16569 + Interview Questions in Physics

1.	{ Q. }33> An AC circuit contains series combination of }X and }Y and the current is found to be ahead of the voltage }}{ by }π/4 . If element }X is a pure resistor of }100 ohm, identify }Y and find the rms current. }}{ Given that rms voltage is }141 volt.
Answer» { Q. }33> An AC circuit contains series combination of }X and }Y and the current is found to be ahead of the voltage }}{ by }π/4 . If element }X is a pure resistor of }100 ohm, identify }Y and find the rms current. }}{ Given that rms voltage is }141 volt.

Discussion

2.	A puppy is tied by a rope of 20 m long to a point P which is 12 m from a fence as shown in the figure. Pick out the correct inference from the options.
Answer» A puppy is tied by a rope of 20 m long to a point P which is 12 m from a fence as shown in the figure. Pick out the correct inference from the options.

2.

A puppy is tied by a rope of 20 m long to a point P which is 12 m from a fence as shown in the figure. Pick out the correct inference from the options.

Answer»

A puppy is tied by a rope of 20 m long to a point P which is 12 m from a fence as shown in the figure.

Pick out the correct inference from the options.

Discussion

3.	Question 3 (f)State whether the following statement is true or false.Unwanted or unpleasant sound is termed as music.
Answer» Question 3 (f) State whether the following statement is true or false. Unwanted or unpleasant sound is termed as music.

Discussion

4.	A force on 3g particle in such a way that the position of the particle as function of time is given x=3t -4t^{2^{ +t^3,where x is in meters and t is in seconds.The work done during the first 4 second is?
Answer» A force on 3g particle in such a way that the position of the particle as function of time is given x=3t -4t^{2^{ +t^3,where x is in meters and t is in seconds.The work done during the first 4 second is?

Discussion

5.	How much heat energy is produced in 10 second in an electric iron having resistance 440 Ω, when a potential difference of 220 volt is applied across it?
Answer» How much heat energy is produced in 10 second in an electric iron having resistance 440 Ω, when a potential difference of 220 volt is applied across it?

Discussion

6.	If F1 and F2 represents the foci of the lens, then at which point will the light rays meet?
Answer» If $F_{1}$ and $F_{2}$ represents the foci of the lens, then at which point will the light rays meet?

Discussion

7.	A balloon contains 1.2 L of air at a particular temperature and 90 cm Hg pressure. Keeping the temperature constant if the pressure of air is reduced to 70 cm Hg, then what will be the volume of that air?
Answer» A balloon contains 1.2 L of air at a particular temperature and 90 cm Hg pressure. Keeping the temperature constant if the pressure of air is reduced to 70 cm Hg, then what will be the volume of that air?

Discussion

8.	Question 6 A stone of 1 kg is thrown with a velocity of 20 ms−1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?
Answer» Question 6 A stone of 1 kg is thrown with a velocity of $20 m s^{- 1}$ across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?

Discussion

9.	72. d focal lengths of a thin lens for red and violet light r 90.0cm and 86.4 cm respectively.Find d desprsive power of a material of d lens .make appropriate assumptions
Answer» 72. d focal lengths of a thin lens for red and violet light r 90.0cm and 86.4 cm respectively.Find d desprsive power of a material of d lens .make appropriate assumptions

Discussion

10.	Why does the sun appear red at the time of sunset and sunrise? Explain. [3 MARKS]
Answer» Why does the sun appear red at the time of sunset and sunrise? Explain. [3 MARKS]

Discussion

11.	How rate of reaction depends on activation energy
Answer» How rate of reaction depends on activation energy

Discussion

12.	3) The values of two resistors are R1 = (6 \pm 0.3) kΩ and R2 = (10 \pm 0.2) kΩ. The percentage error in the equivalent resis†an ce when they are connected in parallel is Op
Answer» 3) The values of two resistors are R1 = (6 \pm 0.3) kΩ and R2 = (10 \pm 0.2) kΩ. The percentage error in the equivalent resis†an ce when they are connected in parallel is Op

Discussion

13.	Question 4 (a)How can you as an individual contribute or make a difference to the management of(a) forests and wildlife?
Answer» Question 4 (a) How can you as an individual contribute or make a difference to the management of (a) forests and wildlife?

Discussion

14.	ntLight is incident from glass (RI=1.5) to water (RI=1.33). Find the range of angle of deviation for which there are two angles of incidence.n
Answer» ntLight is incident from glass (RI=1.5) to water (RI=1.33). Find the range of angle of deviation for which there are two angles of incidence.n

Discussion

15.	During a sunny day, the number plate of a car travelling on the highway seems to flicker for a person walking at a distant in the opposite direction. Why?
Answer» During a sunny day, the number plate of a car travelling on the highway seems to flicker for a person walking at a distant in the opposite direction. Why?

