16569 + Interview Questions in Physics

1.	which one is true , either ' one coulomb of charge = 6.25 × 10^{18} ' or ' one coulomb of negative charge = 6.25 × 10^{18} '
Answer» which one is true , either ' one coulomb of charge = 6.25 × 10^{18} ' or ' one coulomb of negative charge = 6.25 × 10^{18} '

Discussion

2.	Select the correct statements from the following. (i) Wind energy is renewable source of energy. (ii) Installation cost of wind mill is low. (iii) Wind mills are generally installed in populated areas. (iv) Energy produced from wind mills is non-polluting.
Answer» Select the correct statements from the following. (i) Wind energy is renewable source of energy. (ii) Installation cost of wind mill is low. (iii) Wind mills are generally installed in populated areas. (iv) Energy produced from wind mills is non-polluting.

2.

Select the correct statements from the following. (i) Wind energy is renewable source of energy. (ii) Installation cost of wind mill is low. (iii) Wind mills are generally installed in populated areas. (iv) Energy produced from wind mills is non-polluting.

Answer»

Select the correct statements from the following.

(i) Wind energy is renewable source of energy.

(ii) Installation cost of wind mill is low.

(iii) Wind mills are generally installed in populated areas.

(iv) Energy produced from wind mills is non-polluting.

Discussion

3.	The wavelength range of the visible spectrum extends from violet(400nm) to red (750nm). Express these wavelengths in frequencies (Hz).(1nm=10^-9m).
Answer» The wavelength range of the visible spectrum extends from violet(400nm) to red (750nm). Express these wavelengths in frequencies (Hz).(1nm=10^-9m).

Discussion

4.	An arc of radius 6 m subtends an angle 120∘ at the centre. If an ant travels on the arc from one end to another end in 4 sec, what will be the magnitude of average velocity of the ant ?
Answer» An arc of radius $6 m$ subtends an angle $120^{\circ}$ at the centre. If an ant travels on the arc from one end to another end in $4 sec$ , what will be the magnitude of average velocity of the ant ?

Discussion

5.	Which of the following property of a proton can change while it moves freely in a magnetic field?
Answer» Which of the following property of a proton can change while it moves freely in a magnetic field?

Discussion

6.	At room temperature (27.0∘C) the resistance of a heating element is 100 Ω. Calculate the temperature of the element if the resistance is found to be 117 Ω (the temperature coefficient of resistance of the material is 1.7×10−4 ∘C−1)
Answer» At room temperature $({27.0}^{\circ} C)$ the resistance of a heating element is $100 Ω$ . Calculate the temperature of the element if the resistance is found to be $117 Ω$ (the temperature coefficient of resistance of the material is $1.7 \times 10^{- 4}$ $^{\circ} C^{- 1}$ )

Discussion

7.	What is near point ?
Answer» What is near point ?

Discussion

8.	A ball is thrown vertically upwards which attains a maximum height of 20 m. Calculate the velocity with which the ball is thrown upwards? (Take g=9.8 m s−2)
Answer» A ball is thrown vertically upwards which attains a maximum height of $20 m$ . Calculate the velocity with which the ball is thrown upwards? (Take $g = 9.8 m s^{- 2}$ )

Discussion

9.	Disadvantage of geothermal energy
Answer» Disadvantage of geothermal energy

Discussion

10.	15.Power Dissipated in an LCR series circuit connected to an a.c. source of emf E is ?
Answer» 15.Power Dissipated in an LCR series circuit connected to an a.c. source of emf E is ?

Discussion

11.	A circular loop of radius R is bent along a diameter and given a shape as shown in the figure. One of the semicircles KNM lies in the x-z plane and the other one KLM in the y-z plane with their centres at the origin. Current I is flowing through each of the semicircles as shown in figure. If an external uniform magnetic field B^j is applied, determine the forces F1 and F2 on the semicircles KLM and KNM due to the field and the net force F on the loop.
Answer» A circular loop of radius $R$ is bent along a diameter and given a shape as shown in the figure. One of the semicircles $KNM$ lies in the $x-z$ plane and the other one $KLM$ in the $y-z$ plane with their centres at the origin. Current $I$ is flowing through each of the semicircles as shown in figure. If an external uniform magnetic field $B^j$ is applied, determine the forces $F_{1}$ and $F_{2}$ on the semicircles $KLM$ and $KNM$ due to the field and the net force $F$ on the loop.

