16569 + Interview Questions in Physics

1.	A LENS IS PLACED BETWEEN A SOURCE AND A SCREEN.IT FORMS IMAGES OF AREA A_1 AND A_{2 } FOR TWI DIFFERENT POSITIONS.THE AREA OF THE SOURCE OF LIGHT I
Answer» A LENS IS PLACED BETWEEN A SOURCE AND A SCREEN.IT FORMS IMAGES OF AREA A_1 AND A_{2 } FOR TWI DIFFERENT POSITIONS.THE AREA OF THE SOURCE OF LIGHT I

Discussion

2.	A wheel has angular acceleration of 3.0rad/sec² and angular speed od 2.00rad/sec in a time of 2sec it has rotated through an angle
Answer» A wheel has angular acceleration of 3.0rad/sec² and angular speed od 2.00rad/sec in a time of 2sec it has rotated through an angle

Discussion

3.	Calculate the current flowing through 1.5 kW-250 V electric heater.
Answer» Calculate the current flowing through 1.5 kW-250 V electric heater.

Discussion

4.	17.A nucleus of 84Po210 originally at rest emit alpha with speed v . Recoil speed of daughter nucleus is
Answer» 17.A nucleus of 84Po210 originally at rest emit alpha with speed v . Recoil speed of daughter nucleus is

Discussion

5.	The human eye can be regarded as a single spherical refractive surface having curvature of cornea 7.8 mm. If a parallel beam of light comes to focus at 3.075 cm behind the refractive surface, the refractive index of the eye is
Answer» The human eye can be regarded as a single spherical refractive surface having curvature of cornea $7.8 mm$ . If a parallel beam of light comes to focus at $3.075 cm$ behind the refractive surface, the refractive index of the eye is

Discussion

6.	What is frequency of alternate current in India
Answer» What is frequency of alternate current in India

Discussion

7.	Q. A long solenoid has 200 turns per cm and carries a current I . The magnetic field at the centre is 6.28\ast10^{-2}Wbm^{-2}.Another long solenoid has 100 turns per cm and it carries a current I/3. The value of magnetic field at its centre is?
Answer» Q. A long solenoid has 200 turns per cm and carries a current I . The magnetic field at the centre is 6.28\ast10^{-2}Wbm^{-2}.Another long solenoid has 100 turns per cm and it carries a current I/3. The value of magnetic field at its centre is?

Discussion

8.	What is meant by scattering of light?
Answer» What is meant by scattering of light?

Discussion

9.	What is the nature of image formed by a concave mirror if the magnification produced by the mirror is (a) + 4, and (b) - 2 ?
Answer» What is the nature of image formed by a concave mirror if the magnification produced by the mirror is (a) + 4, and (b) - 2 ?

Discussion

10.	Question 17How are we able to see nearby and also the distant objects clearly?
Answer» Question 17 How are we able to see nearby and also the distant objects clearly?

Discussion

11.	What is the relation between the incident ray on a glass slab and the emergent ray?
Answer» What is the relation between the incident ray on a glass slab and the emergent ray?

Discussion

12.	17. Find the equivalent capacitance with refrence to given figure if each capacitor has capacitance of 4microfarad?
Answer» 17. Find the equivalent capacitance with refrence to given figure if each capacitor has capacitance of 4microfarad?

Discussion

13.	Which of the following instruments uses the phenomenon of induced EMF?
Answer» Which of the following instruments uses the phenomenon of induced EMF?

Discussion

14.	A coil of wire of 1000 turns has self inductance 120 millinery. What is the self inductance of a coil of 250 turns?
Answer» A coil of wire of 1000 turns has self inductance 120 millinery. What is the self inductance of a coil of 250 turns?

