16569 + Interview Questions in Physics

1.	A mass m1 of a substance of specific heat capacity c1 at temperature t1 is mixed with a mass m2 of other substance of specific heat capacity c2 at a lower temperature t2.Deduce the expression for the temperature t of the mixture.State the assumption made,if any.
Answer» A mass $m_{1}$ of a substance of specific heat capacity $c_{1}$ at temperature $t_{1}$ is mixed with a mass $m_{2}$ of other substance of specific heat capacity $c_{2}$ at a lower temperature $t_{2}$ .Deduce the expression for the temperature t of the mixture.State the assumption made,if any.

Discussion

2.	Would you place the two isotopes chlorine - 35 and chlorine - 37 in different slots because of their different atomic masses or in the same slots because of their same chemical properties? Justify your answer.
Answer» Would you place the two isotopes chlorine - 35 and chlorine - 37 in different slots because of their different atomic masses or in the same slots because of their same chemical properties? Justify your answer.

Discussion

3.	Explain why, the sun can be seen about two minutes before actual sunrise. Draw a diagram to illustrate your answer.
Answer» Explain why, the sun can be seen about two minutes before actual sunrise. Draw a diagram to illustrate your answer.

Discussion

4.	Draw a labelled diagram of an arrangement of two pulleys, one fixed and other movable. In the diagram, mark the directions of all forces acting on it. What is the ideal mechanical advantage of the system? How can it be achieved?
Answer» Draw a labelled diagram of an arrangement of two pulleys, one fixed and other movable. In the diagram, mark the directions of all forces acting on it. What is the ideal mechanical advantage of the system? How can it be achieved?

Discussion

5.	The pressure of a gas in a vessel can be measured by ___ .
Answer» The pressure of a gas in a vessel can be measured by ___ .

Discussion

6.	What is the complementary colour of red?
Answer» What is the complementary colour of red?

Discussion

7.	Why do starts twinkle
Answer» Why do starts twinkle

Discussion

8.	a truck of mass 5000 kg rolls down a hill starting from the rest it covers 200m in 10 seconds then the force acting on it will be
Answer» a truck of mass 5000 kg rolls down a hill starting from the rest it covers 200m in 10 seconds then the force acting on it will be

Discussion

9.	Name the type of a single pulley that has an ideal mechanical advantage equal to 2. Draw a labelled diagram of the pulley mentioned by you.
Answer» Name the type of a single pulley that has an ideal mechanical advantage equal to 2. Draw a labelled diagram of the pulley mentioned by you.

Discussion

10.	The temperature of a body depends on the ___ contained in it.
Answer» The temperature of a body depends on the ___ contained in it.

Discussion

11.	Question 20 Opposition to the construction of large dams is due to (a) social reasons (b) economic reasons (c) enviromental reasons (d) all the above
Answer» Question 20 Opposition to the construction of large dams is due to (a) social reasons (b) economic reasons (c) enviromental reasons (d) all the above

Discussion

12.	What is the role of neutral wire
Answer» What is the role of neutral wire

Discussion

13.	I HAVE A DOUBT ON LENS FORMULA AND I ALSO HAVE A DOUBT IN PROBLEMS RELATED TO MIRROR FORMULA AS WELL AS LENS FORMULA
Answer» I HAVE A DOUBT ON LENS FORMULA AND I ALSO HAVE A DOUBT IN PROBLEMS RELATED TO MIRROR FORMULA AS WELL AS LENS FORMULA

Discussion

14.	From which fundamental units are ampere and current derived?
Answer» From which fundamental units are ampere and current derived?

Discussion

15.	The bob of a simple pendulum is imparted a velocity of 5 metre per second when it is at its mean position. To what maximum vertical height will it rise on reaching at its extreme position if 60% of its energy is lost in overcoming the friction of air? (g = 10 m per second square)
Answer» The bob of a simple pendulum is imparted a velocity of 5 metre per second when it is at its mean position. To what maximum vertical height will it rise on reaching at its extreme position if 60% of its energy is lost in overcoming the friction of air? (g = 10 m per second square)

Discussion

16.	Do the laws of reflection hold true in the case of irregular reflection? Explain.
Answer» Do the laws of reflection hold true in the case of irregular reflection? Explain.

Discussion

17.	An observer stands at a distance of 850 m from the cliff and fires a gun. After what time gap will he hear the echo, if sound travels at a speed of 350 ms−1 in air?
Answer» An observer stands at a distance of 850 m from the cliff and fires a gun. After what time gap will he hear the echo, if sound travels at a speed of $350 m s^{- 1}$ in air?

