the difference between intramolecular force and intermolecular force?
Answer» What is the difference between intramolecular force and intermolecular force?

Discussion

10.	Alena of focal length 5 cm is being used by a student in the laboratory as a magnifying glass. His least distansd of distinct vision is 25cm. What magnification Is the student getting.
Answer» Alena of focal length 5 cm is being used by a student in the laboratory as a magnifying glass. His least distansd of distinct vision is 25cm. What magnification Is the student getting.

Discussion

11.	As i know that difference in pressure is potential difference. Then here what is the meaning of pressure difference?
Answer» As i know that difference in pressure is potential difference. Then here what is the meaning of pressure difference?

Discussion

12.	The heat produced by passing an electric current through a fixed resistor is proportional to the square of : (a) magnitude of resistance of the resistor (b) temperature of the resistor (c) magnitude of current (d) time for which current is passed
Answer» The heat produced by passing an electric current through a fixed resistor is proportional to the square of : (a) magnitude of resistance of the resistor (b) temperature of the resistor (c) magnitude of current (d) time for which current is passed

Discussion

13.	State the principle of an electric generator. [2 MARKS]
Answer» State the principle of an electric generator. [2 MARKS]

Discussion

14.	Which of the following things released due to mining causes major environmental degradation?
Answer» Which of the following things released due to mining causes major environmental degradation?

Discussion

15.	A ray of light incident at an angle of incidence i1 passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges at an angle of emergencei2. (i) How is the angle of emergence 'i2' related to the angle of incidence 'i1'? (ii) What can you say about the angle of deviation in such a situation?
Answer» A ray of light incident at an angle of incidence $i_{1}$ passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges at an angle of emergence $i_{2}$ . (i) How is the angle of emergence ' $i_{2}$ ' related to the angle of incidence ' $i_{1}$ '? (ii) What can you say about the angle of deviation in such a situation?

Discussion

16.	The output current of a transformer in which the voltage is stepped down is usually higher than the input current. Explain why?
Answer» The output current of a transformer in which the voltage is stepped down is usually higher than the input current. Explain why?

Discussion

17.	State the direction of the incident ray which after reflection from a spherical mirror retraces its path. Give a reason for your answer.
Answer» State the direction of the incident ray which after reflection from a spherical mirror retraces its path. Give a reason for your answer.

Discussion

18.	When sunlight enters the earth's atmosphere, state which colour of light is scattered (i) the most, and (ii) the least.
Answer» When sunlight enters the earth's atmosphere, state which colour of light is scattered (i) the most, and (ii) the least.

Discussion

19.	Which of the following represents the current-time graph of a generator with a slip ring?
Answer» Which of the following represents the current-time graph of a generator with a slip ring?

Discussion

20.	In how much time (in seconds) should a charge of 10 C flow between the two terminals so as to maintain a constant current of 100 A?
Answer» In how much time (in seconds) should a charge of $10 C$ flow between the two terminals so as to maintain a constant current of $100 A$ ?

Discussion

21.	The generator works on the concept of ___.
Answer» The generator works on the concept of ___.

Discussion

22.	Which of the following processes is the final step in production of electricity?
Answer» Which of the following processes is the final step in production of electricity?

Discussion

23.	Two similar resistors R are connected in series and than in parallel. Find the ratio of their effective resistance in series to parallel.
Answer» Two similar resistors R are connected in series and than in parallel. Find the ratio of their effective resistance in series to parallel.

Discussion

24.	A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24W resistance, which may be used separately in series or in parallel. What are the currents in the three cases?
Answer» A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24W resistance, which may be used separately in series or in parallel. What are the currents in the three cases?

Discussion

25.	When resistors R1 and R2 are connected in series across a battery of potential difference V, the power dissipated by the resistors are P1 and P2 respectively. When they are connected in parallel across a battery of potential difference E, the power dissipated is P3 and P4 respectively. Which one of the following is true?
Answer» When resistors $R_{1}$ and $R_{2}$ are connected in series across a battery of potential difference $V,$ the power dissipated by the resistors are $P_{1}$ and $P_{2}$ respectively. When they are connected in parallel across a battery of potential difference $E,$ the power dissipated is $P_{3}$ and $P_{4}$ respectively. Which one of the following is true?

Discussion

26.	All the formulas from electricity chapter
Answer» All the formulas from electricity chapter

Discussion

27.	Why does Sun appear slightly oval shaped at morning and evening?
Answer» Why does Sun appear slightly oval shaped at morning and evening?