Discussion

16.	Why voltmeter is not connected in series?
Answer» Why voltmeter is not connected in series?

Discussion

17.	3.In the circuit shown, the internal resistance of the cell is negligible. the steady state current in the 2 row resistor is 1. 0.6A. 2. 1.2A 3. 0.9A. 4. 1.5A Hint: remove the branch containing the capacitor along with 4 Ω resistor as there is no current flowing through it.
Answer» 3.In the circuit shown, the internal resistance of the cell is negligible. the steady state current in the 2 row resistor is 1. 0.6A. 2. 1.2A 3. 0.9A. 4. 1.5A Hint: remove the branch containing the capacitor along with 4 Ω resistor as there is no current flowing through it.

Discussion

18.	If current flowed in the circuit from A-B-C-D. Then in which direction did the electron flow happen?
Answer» If current flowed in the circuit from A-B-C-D. Then in which direction did the electron flow happen?

18.

If current flowed in the circuit from A-B-C-D. Then in which direction did the electron flow happen?

Answer»

If current flowed in the circuit from A-B-C-D. Then in which direction did the electron flow happen?

Discussion

19.	This phenomenon reverberation can be observed in:
Answer» This phenomenon reverberation can be observed in:

Discussion

20.	A ray of light strikes the surface of a rectangular glass block such that the angle of incidence is 42° , the path taken by the ray in each case as it passes through the glass block and emerges from it is such that
Answer» A ray of light strikes the surface of a rectangular glass block such that the angle of incidence is 42° , the path taken by the ray in each case as it passes through the glass block and emerges from it is such that

Discussion

21.	Why are strong magnets around the armature of a motor curved in shape?
Answer» Why are strong magnets around the armature of a motor curved in shape?

Discussion

22.	In an electric circuit R,L,C and an a.c. voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the circuit is pi/3. If instead, C is removed from the circuit, the phase difference is again pi/3. The power factor of the circuit is?
Answer» In an electric circuit R,L,C and an a.c. voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the circuit is pi/3. If instead, C is removed from the circuit, the phase difference is again pi/3. The power factor of the circuit is?

Discussion

23.	In the given mirror C – The center of the sphere to which the mirror is part of F – The focus of the mirror P – Pole of mirror A – Point on the mirror D – The point on the principal axis. If a ray of light starts from C and is incident on A from which point will the reflected ray pass through:
Answer» In the given mirror C – The center of the sphere to which the mirror is part of F – The focus of the mirror P – Pole of mirror A – Point on the mirror D – The point on the principal axis. If a ray of light starts from C and is incident on A from which point will the reflected ray pass through:

23.

In the given mirror C – The center of the sphere to which the mirror is part of F – The focus of the mirror P – Pole of mirror A – Point on the mirror D – The point on the principal axis. If a ray of light starts from C and is incident on A from which point will the reflected ray pass through:

Answer»

In the given mirror

C – The center of the sphere to which the mirror is part of

F – The focus of the mirror

P – Pole of mirror

A – Point on the mirror

D – The point on the principal axis.

If a ray of light starts from C and is incident on A from which point will the reflected ray pass through:

Discussion

24.	A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60° is W. Now the torque required to keep the magnet in this new position is
Answer» A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by $60 °$ is $W$ . Now the torque required to keep the magnet in this new position is

Discussion

25.	29. The increasing order of specific charge of electron,proton,alpha particle,neutron is
Answer» 29. The increasing order of specific charge of electron,proton,alpha particle,neutron is

Discussion

26.	Two wires A and B of the same material have their lengths in the ratio 1:2 and cross-section areas in the ratio 2:3. If the resistance of wire A be 12 Ω then calculate the resistance of wire B?
Answer» Two wires A and B of the same material have their lengths in the ratio 1:2 and cross-section areas in the ratio 2:3. If the resistance of wire A be 12 $Ω$ then calculate the resistance of wire B?

Discussion

27.	Find the focal length of orginal lens if the two halves of the original lens makes the image of the object O at the same place.
Answer» Find the focal length of orginal lens if the two halves of the original lens makes the image of the object $O$ at the same place.