Discussion

18.	An electric motor takes 5 amperes current from a 220 volt supply line. Calculate the power of the motor and electrical energy consumed by it in 2 hours.
Answer» An electric motor takes 5 amperes current from a 220 volt supply line. Calculate the power of the motor and electrical energy consumed by it in 2 hours.

Discussion

19.	Which part of bi-focal lens should a person use to read? And why?
Answer» Which part of bi-focal lens should a person use to read? And why?

Discussion

20.	Give the scientific names of the following parts of the eye : (a) carries signals from an eye to the brain. (b) muscles which change the shape of the eye-lens. (c) a hole in the middle of the iris. (d) a clear window at the front of the eye. (e) changes shape to focus a picture on the retina.
Answer» Give the scientific names of the following parts of the eye : (a) carries signals from an eye to the brain. (b) muscles which change the shape of the eye-lens. (c) a hole in the middle of the iris. (d) a clear window at the front of the eye. (e) changes shape to focus a picture on the retina.

Discussion

21.	A ball whose kinetic energy is E is thrown at an angle of 45∘ with the horizontal. Its kinetic energy at the highest point of its trajectory will be:
Answer» A ball whose kinetic energy is E is thrown at an angle of $45^{\circ}$ with the horizontal. Its kinetic energy at the highest point of its trajectory will be:

Discussion

22.	A device which is commonly used to convert an electrical signal into a visual signal.
Answer» A device which is commonly used to convert an electrical signal into a visual signal.

Discussion

23.	Which of the following is correct about work?
Answer» Which of the following is correct about work?

Discussion

24.	(a) Complete the circuit given in Fig. 9.17 by inserting between the terminals A and C, an ammeter. (b) In the diagram mark the polarity at the terminals of ammeter and indicate clearly the direction of flow of current in the circuit, when the circuit is complete. (c) Name and state the purpose of Rh in the circuit.
Answer» (a) Complete the circuit given in Fig. 9.17 by inserting between the terminals A and C, an ammeter. (b) In the diagram mark the polarity at the terminals of ammeter and indicate clearly the direction of flow of current in the circuit, when the circuit is complete. (c) Name and state the purpose of Rh in the circuit.

24.

(a) Complete the circuit given in Fig. 9.17 by inserting between the terminals A and C, an ammeter. (b) In the diagram mark the polarity at the terminals of ammeter and indicate clearly the direction of flow of current in the circuit, when the circuit is complete. (c) Name and state the purpose of Rh in the circuit.

Answer»

(a) Complete the circuit given in Fig. 9.17 by inserting between the terminals A and C, an ammeter. (b) In the diagram mark the polarity at the terminals of ammeter and indicate clearly the direction of flow of current in the circuit, when the circuit is complete. (c) Name and state the purpose of Rh in the circuit.

Discussion

25.	A block and tackle system has the velocity ratio 3. Draw a labelled diagram of the system indicating the points of application and the directions of load L and effort E. A man can exert a pull of 200 kgf. (a) What is the maximum load he can raise with this pulley system if its efficiency is 60% ? (b) If the effort end moves a distance 60 cm, what distance does the load move ?
Answer» A block and tackle system has the velocity ratio 3. Draw a labelled diagram of the system indicating the points of application and the directions of load L and effort E. A man can exert a pull of 200 kgf. (a) What is the maximum load he can raise with this pulley system if its efficiency is $60 %$ ? (b) If the effort end moves a distance 60 cm, what distance does the load move ?

Discussion

26.	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___.

26.

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

27.	What is the value of g at the centre of earth?
Answer» What is the value of g at the centre of earth?

Discussion

28.	The radius of curvature of a concave mirror is 10 cm. At what distance from the pole of the mirror would an image of the sun be formed?
Answer» The radius of curvature of a concave mirror is 10 cm. At what distance from the pole of the mirror would an image of the sun be formed?

Discussion

29.	The aviation fuel which is used in the engines of jet aeroplanes is : (a) diesel (b) kerosene (c) petrol (d) CNG
Answer» The aviation fuel which is used in the engines of jet aeroplanes is : (a) diesel (b) kerosene (c) petrol (d) CNG

Discussion

30.	A diverging mirror is : (a) a plane mirror (b) a convex mirror (c) a concave mirror (d) a shaving mirror
Answer» A diverging mirror is : (a) a plane mirror (b) a convex mirror (c) a concave mirror (d) a shaving mirror

Discussion

31.	Which of the following are the properties of infrared radiation?
Answer» Which of the following are the properties of infrared radiation?