Discussion

12.	The critical angle for light going from medium x into medium y is θ. The speed of light in medium x is v. The speed of light in medium y is :
Answer» The critical angle for light going from medium $x$ into medium $y$ is $θ$ . The speed of light in medium $x$ is $v$ . The speed of light in medium $y$ is :

Discussion

13.	When should we take the value of g as negative and when should it be taken as positive,or is the value of g always negative?
Answer» When should we take the value of g as negative and when should it be taken as positive,or is the value of g always negative?

Discussion

14.	We know that light gets scattered when it enters the earth's atmosphere. The why don’t clouds appear blue instead of white?
Answer» We know that light gets scattered when it enters the earth's atmosphere. The why don’t clouds appear blue instead of white?

Discussion

15.	a particle is projected with a speed of 10root2 ms-1 and at an angle of 45 degree with the horizontal the rate of change of speed with respect to time at t=1?
Answer» a particle is projected with a speed of 10root2 ms-1 and at an angle of 45 degree with the horizontal the rate of change of speed with respect to time at t=1?

Discussion

16.	18. 27 g Al (at. Mass = 27) will react completely with oxygen equal to?
Answer» 18. 27 g Al (at. Mass = 27) will react completely with oxygen equal to?

Discussion

17.	A current carrying conductor having a length of 1 mm produces a magnetic field of 5×10−12 T at the point P. The value of current flowing in the conductor is 10 A and the distance between the conductor and the point P is 1 m. Find the angle between the length vector of conductor and the position vector of the point P.
Answer» A current carrying conductor having a length of $1 mm$ produces a magnetic field of $5 \times 10^{- 12} T$ at the point $P$ . The value of current flowing in the conductor is $10 A$ and the distance between the conductor and the point $P$ is $1 m$ . Find the angle between the length vector of conductor and the position vector of the point $P$ .

Discussion

18.	What are Conventional sources of energy?
Answer» What are Conventional sources of energy?

Discussion

19.	Answer the following questions in about 30 words.(i)What is biodiversity? Why is biodiversity important for human lives?(ii)How have human activities affected the depletion of flora and fauna?Explain.
Answer» Answer the following questions in about 30 words. (i)What is biodiversity? Why is biodiversity important for human lives? (ii)How have human activities affected the depletion of flora and fauna?Explain.

19.

Answer the following questions in about 30 words.(i)What is biodiversity? Why is biodiversity important for human lives?(ii)How have human activities affected the depletion of flora and fauna?Explain.

Answer»

Answer the following questions in about 30 words.

(i)What is biodiversity? Why is biodiversity important for human lives?

(ii)How have human activities affected the depletion of flora and fauna?Explain.

Discussion

20.	The major problem in harnessing nuclear energy is :
Answer» The major problem in harnessing nuclear energy is :

Discussion

21.	I'hA 30 m deep well is having water upto 15 m. Anengine evacuates it in one hour. The power of the10engine, if the diameter of the well is 4 m is
Answer» I'hA 30 m deep well is having water upto 15 m. Anengine evacuates it in one hour. The power of the10engine, if the diameter of the well is 4 m is

Discussion

22.	A body of mass 1 kg falls from a height of 5 m. How much energy does it possess at any instant? (Take g=9.8 m/s2)
Answer» A body of mass 1 kg falls from a height of 5 m. How much energy does it possess at any instant? $(Take g = 9.8 m / s^{2})$

Discussion

23.	86.Two parallel long wires carrying current i1 and i2 with i1> 12 . When th currents are in the same direction , then the magnetic field at a point midway b/w the wires is 10 micro T. If the direction of i2 is reversed then the field becomes 30 micro T . THE ratio of currents will be a) 4 b) 3 c)2 d) 1
Answer» 86.Two parallel long wires carrying current i1 and i2 with i1> 12 . When th currents are in the same direction , then the magnetic field at a point midway b/w the wires is 10 micro T. If the direction of i2 is reversed then the field becomes 30 micro T . THE ratio of currents will be a) 4 b) 3 c)2 d) 1

Discussion

24.	The change in focal length of an eye lens is caused by the action of the –
Answer» The change in focal length of an eye lens is caused by the action of the –

Discussion

25.	Series CombinationIf there was no R1 resistance then current I would not have been opposed by R1, that is almost 0 resistance would be on that particular spot.But now since R1 is present, the resistance at that place has increased from almost 0 to some greater value.According to Ohm's law, 1/I=R or if resistance increases, current would decrease.Thus the current passing through R2 resistance would be lesser than I, and the current passing through R3 resistance would be lesser than that passing through R2.But, why is it said that the same current(I) is passing through each of these three resistances.
Answer» Series Combination If there was no R1 resistance then current I would not have been opposed by R1, that is almost 0 resistance would be on that particular spot. But now since R1 is present, the resistance at that place has increased from almost 0 to some greater value. According to Ohm's law, 1/I=R or if resistance increases, current would decrease. Thus the current passing through R2 resistance would be lesser than I, and the current passing through R3 resistance would be lesser than that passing through R2. But, why is it said that the same current(I) is passing through each of these three resistances.