Discussion

28.	An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What results do you expect? Explain. [3 MARKS]
Answer» An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What results do you expect? Explain. [3 MARKS]

Discussion

29.	Name the levers mentioned in the following passage. Identify the fulcrum, load and effort of each and say which type of lever it is.Ravi and Savita sit on a sea-saw in a garden. In the mean time, a gardener is trimming trees in the garden. He puts the leaves and other garbage in the wheelbarrow. Later, Ravi gets thirsty and he buys lemon sherbet. The sherbet seller cuts the lemon and squeezes it using a lemon squeezer. He puts small pieces of ice in the glass with the help of the tongs
Answer» Name the levers mentioned in the following passage. Identify the fulcrum, load and effort of each and say which type of lever it is. Ravi and Savita sit on a sea-saw in a garden. In the mean time, a gardener is trimming trees in the garden. He puts the leaves and other garbage in the wheelbarrow. Later, Ravi gets thirsty and he buys lemon sherbet. The sherbet seller cuts the lemon and squeezes it using a lemon squeezer. He puts small pieces of ice in the glass with the help of the tongs

Discussion

30.	What is the poetic device used when the mirror says 'I swallow'?
Answer» What is the poetic device used when the mirror says 'I swallow'?

Discussion

31.	Consider a slab of varying RI as shown infigure. If width of slab is very large, then maximum possible y- co-ordinate oflight ray where it will escape: (where yis in meter)
Answer» Consider a slab of varying RI as shown in figure. If width of slab is very large, then maximum possible y- co-ordinate of light ray where it will escape: (where yis in meter)

Discussion

32.	The unit of potential difference is :
Answer» The unit of potential difference is :

Discussion

33.	Sir can you please explain Charles law
Answer» Sir can you please explain Charles law

Discussion

34.	A current carrying wire in the neighborhood produces
Answer» A current carrying wire in the neighborhood produces

Discussion

35.	The sun emits maximum radiation of 0.52 micrometer. Assuming the sun to be a black body, the surface temperature of the sun would be (Wien's constant =2.898×10−3 mK)
Answer» The sun emits maximum radiation of $0.52$ micrometer. Assuming the sun to be a black body, the surface temperature of the sun would be (Wien's constant $= 2.898 \times 10^{- 3} m K$ )

Discussion

36.	35. In an Equilateral triangle ABC two same nature's charge are kept at A and B point.THE potential energy of the system is U.If another same charge is kept(from infinity) in point C then calculate work done?
Answer» 35. In an Equilateral triangle ABC two same nature's charge are kept at A and B point.THE potential energy of the system is U.If another same charge is kept(from infinity) in point C then calculate work done?

Discussion

37.	electric flux across rectangular surface A placed in uniform electric field making angle 60 with its surface is
Answer» electric flux across rectangular surface A placed in uniform electric field making angle 60 with its surface is

Discussion

38.	the wavelength associated with a ball of 200g and moving with a speed of 5m/hour is of the order o
Answer» the wavelength associated with a ball of 200g and moving with a speed of 5m/hour is of the order o

Discussion

39.	If F is the force acting on the particle having position vector r and τ be the torque of this force about the origin then 1) r.τ >0, and F. τ < 0 2) r.τ =0 , F.τ =0 3) r.τ =0, F.τ not equals to 0 4) r.τ not equals 0, F.τ =0
Answer» If F is the force acting on the particle having position vector r and τ be the torque of this force about the origin then 1) r.τ >0, and F. τ < 0 2) r.τ =0 , F.τ =0 3) r.τ =0, F.τ not equals to 0 4) r.τ not equals 0, F.τ =0

Discussion

40.	What is a superconductor? Give one example of it.
Answer» What is a superconductor? Give one example of it.

Discussion

41.	The soft drink bottles are cooled by (i) ice cubes at 0oC, and (ii) Iced-water at 0oC. Which will cool the drink quickly ? Give reason.
Answer» The soft drink bottles are cooled by (i) ice cubes at $0^{o} C$ , and (ii) Iced-water at $0^{o} C$ . Which will cool the drink quickly ? Give reason.

41.

The soft drink bottles are cooled by (i) ice cubes at 0oC, and (ii) Iced-water at 0oC. Which will cool the drink quickly ? Give reason.

Answer»

The soft drink bottles are cooled by (i) ice cubes at $0^{o} C$ , and (ii) Iced-water at $0^{o} C$ . Which will cool the drink quickly ? Give reason.

Discussion

42.	We know light gets scattered when it enters the earth's atmosphere. Why don't then clouds appear blue rather white?
Answer» We know light gets scattered when it enters the earth's atmosphere. Why don't then clouds appear blue rather white?

