16569 + Interview Questions in Physics

1.	A person cannot see objects clearly beyond 50 cm. What should be the power of corrective lens used ?
Answer» A person cannot see objects clearly beyond $50 cm .$ What should be the power of corrective lens used ?

Discussion

2.	In a Carnot engine, when T2=0∘C and T1=200∘C, its efficiency is η1 and when T1=0∘C and T2=−200∘C, Its efficiency is η2, then what is η1η2
Answer» In a Carnot engine, when $T_{2} = 0^{\circ} C$ and $T_{1} = 200^{\circ} C$ , its efficiency is $η_{1}$ and when $T_{1} = 0^{\circ} C$ and $T_{2} = - 200^{\circ} C$ , Its efficiency is $η_{2}$ , then what is $\frac{η_{1}}{η_{2}}$

Discussion

3.	A ray of light incident at a point on the principal axis of a convex lens passes undeviated through the lens. (a) What special name is given to this point on the principal axis ? (b) Draw a labelled diagram to support answer in part (a).
Answer» A ray of light incident at a point on the principal axis of a convex lens passes undeviated through the lens. (a) What special name is given to this point on the principal axis ? (b) Draw a labelled diagram to support answer in part (a).

Discussion

4.	Question 5 Compare and contrast bio-mass and hydro electricity as sources of energy.
Answer» Question 5 Compare and contrast bio-mass and hydro electricity as sources of energy.

Discussion

5.	4.Two discs are rotating about their axes, normal to the discs and passing through the centres of the discs. Disc D1 has 2 kg mass and 0.2 m radius and initial angular velocity of 50 rad s–1. Disc D2 has 4kg mass, 0.1 m radius and initial angular velocity of 200 rad s–1. The two discs are brought in contact face to face, with their axes of rotation coincident. The final angular velocity (in rad.s–1) of the system is
Answer» 4.Two discs are rotating about their axes, normal to the discs and passing through the centres of the discs. Disc D1 has 2 kg mass and 0.2 m radius and initial angular velocity of 50 rad s–1. Disc D2 has 4kg mass, 0.1 m radius and initial angular velocity of 200 rad s–1. The two discs are brought in contact face to face, with their axes of rotation coincident. The final angular velocity (in rad.s–1) of the system is

Discussion

6.	The following setup harnesses which of the following energy?
Answer» The following setup harnesses which of the following energy?

6.

The following setup harnesses which of the following energy?

Answer»

The following setup harnesses which of the following energy?

Discussion

7.	The dis†an ce between the objective lens and the eye piece of an astronomical telescope will be- 1. fo/fe 2.fe/fo 3.fo+fe 4.fo-fe
Answer» The dis†an ce between the objective lens and the eye piece of an astronomical telescope will be- 1. fo/fe 2.fe/fo 3.fo+fe 4.fo-fe

Discussion

8.	A convex lens of focal length 10 cm in contact with a concave lens of focal length 20 cm. This combination is used to focus an object positioned 30 cm infront of combination. The image will be formed at a distance of
Answer» A convex lens of focal length $10 cm$ in contact with a concave lens of focal length $20 cm$ . This combination is used to focus an object positioned $30 cm$ infront of combination. The image will be formed at a distance of

Discussion

9.	A generating station is connected with following loads:1. A lighting load of 200 kW2. An induction motor of 200hp, 0.7 p.f. lagging and efficiency 80%.3. A synchronous motor of 100 hp, efficiency 90%.If the combined p.f. is unity, then the p.f. of synchronous motor is __________ leading. (1 hp = 735.5 W) 0.4
Answer» A generating station is connected with following loads: 1. A lighting load of 200 kW 2. An induction motor of 200hp, 0.7 p.f. lagging and efficiency 80%. 3. A synchronous motor of 100 hp, efficiency 90%. If the combined p.f. is unity, then the p.f. of synchronous motor is __________ leading. (1 hp = 735.5 W) 0.4

Discussion

10.	Where is the vitreous humour located in the human eye?
Answer» Where is the vitreous humour located in the human eye?