Discussion

26.	Important precaution that should be taken while handling radioactive materials are
Answer» Important precaution that should be taken while handling radioactive materials are

Discussion

27.	A spaceship covers a distance of 4×104 km. What is the rate of fuel comsumption if the spaceship consumes 4.4×105 L of fuel?
Answer» A spaceship covers a distance of $4 \times 10^{4}$ km. What is the rate of fuel comsumption if the spaceship consumes $4.4 \times 10^{5}$ L of fuel?

Discussion

28.	A 5V battery with internal resistance 1 ohm and a 2V battery with internal resistance 0.5 ohm are connected to a 3 ohm resistor as shown in the figure the current in the 3 ohm resistor is
Answer» A 5V battery with internal resistance 1 ohm and a 2V battery with internal resistance 0.5 ohm are connected to a 3 ohm resistor as shown in the figure the current in the 3 ohm resistor is

Discussion

29.	An image which can be obtained on a screen is known as _____.
Answer» An image which can be obtained on a screen is known as _____.

Discussion

30.	Which of the following correctly describes the magnetic field lines near a long straight wire?
Answer» Which of the following correctly describes the magnetic field lines near a long straight wire?

Discussion

31.	An electric bulb of resistance 500Ω draws current 0.4 A from the source. Calculate: (a) the power of bulb and (b) the potential difference at its end.
Answer» An electric bulb of resistance $500 Ω$ draws current 0.4 A from the source. Calculate: (a) the power of bulb and (b) the potential difference at its end.

Discussion

32.	170 A wire of fixed length is wound on a solenoid of length l and radius r. Its self inductance is found to be L. Now if same wire is wound on a solenoid of length l/2 and radius r/2,then self inductance will be 1- 2L 2- L/2 3- 3L 4- 4L
Answer» 170 A wire of fixed length is wound on a solenoid of length l and radius r. Its self inductance is found to be L. Now if same wire is wound on a solenoid of length l/2 and radius r/2,then self inductance will be 1- 2L 2- L/2 3- 3L 4- 4L

Discussion

33.	An object is placed at 10 cm from a convex mirror of focal length 10 cm. Find the position of the image
Answer» An object is placed at 10 cm from a convex mirror of focal length 10 cm. Find the position of the image

Discussion

34.	Question 29 (b) Three incandescent bulbs of 100 W each are connected in series in an electric circuit. In another circuit, another set of three bulbs of the same wattage are connected in parallel to the same source. (b) Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason.
Answer» Question 29 (b) Three incandescent bulbs of 100 W each are connected in series in an electric circuit. In another circuit, another set of three bulbs of the same wattage are connected in parallel to the same source. (b) Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason.

Discussion

35.	4. The resistance of solution A is 100 ohm and resistance of solution B is 200 ohm in same conductivity cell. Equal volume of solution A and B are mixed and taken in same cell. The resistance of mixture is (1) 133.33 ohm (2) 166.66 ohm (3) 150 ohm (4) 175 ohm
Answer» 4. The resistance of solution A is 100 ohm and resistance of solution B is 200 ohm in same conductivity cell. Equal volume of solution A and B are mixed and taken in same cell. The resistance of mixture is (1) 133.33 ohm (2) 166.66 ohm (3) 150 ohm (4) 175 ohm

Discussion

36.	We plot the density of water as we heat a sample of ice till it melts, and keep increasing the temperature. Which of these statements is/are incorrect?
Answer» We plot the density of water as we heat a sample of ice till it melts, and keep increasing the temperature. Which of these statements is/are incorrect?

36.

We plot the density of water as we heat a sample of ice till it melts, and keep increasing the temperature. Which of these statements is/are incorrect?

Answer»

We plot the density of water as we heat a sample of ice till it melts, and keep increasing the temperature. Which of these statements is/are incorrect?

Discussion

37.	Question 7 An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?
Answer» Question 7 An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?