Discussion

15.	Professor Photon is a scientist. He is designing a rocket to take him to the sun. His colleague Professor Spark tells him that he and the rocket will burn out when they reach near the sun. Professor Photon has an answer to this - he says that he will launch the rocket so that it reaches the sun during a total solar eclipse.Is Professor Photon's logic correct? Give reason.
Answer» Professor Photon is a scientist. He is designing a rocket to take him to the sun. His colleague Professor Spark tells him that he and the rocket will burn out when they reach near the sun. Professor Photon has an answer to this - he says that he will launch the rocket so that it reaches the sun during a total solar eclipse. Is Professor Photon's logic correct? Give reason.

Discussion

16.	State giving reasons, whethere the following nuclear disintegrations allowed or not (star indicates an excited state). [2 MARKS] (a) AZX∗→AZX+γ (b) AZX→AZ−2X+42He
Answer» State giving reasons, whethere the following nuclear disintegrations allowed or not (star indicates an excited state). [2 MARKS] (a) $_{Z}^{A} X^{*} \to_{Z}^{A} X + γ$ (b) $_{Z}^{A} X \to_{Z - 2}^{A} X +_{2}^{4} H e$

16.

State giving reasons, whethere the following nuclear disintegrations allowed or not (star indicates an excited state). [2 MARKS] (a) AZX∗→AZX+γ (b) AZX→AZ−2X+42He

Answer»

State giving reasons, whethere the following nuclear disintegrations allowed or not (star indicates an excited state). [2 MARKS]
(a) $_{Z}^{A} X^{*} \to_{Z}^{A} X + γ$
(b) $_{Z}^{A} X \to_{Z - 2}^{A} X +_{2}^{4} H e$

Discussion

17.	The velocity of light in two different media are 2×108 ms−1 and 2.5×108 ms−1 respectively. The critical angle for these media is
Answer» The velocity of light in two different media are $2 \times 10^{8} {ms}^{- 1}$ and $2.5 \times 10^{8} {ms}^{- 1}$ respectively. The critical angle for these media is

Discussion

18.	which has least polarity H-F O-H C-H N-H explain ?
Answer» which has least polarity H-F O-H C-H N-H explain ?

Discussion

19.	Question 25Explain the structure and functioning of human eye. How are we able to see nearby as well as distant objects?
Answer» Question 25 Explain the structure and functioning of human eye. How are we able to see nearby as well as distant objects?

Discussion

20.	A current 2.0 A is passed for 5 hours through a moltenmetal salt deposits 22 g of metal (At. wt. 177), theoxidation state of the metal in the metal salt is:(a) +1(c) +3(b) +2(d) +4
Answer» A current 2.0 A is passed for 5 hours through a moltenmetal salt deposits 22 g of metal (At. wt. 177), theoxidation state of the metal in the metal salt is:(a) +1(c) +3(b) +2(d) +4

Discussion

21.	What is the relationship between magnification and focal length of spherical mirror?
Answer» What is the relationship between magnification and focal length of spherical mirror?

Discussion

22.	For 0
Answer» For 0

Discussion

23.	Estimate the charge on 26 gm of Na+
Answer» Estimate the charge on 26 gm of Na+

Discussion

24.	Question 22 A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent, if instead of water we use liquids like, kerosene or turpentine? Support your answer with reason.
Answer» Question 22 A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent, if instead of water we use liquids like, kerosene or turpentine? Support your answer with reason.

Discussion

25.	A square loop of side 2a and carrying current I is kept in x−z plane with its centre at origin. A long wire carrying the same current I is placed parallel to z− axis and passing through point (0,b,0), (b>>a). The magnitude of torque on the loop about z− axis will be :
Answer» A square loop of side $2 a$ and carrying current $I$ is kept in $x - z$ plane with its centre at origin. A long wire carrying the same current $I$ is placed parallel to $z -$ axis and passing through point $(0, b, 0), (b >> a)$ . The magnitude of torque on the loop about $z -$ axis will be :