Discussion

28.	Select the molecule from the following which has polar bond but dipole moment is zero.
Answer» Select the molecule from the following which has polar bond but dipole moment is zero.

Discussion

29.	Which of the following is not included in three R's approach?
Answer» Which of the following is not included in three R's approach?

Discussion

30.	If the charge of an electron is 1.6*10-19 coulombs, how many electrons should pass through a conductor in 1 second to constitute 1 ampere current?
Answer» If the charge of an electron is 1.6*10^-19 coulombs, how many electrons should pass through a conductor in 1 second to constitute 1 ampere current?

Discussion

31.	Short circuit occurs
Answer» Short circuit occurs

Discussion

32.	In how many seconds should a charge of 10 C flow between two terminals so as to maintain a constant current of 100 A?
Answer» In how many seconds should a charge of 10 C flow between two terminals so as to maintain a constant current of 100 A?

Discussion

33.	A tuning fork and a sonometer wire were sounded together and produce 4 beats per second. When the length of sonometer wire is 95 cm or 100 cm, the frequency of the tuning fork is
Answer» A tuning fork and a sonometer wire were sounded together and produce 4 beats per second. When the length of sonometer wire is 95 cm or 100 cm, the frequency of the tuning fork is

Discussion

34.	Question 15 (b) State the rule to determine the direction of a (ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.
Answer» Question 15 (b) State the rule to determine the direction of a (ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.

Discussion

35.	A large coal-fired power station produces 2000 MW of electrical energy. A wind turbine with 33 m blades can produce 300 kw. (a) How many turbines would be needed to replace the power station? (b) Why, in actual practice, this number of turbines could not replace the coal-fired power station ?
Answer» A large coal-fired power station produces 2000 MW of electrical energy. A wind turbine with 33 m blades can produce 300 kw. (a) How many turbines would be needed to replace the power station? (b) Why, in actual practice, this number of turbines could not replace the coal-fired power station ?

Discussion

36.	The calorific values of five fuels A, B, C, D and E are given below: A 48 kJ/g B 17 kJ/g C 150 kJ/g D 50kJ/g E 30kJ/g Which of the fuels could be: (i) cooking gas (ii) alcohol (iii) wood (iv) hydrogen (v) kerosene?
Answer» The calorific values of five fuels A, B, C, D and E are given below: A 48 kJ/g B 17 kJ/g C 150 kJ/g D 50kJ/g E 30kJ/g Which of the fuels could be: (i) cooking gas (ii) alcohol (iii) wood (iv) hydrogen (v) kerosene?

Discussion

37.	State one condition for a body to execute the natural vibrations.
Answer» State one condition for a body to execute the natural vibrations.

Discussion

38.	Different stages of power production and transmission are given. Arrange them in the proper sequence. a) Distribution transformer reduces the voltage from 11 kV to 220 V. b) Voltage is reduced from 220 kV to 66 kV supply electricity to large-scale industries. c) Turbine is rotated to operate the generator. d) Transmission of electricity at the power stations starts at 220 kV. e) Electricity is produced at 11 kV. f) Domestic consumers get electricity.
Answer» Different stages of power production and transmission are given. Arrange them in the proper sequence. a) Distribution transformer reduces the voltage from 11 kV to 220 V. b) Voltage is reduced from 220 kV to 66 kV supply electricity to large-scale industries. c) Turbine is rotated to operate the generator. d) Transmission of electricity at the power stations starts at 220 kV. e) Electricity is produced at 11 kV. f) Domestic consumers get electricity.

38.

Different stages of power production and transmission are given. Arrange them in the proper sequence. a) Distribution transformer reduces the voltage from 11 kV to 220 V. b) Voltage is reduced from 220 kV to 66 kV supply electricity to large-scale industries. c) Turbine is rotated to operate the generator. d) Transmission of electricity at the power stations starts at 220 kV. e) Electricity is produced at 11 kV. f) Domestic consumers get electricity.

Answer»

Different stages of power production and transmission are given. Arrange them in the proper sequence.

a) Distribution transformer reduces the voltage from 11 kV to 220 V.
b) Voltage is reduced from 220 kV to 66 kV supply electricity to large-scale industries.
c) Turbine is rotated to operate the generator.
d) Transmission of electricity at the power stations starts at 220 kV.
e) Electricity is produced at 11 kV.
f) Domestic consumers get electricity.