Discussion

38.	Pick the correct word for the waste management technique based on the following figures:
Answer» Pick the correct word for the waste management technique based on the following figures:

Discussion

39.	What is tyndall effect ? Explain with an example.
Answer» What is tyndall effect ? Explain with an example.

Discussion

40.	The refractive indices of four materials A, B, C and D are 1.33, 1.43, 1.71 and 1.52 respectively. When the light rays pass from air into these materials, they refract the maximum in : (a) material A (b) material B (c) material C (d) material D
Answer» The refractive indices of four materials A, B, C and D are 1.33, 1.43, 1.71 and 1.52 respectively. When the light rays pass from air into these materials, they refract the maximum in : (a) material A (b) material B (c) material C (d) material D

Discussion

41.	ntnttntttntttt ntttttA capacitor of capacitance 160 μF is charged to a potential difference of 200 volt & then connected across the discharged tube which conducts until the potential difference across it has fallen to 100 volt. The energy dissipated in the tube is :-ntttnttntnn ntnttntttnttttnttttt(1)nttttnttttt6.4 Jntttntttnttttnttttt(2)nttttnttttt4.8 Jntttntttnttttnttttt(3)nttttnttttt4.2 Jntttntttnttttnttttt(4)nttttnttttt2.4 Jntttnttntnn ntn
Answer» ntnttntttntttt ntttttA capacitor of capacitance 160 μF is charged to a potential difference of 200 volt & then connected across the discharged tube which conducts until the potential difference across it has fallen to 100 volt. The energy dissipated in the tube is :-ntttnttntnn ntnttntttnttttnttttt(1)nttttnttttt6.4 Jntttntttnttttnttttt(2)nttttnttttt4.8 Jntttntttnttttnttttt(3)nttttnttttt4.2 Jntttntttnttttnttttt(4)nttttnttttt2.4 Jntttnttntnn ntn

Discussion

42.	does adding salt to ice decreases its melting point?
Answer» does adding salt to ice decreases its melting point?

Discussion

43.	Study the following four experimental set-ups I, II, III and IV for the experiment, "To trace the path of a ray of light through a rectangular glass slab." Which of the marked set-ups is likely to give best results (P1 and P2 are the positions of pins fixed on the incident ray)?
Answer» Study the following four experimental set-ups I, II, III and IV for the experiment, "To trace the path of a ray of light through a rectangular glass slab." Which of the marked set-ups is likely to give best results ( $P_{1}$ and $P_{2}$ are the positions of pins fixed on the incident ray)?

43.

Study the following four experimental set-ups I, II, III and IV for the experiment, "To trace the path of a ray of light through a rectangular glass slab." Which of the marked set-ups is likely to give best results (P1 and P2 are the positions of pins fixed on the incident ray)?

Answer»

Study the following four experimental set-ups I, II, III and IV for the experiment, "To trace the path of a ray of light through a rectangular glass slab."

Which of the marked set-ups is likely to give best results ( $P_{1}$ and $P_{2}$ are the positions of pins fixed on the incident ray)?

Discussion

44.	64.Effective resistance between points A nd B for following network is :- (each branch of resistance R)
Answer» 64.Effective resistance between points A nd B for following network is :- (each branch of resistance R)

Discussion

45.	A wire, bent into a circle, carries a current in an anticlockwise direction. What polarity does this face of the coil exhibit ?
Answer» A wire, bent into a circle, carries a current in an anticlockwise direction. What polarity does this face of the coil exhibit ?

Discussion

46.	Write the full names of (a) CFL, and (b) CFC.
Answer» Write the full names of (a) CFL, and (b) CFC.

Discussion

47.	38. A dilute aqueous solution at Na2SO4 is electrolysed using platinum electrodes.the products at anode and cathode are
Answer» 38. A dilute aqueous solution at Na2SO4 is electrolysed using platinum electrodes.the products at anode and cathode are

Discussion

48.	if the magnetic flux linked with a coil through which a current of x A is set up is y wb, then the coefficient of self inductance of the coil is?
Answer» if the magnetic flux linked with a coil through which a current of x A is set up is y wb, then the coefficient of self inductance of the coil is?

Discussion

49.	Question 28What measures would you take to conserve electricity in your house?
Answer» Question 28 What measures would you take to conserve electricity in your house?

Discussion

50.	A bird perches on a power line that carries a current of 160 A. Calculate the potential difference between the bird's feet if the resistance of the wire is 10μΩm−1 and the bird's feet are 4 cm apart?
Answer» A bird perches on a power line that carries a current of 160 A. Calculate the potential difference between the bird's feet if the resistance of the wire is $10 μ Ω m^{- 1}$ and the bird's feet are 4 cm apart?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

which one is true , either ' one coulomb of charge = 6.25 × 10^{18} ' or ' one coulomb of negative charge = 6.25 × 10^{18} '

Select the correct statements from the following. (i) Wind energy is renewable source of energy. (ii) Installation cost of wind mill is low. (iii) Wind mills are generally installed in populated areas. (iv) Energy produced from wind mills is non-polluting.

The wavelength range of the visible spectrum extends from violet(400nm) to red (750nm). Express these wavelengths in frequencies (Hz).(1nm=10^-9m).