Discussion

11.	A cut diamond sparkles because of _________ .
Answer» A cut diamond sparkles because of _________ .

Discussion

12.	A potential difference V is applied across a conductor of length L and diameter d. How is the resistance of the conductor affected when you turn 1)V is halfed2) L is halved and 3)D is doubled justify your answer in each case
Answer» A potential difference V is applied across a conductor of length L and diameter d. How is the resistance of the conductor affected when you turn 1)V is halfed2) L is halved and 3)D is doubled justify your answer in each case

Discussion

13.	An ideal gas of mass m in state A expands to state B via three paths as shown in figure. If Q1,Q2 and Q3 represents the heat absorbed by the gas along these paths, then
Answer» An ideal gas of mass m in state A expands to state B via three paths as shown in figure. If $Q_{1}, Q_{2} and Q_{3}$ represents the heat absorbed by the gas along these paths, then

Discussion

14.	7. 2Hg→Hg2+,E^°=-0.799 v Hg→Hg2+,E^°=-0.855 v Equilibrium constant for the reaction Hg+Hg2+→Hg2(2+) 1)89 2)82.3 3)79 4)none
Answer» 7. 2Hg→Hg2+,E^°=-0.799 v Hg→Hg2+,E^°=-0.855 v Equilibrium constant for the reaction Hg+Hg2+→Hg2(2+) 1)89 2)82.3 3)79 4)none

Discussion

15.	A force F=Kx^2 acts on a particle at an angle of 60^0 with the x- axis .the work done in displacing the particle from x_1 to x_2 will b
Answer» A force F=Kx^2 acts on a particle at an angle of 60^0 with the x- axis .the work done in displacing the particle from x_1 to x_2 will b

Discussion

16.	Explain why, tungsten is used for making the filaments of electric bulbs.
Answer» Explain why, tungsten is used for making the filaments of electric bulbs.

Discussion

17.	Which uses more energy a 250 watt TV set in one hour or a 1200 watt toaster in 10 minutes
Answer» Which uses more energy a 250 watt TV set in one hour or a 1200 watt toaster in 10 minutes

Discussion

18.	Neglecting the rotation of the earth , if suddenly the attractive power of the earth drops to zero, what would happen to a man standing on the earth?
Answer» Neglecting the rotation of the earth , if suddenly the attractive power of the earth drops to zero, what would happen to a man standing on the earth?

Discussion

19.	long wire carrying a current i is bent to form a plane angle θ . If the magnetic field B at a point on the bisector of this angle situated at a dis†an ce x from the vertex is written in the form of K\lbrack cot(θ/4)\rbrack Tesla. Then, find the value of K.
Answer» long wire carrying a current i is bent to form a plane angle θ . If the magnetic field B at a point on the bisector of this angle situated at a dis†an ce x from the vertex is written in the form of K\lbrack cot(θ/4)\rbrack Tesla. Then, find the value of K.

Discussion

20.	The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This ability of eye is known as
Answer» The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This ability of eye is known as

Discussion

21.	Why do medical practitioners focus torches into any accident victim's eyes?
Answer» Why do medical practitioners focus torches into any accident victim's eyes?

Discussion

22.	For the figure given below, find the effective potential difference when the batteries are connected in series.
Answer» For the figure given below, find the effective potential difference when the batteries are connected in series.

Discussion

23.	The negatively charged electrode within a electrical vacuum tube, also the source of electrons is called __________
Answer» The negatively charged electrode within a electrical vacuum tube, also the source of electrons is called __________

23.

The negatively charged electrode within a electrical vacuum tube, also the source of electrons is called __________

Answer»

The negatively charged electrode within a electrical vacuum tube, also the source of electrons is called __________

Discussion

24.	The correct relation between heat produced (H) and electric current (I) flowing is:
Answer» The correct relation between heat produced (H) and electric current (I) flowing is:

Discussion

25.	Question 16An electric kettle consumes 1 KW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?(a) 1 A(b) 2 A(c) 4 A(d) 5 A
Answer» Question 16 An electric kettle consumes 1 KW of electric power when operated at 220 V. A fuse wire of what rating must be used for it? (a) 1 A (b) 2 A (c) 4 A (d) 5 A

Discussion

26.	The given figure shows a coil connected to a centre zero galvanometer G. The galvanometer shows a deflection to the right when the N-pole of a powerful magnet is moved to the right as shown. State the observation in the galvanometer G when the coil is moved away from N.
Answer» The given figure shows a coil connected to a centre zero galvanometer G. The galvanometer shows a deflection to the right when the N-pole of a powerful magnet is moved to the right as shown. State the observation in the galvanometer G when the coil is moved away from N.

26.

The given figure shows a coil connected to a centre zero galvanometer G. The galvanometer shows a deflection to the right when the N-pole of a powerful magnet is moved to the right as shown. State the observation in the galvanometer G when the coil is moved away from N.