Discussion

32.	Nuclear Fission/fusion occurs with destruction of same mass and evolution of large amount of energy.But law of conservation of mass says that mass can neither be created nor be destroyed. How?
Answer» Nuclear Fission/fusion occurs with destruction of same mass and evolution of large amount of energy.But law of conservation of mass says that mass can neither be created nor be destroyed. How?

Discussion

33.	An electric bulb is rated (60W, 220 V). If it is operated at 110 V, then find the power consumed by it.
Answer» An electric bulb is rated (60W, 220 V). If it is operated at 110 V, then find the power consumed by it.

Discussion

34.	What kind of mirror is required for obtaining a virtual image of the same size as the object ?
Answer» What kind of mirror is required for obtaining a virtual image of the same size as the object ?

Discussion

35.	Write the formula for a lens connecting image distance(v), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula ?
Answer» Write the formula for a lens connecting image distance(v), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula ?

Discussion

36.	An object is 0.09 m from a magnifying lens and the image is formed 36 cm from the lens. The magnification produced is : (a) 0.4 (b) 1.4 (c) 4.0 (d) 4.5
Answer» An object is 0.09 m from a magnifying lens and the image is formed 36 cm from the lens. The magnification produced is : (a) 0.4 (b) 1.4 (c) 4.0 (d) 4.5

Discussion

37.	How magnetism related to the core and mantle og the earth??????
Answer» How magnetism related to the core and mantle og the earth??????

Discussion

38.	Who is the father of electrodynamics?
Answer» Who is the father of electrodynamics?

Discussion

39.	Which of the following prevents undue tightening of a screw gauge?
Answer» Which of the following prevents undue tightening of a screw gauge?

Discussion

40.	Two men A & B perform the same amount of work. B performs the work in 1/50th of the time as compared to A. Calculate the ratio of their powers.
Answer» Two men A & B perform the same amount of work. B performs the work in 1/50^th of the time as compared to A. Calculate the ratio of their powers.

Discussion

41.	Which of the following solutions will conduct electricity?
Answer» Which of the following solutions will conduct electricity?

Discussion

42.	Name the defect of vision which can be corrected by a converging lens. Show clearly by a ray diagram how the lens corrects the defect.
Answer» Name the defect of vision which can be corrected by a converging lens. Show clearly by a ray diagram how the lens corrects the defect.

Discussion

43.	The quantity of matter in a body regardless of its volume or of any force acting on it is called its
Answer» The quantity of matter in a body regardless of its volume or of any force acting on it is called its

Discussion

44.	An electric heater of resistance 8Ω takes a current of 15 A from the main supply line. Calculate the rate at which heat is developed in the heater.
Answer» An electric heater of resistance $8 Ω$ takes a current of 15 A from the main supply line. Calculate the rate at which heat is developed in the heater.

Discussion

45.	Class III levers have the mechanial advantage less than 1. Why are they then used ?
Answer» Class III levers have the mechanial advantage less than 1. Why are they then used ?

Discussion

46.	What type of nuclear reaction is responsible for the liberation of energy : (a) in a nuclear reactor? (b) in the sun?
Answer» What type of nuclear reaction is responsible for the liberation of energy : (a) in a nuclear reactor? (b) in the sun?

Discussion

47.	An electric heater is rated 1000 W-200 V. The resistance of the heating element will be:
Answer» An electric heater is rated 1000 W-200 V. The resistance of the heating element will be:

Discussion

48.	Which of the following places would be least likely to use robots?
Answer» Which of the following places would be least likely to use robots?

Discussion

49.	Two blocks identical in shape and size but made of different materials are acted upon equal forces which cause them to slide on a horizontal surface. The acceleration of the second block is found to be 3 times that of the first. What is the ratio of the mass of the second to the first?
Answer» Two blocks identical in shape and size but made of different materials are acted upon equal forces which cause them to slide on a horizontal surface. The acceleration of the second block is found to be 3 times that of the first. What is the ratio of the mass of the second to the first?

Discussion

50.	Which of the two is connected in series: ammeter or voltmeter?
Answer» Which of the two is connected in series: ammeter or voltmeter?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A mass m1 of a substance of specific heat capacity c1 at temperature t1 is mixed with a mass m2 of other substance of specific heat capacity c2 at a lower temperature t2.Deduce the expression for the temperature t of the mixture.State the assumption made,if any.

Would you place the two isotopes chlorine - 35 and chlorine - 37 in different slots because of their different atomic masses or in the same slots because of their same chemical properties? Justify your answer.

