16569 + Interview Questions in Physics

1.	Question 8 (c) Name the type of mirror used in the given situation. Solar furnace Support your answer with reason.
Answer» Question 8 (c) Name the type of mirror used in the given situation. Solar furnace Support your answer with reason.

Discussion

2.	In the figure given below, a coil is placed between two permanent magnets and it is rotated with the help of an axle, on which two rings R1 and R2 are internally attached. B1 and B2 represents metallic brushes. G represents galvanometer. The current flowing through the circuit reverses direction periodically, such a current is called alternating current. The current can be made direct by ___.
Answer» In the figure given below, a coil is placed between two permanent magnets and it is rotated with the help of an axle, on which two rings R1 and R2 are internally attached. B1 and B2 represents metallic brushes. G represents galvanometer. The current flowing through the circuit reverses direction periodically, such a current is called alternating current. The current can be made direct by ___.

2.

In the figure given below, a coil is placed between two permanent magnets and it is rotated with the help of an axle, on which two rings R1 and R2 are internally attached. B1 and B2 represents metallic brushes. G represents galvanometer. The current flowing through the circuit reverses direction periodically, such a current is called alternating current. The current can be made direct by ___.

Answer»

In the figure given below, a coil is placed between two permanent magnets and it is rotated with the help of an axle, on which two rings R1 and R2 are internally attached. B1 and B2 represents metallic brushes. G represents galvanometer.

The current flowing through the circuit reverses direction periodically, such a current is called alternating current. The current can be made direct by ___.

Discussion

3.	A ray of light at 90°on glass-air interface,then the light ray will...
Answer» A ray of light at 90°on glass-air interface,then the light ray will...

Discussion

4.	Why does light particles stay together and don't disperse? Do phtons travel with same pace, if yes why?
Answer» Why does light particles stay together and don't disperse? Do phtons travel with same pace, if yes why?

Discussion

5.	Name the radiations which are absorbed by the green house gases in the earth's atmosphere.
Answer» Name the radiations which are absorbed by the green house gases in the earth's atmosphere.

Discussion

6.	How does persistence of vision make its use in cinematography? Explain briefly
Answer» How does persistence of vision make its use in cinematography? Explain briefly

Discussion

7.	Blue colour of sea water is due to A) interference of sunlight reflected from the water surface B) scattering of sunlight by the water molecules C) Image of the sky in water D) refraction of sunlight
Answer» Blue colour of sea water is due to A) interference of sunlight reflected from the water surface B) scattering of sunlight by the water molecules C) Image of the sky in water D) refraction of sunlight

Discussion

8.	Does matter oppose external force?
Answer» Does matter oppose external force?

Discussion

9.	Name the two kinds of lens. Draw diagrams to illustrate them.
Answer» Name the two kinds of lens. Draw diagrams to illustrate them.

Discussion

10.	Two factors on which the strength of an induced current depends are:
Answer» Two factors on which the strength of an induced current depends are:

Discussion

11.	For the following block system, if m1>>>>m2, then
Answer» For the following block system, if $m_{1} >>>> m_{2}$ , then

11.

For the following block system, if m1>>>>m2, then

Answer»

For the following block system, if $m_{1} >>>> m_{2}$ , then

Discussion

12.	What is the work done in moving a charge of 0.4 C across two points having a potential difference of 8 V?
Answer» What is the work done in moving a charge of 0.4 C across two points having a potential difference of 8 V?

Discussion

13.	If V is the observed molar volume of real gas and Vid is the molar volume of an ideal gas then Z is___.
Answer» If V is the observed molar volume of real gas and $V_{i d}$ is the molar volume of an ideal gas then Z is___.

Discussion

14.	The phenomenon of scattering of light by the colloidal particles is known as ___.
Answer» The phenomenon of scattering of light by the colloidal particles is known as ___.