Answer»

The given figure shows a coil connected to a centre zero galvanometer G. The galvanometer shows a deflection to the right when the N-pole of a powerful magnet is moved to the right as shown.

State the observation in the galvanometer G when the coil is moved away from N.

Discussion

27.	An isosceles triangular glass prism stands with its base in water as shown. The angles that its two equal sides make with the base are θ each. An incident ray of light parallel to the water surface internally reflects at the glass-water interface and subsequently reemerges into the air. Take the refractive indices of glass and water to be 3/2 and 4/3 respectively. The least value of θ for this to happen must be
Answer» An isosceles triangular glass prism stands with its base in water as shown. The angles that its two equal sides make with the base are $θ$ each. An incident ray of light parallel to the water surface internally reflects at the glass-water interface and subsequently reemerges into the air. Take the refractive indices of glass and water to be $3 / 2$ and $4 / 3$ respectively. The least value of $θ$ for this to happen must be

Discussion

28.	An object is placed in front of a convex mirror at a distance of 60 m from its pole. Object starts moving towards the mirror at 20 ms−1. Find the average speed of the image for a time interval of 2 s if the focal length of the mirror is 20 m.
Answer» An object is placed in front of a convex mirror at a distance of $60 m$ from its pole. Object starts moving towards the mirror at $20 m s^{- 1}$ . Find the average speed of the image for a time interval of $2 s$ if the focal length of the mirror is $20 m$ .

Discussion

29.	24. (a) An electrical bulb is rated 220V - 100W. What is the resistance of the bulb?(b) Three such bulbs run simultaneously for 4 hours. What is the energy consumed?(c) Calculate the cost of running these appliances if the per unit cost is Rs 2.80.
Answer» 24. (a) An electrical bulb is rated 220V - 100W. What is the resistance of the bulb? (b) Three such bulbs run simultaneously for 4 hours. What is the energy consumed? (c) Calculate the cost of running these appliances if the per unit cost is Rs 2.80.

Discussion

30.	Question 1Explain different ways to induce current in a coil.
Answer» Question 1 Explain different ways to induce current in a coil.

Discussion

31.	In an AC circuit only a resistor of resistance 15 ohm is present. If voltage applied is V= 150sin(50t) volt then rms current is?
Answer» In an AC circuit only a resistor of resistance 15 ohm is present. If voltage applied is V= 150sin(50t) volt then rms current is?

Discussion

32.	Which of the following lights has a wavelength greater than that of blue light?
Answer» Which of the following lights has a wavelength greater than that of blue light?

Discussion

33.	A body weighs 60N on Earth. What will be its weight on the moon if the acceleration due to gravity on Moon's surface is g6? Takeg=10ms−2
Answer» A body weighs $60 N$ on Earth. What will be its weight on the moon if the acceleration due to gravity on Moon's surface is $\frac{g}{6}$ ? $Take g = 10 m s^{- 2}$

Discussion

34.	(a) What will happen if slow moving neutrons are made to strike the atoms of a heavy element 23592U ? What is the name of this process ? (b) Write a nuclear equation to represent the process which takes place. (c) Name one installation where such a process is utilised.
Answer» (a) What will happen if slow moving neutrons are made to strike the atoms of a heavy element $23592$ U ? What is the name of this process ? (b) Write a nuclear equation to represent the process which takes place. (c) Name one installation where such a process is utilised.

Discussion

35.	ExplainIn case of thick lens, the ray incident in the direction of optical center is laterally deviated.
Answer» Explain In case of thick lens, the ray incident in the direction of optical center is laterally deviated.

Discussion

36.	Newton's law of gravitation is applicable to:
Answer» Newton's law of gravitation is applicable to:

Discussion

37.	What is meant by noise pollution ? Name one source of sound causing the noise pollution.
Answer» What is meant by noise pollution ? Name one source of sound causing the noise pollution.