Explain why, the sun can be seen about two minutes before actual sunrise. Draw a diagram to illustrate your answer.

Draw a labelled diagram of an arrangement of two pulleys, one fixed and other movable. In the diagram, mark the directions of all forces acting on it. What is the ideal mechanical advantage of the system? How can it be achieved?

The pressure of a gas in a vessel can be measured by ___ .

What is the complementary colour of red?

Why do starts twinkle

a truck of mass 5000 kg rolls down a hill starting from the rest it covers 200m in 10 seconds then the force acting on it will be

Name the type of a single pulley that has an ideal mechanical advantage equal to 2. Draw a labelled diagram of the pulley mentioned by you.

The temperature of a body depends on the ___ contained in it.

Question 20 Opposition to the construction of large dams is due to (a) social reasons (b) economic reasons (c) enviromental reasons (d) all the above

What is the role of neutral wire

I HAVE A DOUBT ON LENS FORMULA AND I ALSO HAVE A DOUBT IN PROBLEMS RELATED TO MIRROR FORMULA AS WELL AS LENS FORMULA

From which fundamental units are ampere and current derived?

The bob of a simple pendulum is imparted a velocity of 5 metre per second when it is at its mean position. To what maximum vertical height will it rise on reaching at its extreme position if 60% of its energy is lost in overcoming the friction of air? (g = 10 m per second square)

Do the laws of reflection hold true in the case of irregular reflection? Explain.

An observer stands at a distance of 850 m from the cliff and fires a gun. After what time gap will he hear the echo, if sound travels at a speed of 350 ms−1 in air?

An electric motor takes 5 amperes current from a 220 volt supply line. Calculate the power of the motor and electrical energy consumed by it in 2 hours.

Which part of bi-focal lens should a person use to read? And why?

Give the scientific names of the following parts of the eye : (a) carries signals from an eye to the brain. (b) muscles which change the shape of the eye-lens. (c) a hole in the middle of the iris. (d) a clear window at the front of the eye. (e) changes shape to focus a picture on the retina.

A ball whose kinetic energy is E is thrown at an angle of 45∘ with the horizontal. Its kinetic energy at the highest point of its trajectory will be:

A device which is commonly used to convert an electrical signal into a visual signal.

Which of the following is correct about work?

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

What is the value of g at the centre of earth?

The radius of curvature of a concave mirror is 10 cm. At what distance from the pole of the mirror would an image of the sun be formed?

The aviation fuel which is used in the engines of jet aeroplanes is : (a) diesel (b) kerosene (c) petrol (d) CNG

A diverging mirror is : (a) a plane mirror (b) a convex mirror (c) a concave mirror (d) a shaving mirror

Which of the following are the properties of infrared radiation?

Nuclear Fission/fusion occurs with destruction of same mass and evolution of large amount of energy.But law of conservation of mass says that mass can neither be created nor be destroyed. How?

An electric bulb is rated (60W, 220 V). If it is operated at 110 V, then find the power consumed by it.

What kind of mirror is required for obtaining a virtual image of the same size as the object ?

Write the formula for a lens connecting image distance(v), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula ?

An object is 0.09 m from a magnifying lens and the image is formed 36 cm from the lens. The magnification produced is : (a) 0.4 (b) 1.4 (c) 4.0 (d) 4.5

How magnetism related to the core and mantle og the earth??????

Who is the father of electrodynamics?

Which of the following prevents undue tightening of a screw gauge?

Two men A &amp; B perform the same amount of work. B performs the work in 1/50th of the time as compared to A. Calculate the ratio of their powers.

Which of the following solutions will conduct electricity?

Name the defect of vision which can be corrected by a converging lens. Show clearly by a ray diagram how the lens corrects the defect.

The quantity of matter in a body regardless of its volume or of any force acting on it is called its

An electric heater of resistance 8Ω takes a current of 15 A from the main supply line. Calculate the rate at which heat is developed in the heater.

Class III levers have the mechanial advantage less than 1. Why are they then used ?

What type of nuclear reaction is responsible for the liberation of energy : (a) in a nuclear reactor? (b) in the sun?

An electric heater is rated 1000 W-200 V. The resistance of the heating element will be:

Which of the following places would be least likely to use robots?

Two blocks identical in shape and size but made of different materials are acted upon equal forces which cause them to slide on a horizontal surface. The acceleration of the second block is found to be 3 times that of the first. What is the ratio of the mass of the second to the first?

Which of the two is connected in series: ammeter or voltmeter?

Two men A & B perform the same amount of work. B performs the work in 1/50th of the time as compared to A. Calculate the ratio of their powers.