Discussion

15.	what is the differece between generator and motor can you pls let me know with 5 differereces
Answer» what is the differece between generator and motor can you pls let me know with 5 differereces

Discussion

16.	Find the angle of refraction in the following figure.
Answer» Find the angle of refraction in the following figure.

16.

Find the angle of refraction in the following figure.

Answer»

Find the angle of refraction in the following figure.

Discussion

17.	What is difference and use of ammeter and galvanometer?
Answer» What is difference and use of ammeter and galvanometer?

Discussion

18.	Figure 5.49 shows an object AB placed on the principal axis of a lens L. The two foci of the lens are F1 and F2. The image formed by the lens is erect, virtual and diminished. Copy the diagram. (a) What type of lens is it? (b) Draw the outline of the lens (L) used. (c) Draw a ray of light starting from B and passing through O. Show the same ray after refraction through the lens. (d) Draw another ray from B, which after passing parallel to the principal axis, is incident on the lens and emerges after refraction from it. (d) Locate the final image formed. [5 MARKS]
Answer» Figure 5.49 shows an object AB placed on the principal axis of a lens L. The two foci of the lens are $F_{1}$ and $F_{2}$ . The image formed by the lens is erect, virtual and diminished. Copy the diagram. (a) What type of lens is it? (b) Draw the outline of the lens (L) used. (c) Draw a ray of light starting from B and passing through O. Show the same ray after refraction through the lens. (d) Draw another ray from B, which after passing parallel to the principal axis, is incident on the lens and emerges after refraction from it. (d) Locate the final image formed. [5 MARKS]

Discussion

19.	If you put one end of a rod of metal in the hot solutions you can feel the heat at other end. what does it mean? What is this property of metals called?
Answer» If you put one end of a rod of metal in the hot solutions you can feel the heat at other end. what does it mean? What is this property of metals called?

Discussion

20.	State whether the following statement is true or false : Tidal energy is one of the forms in which solar energy manifests itself in oceans.
Answer» State whether the following statement is true or false : Tidal energy is one of the forms in which solar energy manifests itself in oceans.

Discussion

21.	Explain electric potential with an example.
Answer» Explain electric potential with an example.

Discussion

22.	The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the given figure.
Answer» The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the given figure.

22.

The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the given figure.

Answer»

The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the given figure.

Discussion

23.	What is the reason behind the use of electromagnets instead of permanent magnets in power generators.
Answer» What is the reason behind the use of electromagnets instead of permanent magnets in power generators.

Discussion

24.	According to Charles'law of expansion of gases, which of the following parameter remains constant?
Answer» According to Charles'law of expansion of gases, which of the following parameter remains constant?

Discussion

25.	Classify as real or virtual, the image of a candle flame formed on a screen by a convex lens. Draw a ray diagram to illustrate how the image is formed.
Answer» Classify as real or virtual, the image of a candle flame formed on a screen by a convex lens. Draw a ray diagram to illustrate how the image is formed.

Discussion

26.	A pump is used to lift 500 kg of water from a depth of 80 m in 10 s.Calculate: (a) the work done by the pump, (b) the power at which the pump works, and (c) the power rating of the pump if its efficiency is 40%.
Answer» A pump is used to lift 500 kg of water from a depth of 80 m in 10 s.Calculate: (a) the work done by the pump, (b) the power at which the pump works, and (c) the power rating of the pump if its efficiency is 40%.

26.

A pump is used to lift 500 kg of water from a depth of 80 m in 10 s.Calculate: (a) the work done by the pump, (b) the power at which the pump works, and (c) the power rating of the pump if its efficiency is 40%.

Answer»

A pump is used to lift 500 kg of water from a depth of 80 m in 10 s.Calculate:

(a) the work done by the pump,

(b) the power at which the pump works, and

(c) the power rating of the pump if its efficiency is 40%.

Discussion

27.	How to guess whether a circuit is in series combination or parallel combination?
Answer» How to guess whether a circuit is in series combination or parallel combination?