Discussion

39.	Which mirror is used as a street light reflector?
Answer» Which mirror is used as a street light reflector?

Discussion

40.	50 g of copper is heated to increase its temperature by 10∘C. If the same quantity of heat is given to 10 g of water, the rise in its temperature is: (Given: Specific heat of copper = 420 Joule kg−1∘C−1, Specific heat of water = 4200 Joule kg−1∘C−1)
Answer» $50 g$ of copper is heated to increase its temperature by $10^{\circ} C .$ If the same quantity of heat is given to $10 g$ of water, the rise in its temperature is: (Given: ${Specific heat of copper = 420 Joule kg}^{- 1}^{\circ} C^{- 1}$ , ${Specific heat of water = 4200 Joule kg}^{- 1}^{\circ} C^{- 1}$ )

40.

50 g of copper is heated to increase its temperature by 10∘C. If the same quantity of heat is given to 10 g of water, the rise in its temperature is: (Given: Specific heat of copper = 420 Joule kg−1∘C−1, Specific heat of water = 4200 Joule kg−1∘C−1)

Answer»

$50 g$ of copper is heated to increase its temperature by $10^{\circ} C .$ If the same quantity of heat is given to $10 g$ of water, the rise in its temperature is:

(Given: ${Specific heat of copper = 420 Joule kg}^{- 1}^{\circ} C^{- 1}$ , ${Specific heat of water = 4200 Joule kg}^{- 1}^{\circ} C^{- 1}$ )

Discussion

41.	A uniform steel wire of cross-sectional area 0.20 mm2 is held fixed by clamping its two ends. Find the extra force exerted by each clamp on the wire if the wire is cooled from 100∘C to 0∘C. Young's modulus of steel = 2.0 × 1011 N/m2. Coefficient of linear expansion of steel = 1.2 × 10−5/∘C.
Answer» A uniform steel wire of cross-sectional area $0.20 m m^{2}$ is held fixed by clamping its two ends. Find the extra force exerted by each clamp on the wire if the wire is cooled from $100^{\circ} C$ to $0^{\circ} C$ . Young's modulus of steel = $2.0 \times 10^{11} N / m^{2}$ . Coefficient of linear expansion of steel = $1.2 \times 10^{- 5} /^{\circ} C$ .

Discussion

42.	Which of the following do not conduct electricity in their aqueous solution?
Answer» Which of the following do not conduct electricity in their aqueous solution?

Discussion

43.	The earth revolves about the sun in an elliptical orbit with mean radius 9.3×107m in a period of 1 year. Assuming that there are no outside influences
Answer» The earth revolves about the sun in an elliptical orbit with mean radius $9.3 \times 10^{7} m$ in a period of 1 year. Assuming that there are no outside influences

Discussion

44.	what is the meaning of "potential" in physics?
Answer» what is the meaning of "potential" in physics?

Discussion

45.	Which of these sets lists the major greenhouse gases?
Answer» Which of these sets lists the major greenhouse gases?

Discussion

46.	Two infinitely long current carrying conductors are in X-Y plane parallel to y-axis at x = - a and x = + a as shown in the figure. The currents in A and B vary with time as iA=αt and iB=αt. Taking the direction of magnetic field into account select the correct variation of B at origin 'O' with time 't'.(α is a +ve constant)
Answer» Two infinitely long current carrying conductors are in X-Y plane parallel to y-axis at x = - a and x = + a as shown in the figure. The currents in A and B vary with time as $i_{A} = α t$ and $i_{B} = \frac{α}{t}$ . Taking the direction of magnetic field into account select the correct variation of B at origin 'O' with time 't'.( $α$ is a +ve constant)

Discussion

47.	What should be the rating of an electric fuse for a micro oven, which is operating on a current rating of 5A?
Answer» What should be the rating of an electric fuse for a micro oven, which is operating on a current rating of 5A?

Discussion

48.	Give some examples of primary cells.
Answer» Give some examples of primary cells.

Discussion

49.	Ocean-thermal-energy conversion plants can operate if the temperature difference between the water at the surface and water at depths up to 2 kilometers are _____________ K or more.
Answer» Ocean-thermal-energy conversion plants can operate if the temperature difference between the water at the surface and water at depths up to 2 kilometers are _____________ K or more.

Discussion

50.	The unit of electrical power is:
Answer» The unit of electrical power is:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A body travels 12 cm in the first two seconds and 24 cm in the next four seconds. What is the average speed of the body for the entire journey?