Discussion

43.	(a) Name an instrument that measures electric current in a circuit. Define the unit of electric current.(b) What do the following symbols mean in circuit diagrams? (i) (ii) (c) An electric circuit consisting of a 0.5 m long nichrome wire XY, an ammeter, a voltmeter, four cells of 1.5 V each and a plug key was set up. (i) Draw a diagram of this electric circuit to study the relation between the potential difference maintained between the points 'X' and 'Y' and the electric current flowing through XY. (ii) Following graph was plotted between V and I values:What would be the values of VI ratios when the potential difference is 0.8 V, 1.2 V and 1.6 V, respectively? What conclusion do you draw from these values?
Answer» (a) Name an instrument that measures electric current in a circuit. Define the unit of electric current. (b) What do the following symbols mean in circuit diagrams? (i) (ii) (c) An electric circuit consisting of a 0.5 m long nichrome wire XY, an ammeter, a voltmeter, four cells of 1.5 V each and a plug key was set up. (i) Draw a diagram of this electric circuit to study the relation between the potential difference maintained between the points 'X' and 'Y' and the electric current flowing through XY. (ii) Following graph was plotted between V and I values: What would be the values of $\frac{V}{I}$ ratios when the potential difference is 0.8 V, 1.2 V and 1.6 V, respectively? What conclusion do you draw from these values?

Discussion

44.	Which of the cables, one rated 5 A and the other 15 A will be of thicker wire? Give a reason for your answer.
Answer» Which of the cables, one rated 5 A and the other 15 A will be of thicker wire? Give a reason for your answer.

44.

Which of the cables, one rated 5 A and the other 15 A will be of thicker wire? Give a reason for your answer.

Answer»

Which of the cables, one rated 5 A and the other 15 A will be of thicker wire? Give a reason for your answer.

Discussion

45.	In the given circuit, when battery supplies 9 V the resistance of the given resistor is R. What will be the resistance of the given resistor (R') when voltage supplied by the battery is 18 V?
Answer» In the given circuit, when battery supplies 9 V the resistance of the given resistor is R. What will be the resistance of the given resistor (R') when voltage supplied by the battery is 18 V?

Discussion

46.	Calculate the escape velocity on the surface of the moon, if the mass and radius of the moon are 7.34×1022kg and 1.74×106m respectively.
Answer» Calculate the escape velocity on the surface of the moon, if the mass and radius of the moon are $7.34 \times 10^{22} k g$ and $1.74 \times 10^{6} m$ respectively.

Discussion

47.	If an object is placed between F1(first focus) and the optical centre of a convex lens, then the image formed will be
Answer» If an object is placed between F1(first focus) and the optical centre of a convex lens, then the image formed will be

Discussion

48.	A lead bullet penetrates into a solid object and melts. Assuming that 50% of its kinetic energy was used to heat it, calculate the initial speed of the bullet. The initial temperature of the bullet is 27∘C and its melting point is 327∘C.Latent heat of fusion of lead =2.5×104 Jkg−1 and specific heat capacity of lead =125 J /kg K.
Answer» A lead bullet penetrates into a solid object and melts. Assuming that $50$ % of its kinetic energy was used to heat it, calculate the initial speed of the bullet. The initial temperature of the bullet is $27^{\circ} C$ and its melting point is $327^{\circ} C$ . Latent heat of fusion of lead $= 2.5 \times 10^{4} J {k g}^{- 1}$ and specific heat capacity of lead $= 125 J /kg K$ .

Discussion

49.	Who coined the word hydrogen which means "water generating"?
Answer» Who coined the word hydrogen which means "water generating"?

Discussion

50.	Calculate the net work done between A and B if potential difference between the points is 50 volts and net charge moved is 50 coulomb.
Answer» Calculate the net work done between A and B if potential difference between the points is 50 volts and net charge moved is 50 coulomb.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

{ Q. }33> An AC circuit contains series combination of }X and }Y and the current is found to be ahead of the voltage }}{ by }π/4 . If element }X is a pure resistor of }100 ohm, identify }Y and find the rms current. }}{ Given that rms voltage is }141 volt.

A puppy is tied by a rope of 20 m long to a point P which is 12 m from a fence as shown in the figure. Pick out the correct inference from the options.

Question 3 (f)State whether the following statement is true or false.​​​​​​​Unwanted or unpleasant sound is termed as music.

A force on 3g particle in such a way that the position of the particle as function of time is given x=3t -4t^{2^{ +t^3,where x is in meters and t is in seconds.The work done during the first 4 second is?