Discussion

28.	If mass equivalent to one mass of proton is completely converted into energy then the energy produced is ___.
Answer» If mass equivalent to one mass of proton is completely converted into energy then the energy produced is ___.

Discussion

29.	State the condition when on applying a force, the body has : (a) the translational motion, (b) the rotational motion.
Answer» State the condition when on applying a force, the body has : (a) the translational motion, (b) the rotational motion.

29.

State the condition when on applying a force, the body has : (a) the translational motion, (b) the rotational motion.

Answer»

State the condition when on applying a force, the body has :

(a) the translational motion,

(b) the rotational motion.

Discussion

30.	If a charge of 0.8 C flows through a conductor in 4 seconds, is the amount electric current that flows through it.
Answer» If a charge of $0.8 C$ flows through a conductor in $4$ seconds, is the amount electric current that flows through it.

Discussion

31.	When the thumb of a right hand is pointing in the ___, the direction of curl of fingers will be the direction of magnetic field lines.
Answer» When the thumb of a right hand is pointing in the ___, the direction of curl of fingers will be the direction of magnetic field lines.

Discussion

32.	The energy released by nuclear fission is used to
Answer» The energy released by nuclear fission is used to

Discussion

33.	A copper cube of mass 200 g slides down on a rough inclined plane of inclination 37∘ at a constant speed. Assume that any loss in mechanical energy goes into the copper block as thermal energy. Find the increase in the temperature of the block as it slides 60 cm along the inclined plane. Specific heat capacity of copper = 420 J kg−1K−1. Take sin(37∘)=35
Answer» A copper cube of mass $200 g$ slides down on a rough inclined plane of inclination $37^{\circ}$ at a constant speed. Assume that any loss in mechanical energy goes into the copper block as thermal energy. Find the increase in the temperature of the block as it slides $60 c m$ along the inclined plane. Specific heat capacity of copper = $420 J k g^{- 1} K^{- 1}$ . Take $s i n (37^{\circ}) = \frac{3}{5}$

Discussion

34.	Name the type of mirror used in the design of solar furnaces. Explain how high temperature is achieved by this device.
Answer» Name the type of mirror used in the design of solar furnaces. Explain how high temperature is achieved by this device.

Discussion

35.	An electric lamp of 18A, 60W is connected across a battery of 10V. If the lamp gives out 7.5 J/s for giving out light, What is the percentage of energy that the lamp transforms to light?
Answer» An electric lamp of 18A, 60W is connected across a battery of 10V. If the lamp gives out 7.5 J/s for giving out light, What is the percentage of energy that the lamp transforms to light?

Discussion

36.	What does a 5 A rating on a fuse mean?
Answer» What does a 5 A rating on a fuse mean?

Discussion

37.	Which of the following is not the same as watt?
Answer» Which of the following is not the same as watt?

Discussion

38.	What is the difference between a real image and a virtual image ? Give one example of each type of image.
Answer» What is the difference between a real image and a virtual image ? Give one example of each type of image.

Discussion

39.	A battery of 9 V is connected in series with resistance of 0.2Ω, 0.3Ω, 5Ω, 0.5Ωand12Ω respectively. How much current would flow through the 12Ω resistor?
Answer» A battery of 9 V is connected in series with resistance of 0.2Ω, 0.3Ω, 5Ω, 0.5Ωand12Ω respectively. How much current would flow through the 12Ω resistor?

Discussion

40.	The S.I. unit of specific latent heat is : (a) cal g−1 (b) cal g−1K−1 (c) J kg−1 (d) J kg−1 K−1
Answer» The S.I. unit of specific latent heat is : (a) cal $g^{- 1}$ (b) cal $g^{- 1} K^{- 1}$ (c) $J k g^{- 1}$ (d) J $k g^{- 1} K^{- 1}$

40.