A particle of charge q and mass m moving with velocity v along the x - axis enters the region x&gt;0 with uniform magnetic field B along positive z direction. The particle will penetrate in this region along x - axis up to a distance d equal to

Convex lens of focal length 15 cm is kept in series with a concave lens of focal length 30 cm. Find the power of the combination of lenses?

A total reflecting equilateral prism can be used to deviate a ray of light through: (a) 30∘ (b) 60∘ (c) 75∘ (d) 90∘

A charge of 2×10−2 C moves at 30 revolutions per second in a circle of diameter 80 cm. Find the current linked with the circuit.

An object moves with a uniform velocity when the net force acting on it is___ .

What is the position of G with respect to E?

What is the difference between intramolecular force and intermolecular force?

Alena of focal length 5 cm is being used by a student in the laboratory as a magnifying glass. His least distansd of distinct vision is 25cm. What magnification Is the student getting.

As i know that difference in pressure is potential difference. Then here what is the meaning of pressure difference?

The heat produced by passing an electric current through a fixed resistor is proportional to the square of : (a) magnitude of resistance of the resistor (b) temperature of the resistor (c) magnitude of current (d) time for which current is passed

State the principle of an electric generator. [2 MARKS]

Which of the following things released due to mining causes major environmental degradation?

The output current of a transformer in which the voltage is stepped down is usually higher than the input current. Explain why?

State the direction of the incident ray which after reflection from a spherical mirror retraces its path. Give a reason for your answer.

When sunlight enters the earth's atmosphere, state which colour of light is scattered (i) the most, and (ii) the least.

Which of the following represents the current-time graph of a generator with a slip ring?

In how much time (in seconds) should a charge of 10 C flow between the two terminals so as to maintain a constant current of 100 A?

The generator works on the concept of ___.

Which of the following processes is the final step in production of electricity?

Two similar resistors R are connected in series and than in parallel. Find the ratio of their effective resistance in series to parallel.

A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24W resistance, which may be used separately in series or in parallel. What are the currents in the three cases?

All the formulas from electricity chapter

Why does Sun appear slightly oval shaped at morning and evening?

Select the molecule from the following which has polar bond but dipole moment is zero.

Which of the following is not included in three R's approach?

If the charge of an electron is 1.6*10-19 coulombs, how many electrons should pass through a conductor in 1 second to constitute 1 ampere current?

Short circuit occurs

In how many seconds should a charge of 10 C flow between two terminals so as to maintain a constant current of 100 A?

A tuning fork and a sonometer wire were sounded together and produce 4 beats per second. When the length of sonometer wire is 95 cm or 100 cm, the frequency of the tuning fork is

Question 15 (b) State the rule to determine the direction of a (ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.

A large coal-fired power station produces 2000 MW of electrical energy. A wind turbine with 33 m blades can produce 300 kw. (a) How many turbines would be needed to replace the power station? (b) Why, in actual practice, this number of turbines could not replace the coal-fired power station ?

The calorific values of five fuels A, B, C, D and E are given below: A 48 kJ/g B 17 kJ/g C 150 kJ/g D 50kJ/g E 30kJ/g Which of the fuels could be: (i) cooking gas (ii) alcohol (iii) wood (iv) hydrogen (v) kerosene?

State one condition for a body to execute the natural vibrations.

Which mirror is used as a street light reflector?

50 g of copper is heated to increase its temperature by 10∘C. If the same quantity of heat is given to 10 g of water, the rise in its temperature is: (Given: Specific heat of copper = 420 Joule kg−1∘C−1, Specific heat of water = 4200 Joule kg−1∘C−1)

Which of the following do not conduct electricity in their aqueous solution?

The earth revolves about the sun in an elliptical orbit with mean radius 9.3×107m in a period of 1 year. Assuming that there are no outside influences

what is the meaning of "potential" in physics?

Which of these sets lists the major greenhouse gases?

What should be the rating of an electric fuse for a micro oven, which is operating on a current rating of 5A?

Give some examples of primary cells.

Ocean-thermal-energy conversion plants can operate if the temperature difference between the water at the surface and water at depths up to 2 kilometers are _____________ K or more.

The unit of electrical power is:

A particle of charge q and mass m moving with velocity v along the x - axis enters the region x>0 with uniform magnetic field B along positive z direction. The particle will penetrate in this region along x - axis up to a distance d equal to