An arc of radius 6 m subtends an angle 120∘ at the centre. If an ant travels on the arc from one end to another end in 4 sec, what will be the magnitude of average velocity of the ant ?

Which of the following property of a proton can change while it moves freely in a magnetic field?

At room temperature (27.0∘C) the resistance of a heating element is 100 Ω. Calculate the temperature of the element if the resistance is found to be 117 Ω (the temperature coefficient of resistance of the material is 1.7×10−4 ∘C−1)

What is near point ?

A ball is thrown vertically upwards which attains a maximum height of 20 m. Calculate the velocity with which the ball is thrown upwards? (Take g=9.8 m s−2)

Disadvantage of geothermal energy

15.Power Dissipated in an LCR series circuit connected to an a.c. source of emf E is ?

The critical angle for light going from medium x into medium y is θ. The speed of light in medium x is v. The speed of light in medium y is :

When should we take the value of g as negative and when should it be taken as positive,or is the value of g always negative?

We know that light gets scattered when it enters the earth's atmosphere. The why don’t clouds appear blue instead of white?

a particle is projected with a speed of 10root2 ms-1 and at an angle of 45 degree with the horizontal the rate of change of speed with respect to time at t=1?

18. 27 g Al (at. Mass = 27) will react completely with oxygen equal to?

What are Conventional sources of energy?

Answer the following questions in about 30 words.(i)What is biodiversity? Why is biodiversity important for human lives?(ii)How have human activities affected the depletion of flora and fauna?Explain.

The major problem in harnessing nuclear energy is :

I'hA 30 m deep well is having water upto 15 m. Anengine evacuates it in one hour. The power of the10engine, if the diameter of the well is 4 m is

A body of mass 1 kg falls from a height of 5 m. How much energy does it possess at any instant? (Take g=9.8 m/s2)

The change in focal length of an eye lens is caused by the action of the –

Important precaution that should be taken while handling radioactive materials are

A spaceship covers a distance of 4×104 km. What is the rate of fuel comsumption if the spaceship consumes 4.4×105 L of fuel?

A 5V battery with internal resistance 1 ohm and a 2V battery with internal resistance 0.5 ohm are connected to a 3 ohm resistor as shown in the figure the current in the 3 ohm resistor is

An image which can be obtained on a screen is known as _____.

Which of the following correctly describes the magnetic field lines near a long straight wire?

An electric bulb of resistance 500Ω draws current 0.4 A from the source. Calculate: (a) the power of bulb and (b) the potential difference at its end.

170 A wire of fixed length is wound on a solenoid of length l and radius r. Its self inductance is found to be L. Now if same wire is wound on a solenoid of length l/2 and radius r/2,then self inductance will be 1- 2L 2- L/2 3- 3L 4- 4L

An object is placed at 10 cm from a convex mirror of focal length 10 cm. Find the position of the image

4. The resistance of solution A is 100 ohm and resistance of solution B is 200 ohm in same conductivity cell. Equal volume of solution A and B are mixed and taken in same cell. The resistance of mixture is (1) 133.33 ohm (2) 166.66 ohm (3) 150 ohm (4) 175 ohm

We plot the density of water as we heat a sample of ice till it melts, and keep increasing the temperature. Which of these statements is/are incorrect?

Question 7 An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?

Pick the correct word for the waste management technique based on the following figures:

What is tyndall effect ? Explain with an example.

The refractive indices of four materials A, B, C and D are 1.33, 1.43, 1.71 and 1.52 respectively. When the light rays pass from air into these materials, they refract the maximum in : (a) material A (b) material B (c) material C (d) material D

does adding salt to ice decreases its melting point?

Study the following four experimental set-ups I, II, III and IV for the experiment, "To trace the path of a ray of light through a rectangular glass slab." Which of the marked set-ups is likely to give best results (P1 and P2 are the positions of pins fixed on the incident ray)?

64.Effective resistance between points A nd B for following network is :- (each branch of resistance R)

A wire, bent into a circle, carries a current in an anticlockwise direction. What polarity does this face of the coil exhibit ?

Write the full names of (a) CFL, and (b) CFC.

38. A dilute aqueous solution at Na2SO4 is electrolysed using platinum electrodes.the products at anode and cathode are

if the magnetic flux linked with a coil through which a current of x A is set up is y wb, then the coefficient of self inductance of the coil is?

Question 28What measures would you take to conserve electricity in your house?

A bird perches on a power line that carries a current of 160 A. Calculate the potential difference between the bird's feet if the resistance of the wire is 10μΩm−1 and the bird's feet are 4 cm apart?