The S.I. unit of specific latent heat is : (a) cal g−1 (b) cal g−1K−1 (c) J kg−1 (d) J kg−1 K−1

Answer»

The S.I. unit of specific latent heat is :

(a) cal $g^{- 1}$

(b) cal $g^{- 1} K^{- 1}$

(c) $J k g^{- 1}$

(d) J $k g^{- 1} K^{- 1}$

Discussion

41.	An imaginary radioactive element decays to form elements X1,X2,X3,X4,X5 and X6, by ejecting two β-particles, followed by an α-particle, and again two (β-particles followed by an α -particle). What are the mass number and the atomic number of X6?
Answer» An imaginary radioactive element decays to form elements $X_{1}, X_{2}, X_{3}, X_{4}, X_{5} a n d X_{6}$ , by ejecting two $β$ -particles, followed by an $α$ -particle, and again two ( $β$ -particles followed by an $α$ -particle). What are the mass number and the atomic number of $X_{6}$ ?

Discussion

42.	Velocity of light in glass is 2×108 ms−1 and in air is 3×108 ms−1. If the ray passes through glass to air, calculate the value of critical angle.
Answer» Velocity of light in glass is $2 \times 10^{8} m s^{- 1}$ and in air is $3 \times 10^{8} m s^{- 1}$ . If the ray passes through glass to air, calculate the value of critical angle.

Discussion

43.	Nocturnal animals (animals which sleep during the day and come out at night) tend to have wide pupils and lot of rods in their retinas. Suggest reasons for this.
Answer» Nocturnal animals (animals which sleep during the day and come out at night) tend to have wide pupils and lot of rods in their retinas. Suggest reasons for this.

Discussion

44.	What is magnetic moment and what are its units?
Answer» What is magnetic moment and what are its units?

Discussion

45.	A current of 4 A flows around a circuit for 10 s. How much charge flows past a point in the circuit in this time ?
Answer» A current of 4 A flows around a circuit for 10 s. How much charge flows past a point in the circuit in this time ?

Discussion

46.	A body is pivoted at some point. How much force is required to produce 40 N m torque, when it is applied at a distance of 200 cm from the pivot?
Answer» A body is pivoted at some point. How much force is required to produce $40 N m$ torque, when it is applied at a distance of $200 c m$ from the pivot?

Discussion

47.	A wire stretched between the two fixed supports, is plucked exacly in the middle and then released. It executes (neglect the resistance of the medium) : (a) resonant vibrations (b) natural vibrations (c) damped vibrations (d) forced vibrations.
Answer» A wire stretched between the two fixed supports, is plucked exacly in the middle and then released. It executes (neglect the resistance of the medium) : (a) resonant vibrations (b) natural vibrations (c) damped vibrations (d) forced vibrations.

47.

A wire stretched between the two fixed supports, is plucked exacly in the middle and then released. It executes (neglect the resistance of the medium) : (a) resonant vibrations (b) natural vibrations (c) damped vibrations (d) forced vibrations.

Answer»

A wire stretched between the two fixed supports, is plucked exacly in the middle and then released. It executes (neglect the resistance of the medium) :

(a) resonant vibrations (b) natural vibrations

(c) damped vibrations (d) forced vibrations.

Discussion

48.	Change in no. of magnetic field lines induces
Answer» Change in no. of magnetic field lines induces

Discussion

49.	Is split and slip rings types of commutators?
Answer» Is split and slip rings types of commutators?

Discussion

50.	Three bulbs 40W, 60W and 100W are connected to 220V mains. Which bulb will glow brightly if they are connected in series?
Answer» Three bulbs 40W, 60W and 100W are connected to 220V mains. Which bulb will glow brightly if they are connected in series?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Question 8 (c) Name the type of mirror used in the given situation. Solar furnace Support your answer with reason.

A ray of light at 90°on glass-air interface,then the light ray will...

Why does light particles stay together and don't disperse? Do phtons travel with same pace, if yes why?

Name the radiations which are absorbed by the green house gases in the earth's atmosphere.

How does persistence of vision make its use in cinematography? Explain briefly

Blue colour of sea water is due to A) interference of sunlight reflected from the water surface B) scattering of sunlight by the water molecules C) Image of the sky in water D) refraction of sunlight

Does matter oppose external force?