Discussion

26.	Final image of a point source O placed at the bottom of the container filled with water in it is formed at 25 cm below the water level as shown in the figure. Focal length of the mirror (in cm) is
Answer» Final image of a point source $O$ placed at the bottom of the container filled with water in it is formed at $25 cm$ below the water level as shown in the figure. Focal length of the mirror (in $cm$ ) is

Discussion

27.	11. If the gravitational potential due to the earth on itssurface is assumed to be zero, then gravitationalpotential at height 2R from surface will beRadius of the earth; g: acceleration due to(Rgravity on earth surface)GMmgRegRe(2)3(1)2gRe(3)32gRg(4)R23
Answer» 11. If the gravitational potential due to the earth on itssurface is assumed to be zero, then gravitationalpotential at height 2R from surface will beRadius of the earth; g: acceleration due to(Rgravity on earth surface)GMmgRegRe(2)3(1)2gRe(3)32gRg(4)R23

Discussion

28.	A mirror forms an image which is 30 cm from an object and twice its height. (a) Where must the mirror be situated? (b) What is the radius of curvature? (c) Is the mirror convex or concave?
Answer» A mirror forms an image which is 30 cm from an object and twice its height. (a) Where must the mirror be situated? (b) What is the radius of curvature? (c) Is the mirror convex or concave?

28.

A mirror forms an image which is 30 cm from an object and twice its height. (a) Where must the mirror be situated? (b) What is the radius of curvature? (c) Is the mirror convex or concave?

Answer»

A mirror forms an image which is 30 cm from an object and twice its height.

(a) Where must the mirror be situated?

(b) What is the radius of curvature?

(c) Is the mirror convex or concave?

Discussion

29.	Resistance of n resistors each of r Ω, when connected in parallel give an equivalent resistance of R Ω. If these resistance's were connected in series, the combination would have a resistance in Ω, equal to
Answer» Resistance of $n$ resistors each of $r Ω$ , when connected in parallel give an equivalent resistance of $R Ω$ . If these resistance's were connected in series, the combination would have a resistance in $Ω$ , equal to

Discussion

30.	What is the use of a kink in a clinical thermometer? Write the steps to measure the body temperature with a clinical thermometer?
Answer» What is the use of a kink in a clinical thermometer? Write the steps to measure the body temperature with a clinical thermometer?

Discussion

31.	short distance travelled by particle exclusive SHM from the mean position in 2 second is equal to root 3 by 2 time its amplitude determine the time period
Answer» short distance travelled by particle exclusive SHM from the mean position in 2 second is equal to root 3 by 2 time its amplitude determine the time period

Discussion

32.	A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross-section, what will be its new resistance?
Answer» A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross-section, what will be its new resistance?

Discussion

33.	Question 18 Using second law of motion, derive the relation between force and acceleration. A bullet of 10 g strikes sand-bag at a speed of 103 ms−1 and gets embedded after travelling 5 cm. Calculate (i) the resistive force exerted by the sand on the bullet (ii) the time taken by the bullet to come
Answer» Question 18 Using second law of motion, derive the relation between force and acceleration. A bullet of 10 g strikes sand-bag at a speed of $10^{3} m s^{- 1}$ and gets embedded after travelling 5 cm. Calculate (i) the resistive force exerted by the sand on the bullet (ii) the time taken by the bullet to come

Discussion

34.	Calculate the image distance for an object of height 12 mm at a distance of 0.20 m from a concave lens of focal length 0.30 m, and state the nature and size of the image.
Answer» Calculate the image distance for an object of height 12 mm at a distance of 0.20 m from a concave lens of focal length 0.30 m, and state the nature and size of the image.