Discussion

38.	Car radiators are filled with water. This shows that water
Answer» Car radiators are filled with water. This shows that water

Discussion

39.	Hypermetropia is rectified by using
Answer» Hypermetropia is rectified by using

Discussion

40.	9 Methane and sulphur dioxide are taken in a mass ratio of 4:1 at 2 atm pressure. The molar ratio of methane and sulphur dioxide effusing out initially is a- 32:1 b- 8:1 c- 16:1 d-1:1
Answer» 9 Methane and sulphur dioxide are taken in a mass ratio of 4:1 at 2 atm pressure. The molar ratio of methane and sulphur dioxide effusing out initially is a- 32:1 b- 8:1 c- 16:1 d-1:1

Discussion

41.	if the crystal field splitting in octahedral field for Ni is △ o, then under same condition,the value ofCFSE for Pd will b
Answer» if the crystal field splitting in octahedral field for Ni is △ o, then under same condition,the value ofCFSE for Pd will b

Discussion

42.	If the angle of incidence of sound wave is 30∘, what is the angle of reflection?
Answer» If the angle of incidence of sound wave is $30^{\circ}$ , what is the angle of reflection?

Discussion

43.	A student carries out an experiment and plots the V−I graph of three samples of nichrome wire with resistances R1,R2,and R3 respectively.Which of the following is correct?
Answer» A student carries out an experiment and plots the $V - I$ graph of three samples of nichrome wire with resistances $R 1, R 2, a n d R 3$ respectively. Which of the following is correct?

Discussion

44.	400J of heat is produced in 4second in 4ohms resistor . Find potential difference across the resistor.
Answer» 400J of heat is produced in 4second in 4ohms resistor . Find potential difference across the resistor.

Discussion

45.	An alpha particle enters into a uniform magnetic field as shown in the figure below. The alpha particle will Alpha particle Magnetic field into the page X X X X X X X X X X X X X X X X (1) not deflect when it enters into the magnetic field. (2) deflects out of the page opposite to the direction of magnetic field. (3) deflects towards top of the page as it enters into the magnetic field. (4) deflects towards bottom of the page as it enters into the magnetic field.
Answer» An alpha particle enters into a uniform magnetic field as shown in the figure below. The alpha particle will Alpha particle Magnetic field into the page X X X X X X X X X X X X X X X X (1) not deflect when it enters into the magnetic field. (2) deflects out of the page opposite to the direction of magnetic field. (3) deflects towards top of the page as it enters into the magnetic field. (4) deflects towards bottom of the page as it enters into the magnetic field.

Discussion

46.	Which property of matter is used to measure temperature? Matter in which state is more commonly used?
Answer» Which property of matter is used to measure temperature? Matter in which state is more commonly used?

Discussion

47.	the spring cons†an t of two springs are k1 and k2 respectively springs are stretch up to that limit when potential energy of both becomes equal.the ratio of applied force f1 and f2 on that will be a)k1/k2 b)k2/k1 c)\sqrt{k1/k2} d)\sqrt{k2/k1}
Answer» the spring cons†an t of two springs are k1 and k2 respectively springs are stretch up to that limit when potential energy of both becomes equal.the ratio of applied force f1 and f2 on that will be a)k1/k2 b)k2/k1 c)\sqrt{k1/k2} d)\sqrt{k2/k1}

Discussion

48.	An RC circuit as shown in the figure is driven by an AC source generating a square wave. The output wave pattern monitored by a CRO would look close to:
Answer» An RC circuit as shown in the figure is driven by an AC source generating a square wave. The output wave pattern monitored by a CRO would look close to:

Discussion

49.	Neon lamps are used in botanical gardens and in greenhouses as they:
Answer» Neon lamps are used in botanical gardens and in greenhouses as they:

Discussion

50.	Name five renewable and three non- renewable sources of energy.
Answer» Name five renewable and three non- renewable sources of energy.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A person cannot see objects clearly beyond 50 cm. What should be the power of corrective lens used ?

In a Carnot engine, when T2=0∘C and T1=200∘C, its efficiency is η1 and when T1=0∘C and T2=−200∘C, Its efficiency is η2, then what is η1η2

A ray of light incident at a point on the principal axis of a convex lens passes undeviated through the lens. (a) What special name is given to this point on the principal axis ? (b) Draw a labelled diagram to support answer in part (a).

Question 5 Compare and contrast bio-mass and hydro electricity as sources of energy.

The following setup harnesses which of the following energy?

The dis†an ce between the objective lens and the eye piece of an astronomical telescope will be- 1. fo/fe 2.fe/fo 3.fo+fe 4.fo-fe

A convex lens of focal length 10 cm in contact with a concave lens of focal length 20 cm. This combination is used to focus an object positioned 30 cm infront of combination. The image will be formed at a distance of

Where is the vitreous humour located in the human eye?

A cut diamond sparkles because of _________ .