Name the two kinds of lens. Draw diagrams to illustrate them.

Two factors on which the strength of an induced current depends are:

For the following block system, if m1&gt;&gt;&gt;&gt;m2, then

What is the work done in moving a charge of 0.4 C across two points having a potential difference of 8 V?

If V is the observed molar volume of real gas and Vid is the molar volume of an ideal gas then Z is___.

The phenomenon of scattering of light by the colloidal particles is known as ___.

what is the differece between generator and motor can you pls let me know with 5 differereces

Find the angle of refraction in the following figure.

What is difference and use of ammeter and galvanometer?

If you put one end of a rod of metal in the hot solutions you can feel the heat at other end. what does it mean? What is this property of metals called?

State whether the following statement is true or false : Tidal energy is one of the forms in which solar energy manifests itself in oceans.

Explain electric potential with an example.

The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the given figure.

What is the reason behind the use of electromagnets instead of permanent magnets in power generators.

According to Charles'law of expansion of gases, which of the following parameter remains constant?

Classify as real or virtual, the image of a candle flame formed on a screen by a convex lens. Draw a ray diagram to illustrate how the image is formed.

A pump is used to lift 500 kg of water from a depth of 80 m in 10 s.Calculate: (a) the work done by the pump, (b) the power at which the pump works, and (c) the power rating of the pump if its efficiency is 40%.

How to guess whether a circuit is in series combination or parallel combination?

If mass equivalent to one mass of proton is completely converted into energy then the energy produced is ___.

State the condition when on applying a force, the body has : (a) the translational motion, (b) the rotational motion.

If a charge of 0.8 C flows through a conductor in 4 seconds, is the amount electric current that flows through it.

When the thumb of a right hand is pointing in the ___, the direction of curl of fingers will be the direction of magnetic field lines.

The energy released by nuclear fission is used to

Name the type of mirror used in the design of solar furnaces. Explain how high temperature is achieved by this device.

An electric lamp of 18A, 60W is connected across a battery of 10V. If the lamp gives out 7.5 J/s for giving out light, What is the percentage of energy that the lamp transforms to light?

What does a 5 A rating on a fuse mean?

Which of the following is not the same as watt?

What is the difference between a real image and a virtual image ? Give one example of each type of image.

A battery of 9 V is connected in series with resistance of 0.2Ω, 0.3Ω, 5Ω, 0.5Ωand12Ω respectively. How much current would flow through the 12Ω resistor?

The S.I. unit of specific latent heat is : (a) cal g−1 (b) cal g−1K−1 (c) J kg−1 (d) J kg−1 K−1

An imaginary radioactive element decays to form elements X1,X2,X3,X4,X5 and X6, by ejecting two β-particles, followed by an α-particle, and again two (β-particles followed by an α -particle). What are the mass number and the atomic number of X6?

Velocity of light in glass is 2×108 ms−1 and in air is 3×108 ms−1. If the ray passes through glass to air, calculate the value of critical angle.

Nocturnal animals (animals which sleep during the day and come out at night) tend to have wide pupils and lot of rods in their retinas. Suggest reasons for this.

What is magnetic moment and what are its units?

A current of 4 A flows around a circuit for 10 s. How much charge flows past a point in the circuit in this time ?

A body is pivoted at some point. How much force is required to produce 40 N m torque, when it is applied at a distance of 200 cm from the pivot?

A wire stretched between the two fixed supports, is plucked exacly in the middle and then released. It executes (neglect the resistance of the medium) : (a) resonant vibrations (b) natural vibrations (c) damped vibrations (d) forced vibrations.

Change in no. of magnetic field lines induces

Is split and slip rings types of commutators?

Three bulbs 40W, 60W and 100W are connected to 220V mains. Which bulb will glow brightly if they are connected in series?

For the following block system, if m1>>>>m2, then