Discussion

35.	1 electron volt per second is equal to:[1 mark]
Answer» 1 electron volt per second is equal to: [1 mark]

Discussion

36.	How do moving charges create a magnetic field?
Answer» How do moving charges create a magnetic field?

Discussion

37.	65.A tangen galvanometer has 80 turns of wire,The internal and external diameter of the coil are 19 cm and 21 cm respectively.The reduction factor of the galvanometer at a place where H= 0.32 oersted will be
Answer» 65.A tangen galvanometer has 80 turns of wire,The internal and external diameter of the coil are 19 cm and 21 cm respectively.The reduction factor of the galvanometer at a place where H= 0.32 oersted will be

Discussion

38.	a 4 dioptre lens is used as magnifying glass where should object be placed to obtain maximum angular magnification for normal eye?
Answer» a 4 dioptre lens is used as magnifying glass where should object be placed to obtain maximum angular magnification for normal eye?

Discussion

39.	Explain the sign convention for spherical mirrors.
Answer» Explain the sign convention for spherical mirrors.

Discussion

40.	45. Effect of wavelength on focal length of a mirror and lens
Answer» 45. Effect of wavelength on focal length of a mirror and lens

Discussion

41.	An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What is the power of the bulb?
Answer» An electric bulb consumes $7.2 kJ$ of electrical energy in $2$ minutes. What is the power of the bulb?

Discussion

42.	When two different stones of masses 1 kg and 2 kg are taken to the same heights, then:
Answer» When two different stones of masses $1 kg$ and $2 kg$ are taken to the same heights, then:

Discussion

43.	Two identical fuses are rated at 10A. If they are joined (A) in parallel, the combination acts as a fuse of rating 20A (B) in parallel, the combination acts as a fuse of rating 5A (C) in series, the combination acts as a fuse of rating 10A (D) in series, the combination acts as a fuse of rating 20A
Answer» Two identical fuses are rated at 10A. If they are joined (A) in parallel, the combination acts as a fuse of rating 20A (B) in parallel, the combination acts as a fuse of rating 5A (C) in series, the combination acts as a fuse of rating 10A (D) in series, the combination acts as a fuse of rating 20A

Discussion

44.	Thermoelectric thermometer is based on
Answer» Thermoelectric thermometer is based on

44.

Thermoelectric thermometer is based on

Answer»

Thermoelectric thermometer is based on

Discussion

45.	A uniform metre scale is kept in equilibrium. It is supported at 60 cm mark and a mass M is suspended at 90 cm mark as shown in the figure. What is the relation between the weight of the scale(W) and the weight of mass(M)?
Answer» A uniform metre scale is kept in equilibrium. It is supported at 60 cm mark and a mass M is suspended at 90 cm mark as shown in the figure. What is the relation between the weight of the scale(W) and the weight of mass(M)?

45.

A uniform metre scale is kept in equilibrium. It is supported at 60 cm mark and a mass M is suspended at 90 cm mark as shown in the figure. What is the relation between the weight of the scale(W) and the weight of mass(M)?

Answer»

A uniform metre scale is kept in equilibrium. It is supported at 60 cm mark and a mass M is suspended at 90 cm mark as shown in the figure. What is the relation between the weight of the scale(W) and the weight of mass(M)?

Discussion

46.	What is bicycle dynamo
Answer» What is bicycle dynamo

Discussion

47.	A voltage v=166sin314t+20sin942t V is applied to the primary of a transformer. If the transformer has 100 turns in the primary, the rms value of the core flux in mWb is ________.3.7
Answer» A voltage $v = 166 sin 314 t + 20 sin 942 t V$ is applied to the primary of a transformer. If the transformer has 100 turns in the primary, the rms value of the core flux in mWb is ________. 3.7

Discussion

48.	Which of the following coloured light has the least speed in glass prism ? (a) violet (b) yellow (c) red (d) green
Answer» Which of the following coloured light has the least speed in glass prism ? (a) violet (b) yellow (c) red (d) green

Discussion

49.	in simple microscope where object should be placed and what is visual angle. Why simple microscope does not have large magnification?
Answer» in simple microscope where object should be placed and what is visual angle. Why simple microscope does not have large magnification?

Discussion

50.	Which of the following power plant has the longest physical life?
Answer» Which of the following power plant has the longest physical life?

50.

Which of the following power plant has the longest physical life?