A potential difference V is applied across a conductor of length L and diameter d. How is the resistance of the conductor affected when you turn 1)V is halfed2) L is halved and 3)D is doubled justify your answer in each case

An ideal gas of mass m in state A expands to state B via three paths as shown in figure. If Q1,Q2 and Q3 represents the heat absorbed by the gas along these paths, then

7. 2Hg→Hg2+,E^°=-0.799 v Hg→Hg2+,E^°=-0.855 v Equilibrium constant for the reaction Hg+Hg2+→Hg2(2+) 1)89 2)82.3 3)79 4)none

A force F=Kx^2 acts on a particle at an angle of 60^0 with the x- axis .the work done in displacing the particle from x_1 to x_2 will b

Explain why, tungsten is used for making the filaments of electric bulbs.

Which uses more energy a 250 watt TV set in one hour or a 1200 watt toaster in 10 minutes

Neglecting the rotation of the earth , if suddenly the attractive power of the earth drops to zero, what would happen to a man standing on the earth?

long wire carrying a current i is bent to form a plane angle θ . If the magnetic field B at a point on the bisector of this angle situated at a dis†an ce x from the vertex is written in the form of K\lbrack cot(θ/4)\rbrack Tesla. Then, find the value of K.

The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This ability of eye is known as

Why do medical practitioners focus torches into any accident victim's eyes?

For the figure given below, find the effective potential difference when the batteries are connected in series.

The negatively charged electrode within a electrical vacuum tube, also the source of electrons is called __________

The correct relation between heat produced (H) and electric current (I) flowing is:

Question 16An electric kettle consumes 1 KW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?(a) 1 A(b) 2 A(c) 4 A(d) 5 A

The given figure shows a coil connected to a centre zero galvanometer G. The galvanometer shows a deflection to the right when the N-pole of a powerful magnet is moved to the right as shown. State the observation in the galvanometer G when the coil is moved away from N.

An object is placed in front of a convex mirror at a distance of 60 m from its pole. Object starts moving towards the mirror at 20 ms−1. Find the average speed of the image for a time interval of 2 s if the focal length of the mirror is 20 m.

24. (a) An electrical bulb is rated 220V - 100W. What is the resistance of the bulb?(b) Three such bulbs run simultaneously for 4 hours. What is the energy consumed?(c) Calculate the cost of running these appliances if the per unit cost is Rs 2.80.

Question 1Explain different ways to induce current in a coil.

In an AC circuit only a resistor of resistance 15 ohm is present. If voltage applied is V= 150sin(50t) volt then rms current is?

Which of the following lights has a wavelength greater than that of blue light?

A body weighs 60N on Earth. What will be its weight on the moon if the acceleration due to gravity on Moon's surface is g6? Takeg=10ms−2

(a) What will happen if slow moving neutrons are made to strike the atoms of a heavy element 23592U ? What is the name of this process ? (b) Write a nuclear equation to represent the process which takes place. (c) Name one installation where such a process is utilised.

ExplainIn case of thick lens, the ray incident in the direction of optical center is laterally deviated.

Newton's law of gravitation is applicable to:

What is meant by noise pollution ? Name one source of sound causing the noise pollution.

Car radiators are filled with water. This shows that water

Hypermetropia is rectified by using

9 Methane and sulphur dioxide are taken in a mass ratio of 4:1 at 2 atm pressure. The molar ratio of methane and sulphur dioxide effusing out initially is a- 32:1 b- 8:1 c- 16:1 d-1:1

if the crystal field splitting in octahedral field for Ni is △ o, then under same condition,the value ofCFSE for Pd will b

If the angle of incidence of sound wave is 30∘, what is the angle of reflection?

A student carries out an experiment and plots the V−I graph of three samples of nichrome wire with resistances R1,R2,and R3 respectively.Which of the following is correct?

400J of heat is produced in 4second in 4ohms resistor . Find potential difference across the resistor.

Which property of matter is used to measure temperature? Matter in which state is more commonly used?

the spring cons†an t of two springs are k1 and k2 respectively springs are stretch up to that limit when potential energy of both becomes equal.the ratio of applied force f1 and f2 on that will be a)k1/k2 b)k2/k1 c)\sqrt{k1/k2} d)\sqrt{k2/k1}

An RC circuit as shown in the figure is driven by an AC source generating a square wave. The output wave pattern monitored by a CRO would look close to:

Neon lamps are used in botanical gardens and in greenhouses as they:

Name five renewable and three non- renewable sources of energy.