How much heat energy is produced in 10 second in an electric iron having resistance 440 Ω, when a potential difference of 220 volt is applied across it?

If F1 and F2 represents the foci of the lens, then at which point will the light rays meet?

A balloon contains 1.2 L of air at a particular temperature and 90 cm Hg pressure. Keeping the temperature constant if the pressure of air is reduced to 70 cm Hg, then what will be the volume of that air?

Question 6 A stone of 1 kg is thrown with a velocity of 20 ms−1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?

72. d focal lengths of a thin lens for red and violet light r 90.0cm and 86.4 cm respectively.Find d desprsive power of a material of d lens .make appropriate assumptions

Why does the sun appear red at the time of sunset and sunrise? Explain. [3 MARKS]

How rate of reaction depends on activation energy

3) The values of two resistors are R1 = (6 \pm 0.3) kΩ and R2 = (10 \pm 0.2) kΩ. The percentage error in the equivalent resis†an ce when they are connected in parallel is Op

Question 4 (a)How can you as an individual contribute or make a difference to the management of(a) forests and wildlife?

ntLight is incident from glass (RI=1.5) to water (RI=1.33). Find the range of angle of deviation for which there are two angles of incidence.n

During a sunny day, the number plate of a car travelling on the highway seems to flicker for a person walking at a distant in the opposite direction. Why?

Why voltmeter is not connected in series?

3.In the circuit shown, the internal resistance of the cell is negligible. the steady state current in the 2 row resistor is 1. 0.6A. 2. 1.2A 3. 0.9A. 4. 1.5A Hint: remove the branch containing the capacitor along with 4 Ω resistor as there is no current flowing through it.

If current flowed in the circuit from A-B-C-D. Then in which direction did the electron flow happen?

This phenomenon reverberation can be observed in:

A ray of light strikes the surface of a rectangular glass block such that the angle of incidence is 42° , the path taken by the ray in each case as it passes through the glass block and emerges from it is such that

Why are strong magnets around the armature of a motor curved in shape?

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60° is W. Now the torque required to keep the magnet in this new position is

29. The increasing order of specific charge of electron,proton,alpha particle,neutron is

Two wires A and B of the same material have their lengths in the ratio 1:2 and cross-section areas in the ratio 2:3. If the resistance of wire A be 12 Ω then calculate the resistance of wire B?

Find the focal length of orginal lens if the two halves of the original lens makes the image of the object O at the same place.

An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What results do you expect? Explain. [3 MARKS]

What is the poetic device used when the mirror says 'I swallow'?

Consider a slab of varying RI as shown infigure. If width of slab is very large, then maximum possible y- co-ordinate oflight ray where it will escape: (where yis in meter)

The unit of potential difference is :

Sir can you please explain Charles law

A current carrying wire in the neighborhood produces

The sun emits maximum radiation of 0.52 micrometer. Assuming the sun to be a black body, the surface temperature of the sun would be (Wien's constant =2.898×10−3 mK)

35. In an Equilateral triangle ABC two same nature's charge are kept at A and B point.THE potential energy of the system is U.If another same charge is kept(from infinity) in point C then calculate work done?

electric flux across rectangular surface A placed in uniform electric field making angle 60 with its surface is

the wavelength associated with a ball of 200g and moving with a speed of 5m/hour is of the order o

If F is the force acting on the particle having position vector r and τ be the torque of this force about the origin then 1) r.τ >0, and F. τ < 0 2) r.τ =0 , F.τ =0 3) r.τ =0, F.τ not equals to 0 4) r.τ not equals 0, F.τ =0

What is a superconductor? Give one example of it.

The soft drink bottles are cooled by (i) ice cubes at 0oC, and (ii) Iced-water at 0oC. Which will cool the drink quickly ? Give reason.

We know light gets scattered when it enters the earth's atmosphere. Why don't then clouds appear blue rather white?

Which of the cables, one rated 5 A and the other 15 A will be of thicker wire? Give a reason for your answer.

In the given circuit, when battery supplies 9 V the resistance of the given resistor is R. What will be the resistance of the given resistor (R') when voltage supplied by the battery is 18 V?

Calculate the escape velocity on the surface of the moon, if the mass and radius of the moon are 7.34×1022kg and 1.74×106m respectively.

If an object is placed between F1(first focus) and the optical centre of a convex lens, then the image formed will be

Who coined the word hydrogen which means "water generating"?

Calculate the net work done between A and B if potential difference between the points is 50 volts and net charge moved is 50 coulomb.

Question 3 (f)State whether the following statement is true or false.Unwanted or unpleasant sound is termed as music.