Answer»

Which of the following power plant has the longest physical life?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A LENS IS PLACED BETWEEN A SOURCE AND A SCREEN.IT FORMS IMAGES OF AREA A_1 AND A_{2 } FOR TWI DIFFERENT POSITIONS.THE AREA OF THE SOURCE OF LIGHT I

A wheel has angular acceleration of 3.0rad/sec² and angular speed od 2.00rad/sec in a time of 2sec it has rotated through an angle

Calculate the current flowing through 1.5 kW-250 V electric heater.

17.A nucleus of 84Po210 originally at rest emit alpha with speed v . Recoil speed of daughter nucleus is

The human eye can be regarded as a single spherical refractive surface having curvature of cornea 7.8 mm. If a parallel beam of light comes to focus at 3.075 cm behind the refractive surface, the refractive index of the eye is

What is frequency of alternate current in India

Q. A long solenoid has 200 turns per cm and carries a current I . The magnetic field at the centre is 6.28\ast10^{-2}Wbm^{-2}.Another long solenoid has 100 turns per cm and it carries a current I/3. The value of magnetic field at its centre is?

What is meant by scattering of light?

What is the nature of image formed by a concave mirror if the magnification produced by the mirror is (a) + 4, and (b) - 2 ?

Question 17How are we able to see nearby and also the distant objects clearly?

What is the relation between the incident ray on a glass slab and the emergent ray?

17. Find the equivalent capacitance with refrence to given figure if each capacitor has capacitance of 4microfarad?

Which of the following instruments uses the phenomenon of induced EMF?

A coil of wire of 1000 turns has self inductance 120 millinery. What is the self inductance of a coil of 250 turns?

State giving reasons, whethere the following nuclear disintegrations allowed or not (star indicates an excited state). [2 MARKS] (a) AZX∗→AZX+γ (b) AZX→AZ−2X+42He

The velocity of light in two different media are 2×108 ms−1 and 2.5×108 ms−1 respectively. The critical angle for these media is

which has least polarity H-F O-H C-H N-H explain ?

Question 25Explain the structure and functioning of human eye. How are we able to see nearby as well as distant objects?

A current 2.0 A is passed for 5 hours through a moltenmetal salt deposits 22 g of metal (At. wt. 177), theoxidation state of the metal in the metal salt is:(a) +1(c) +3(b) +2(d) +4

What is the relationship between magnification and focal length of spherical mirror?

For 0

Estimate the charge on 26 gm of Na+

Question 22 A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent, if instead of water we use liquids like, kerosene or turpentine? Support your answer with reason.

A square loop of side 2a and carrying current I is kept in x−z plane with its centre at origin. A long wire carrying the same current I is placed parallel to z− axis and passing through point (0,b,0), (b&gt;&gt;a). The magnitude of torque on the loop about z− axis will be :

Final image of a point source O placed at the bottom of the container filled with water in it is formed at 25 cm below the water level as shown in the figure. Focal length of the mirror (in cm) is

11. If the gravitational potential due to the earth on itssurface is assumed to be zero, then gravitationalpotential at height 2R from surface will beRadius of the earth; g: acceleration due to(Rgravity on earth surface)GMmgRegRe(2)3(1)2gRe(3)32gRg(4)R23

A mirror forms an image which is 30 cm from an object and twice its height. (a) Where must the mirror be situated? (b) What is the radius of curvature? (c) Is the mirror convex or concave?

Resistance of n resistors each of r Ω, when connected in parallel give an equivalent resistance of R Ω. If these resistance's were connected in series, the combination would have a resistance in Ω, equal to

What is the use of a kink in a clinical thermometer? Write the steps to measure the body temperature with a clinical thermometer?

short distance travelled by particle exclusive SHM from the mean position in 2 second is equal to root 3 by 2 time its amplitude determine the time period

A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross-section, what will be its new resistance?

Calculate the image distance for an object of height 12 mm at a distance of 0.20 m from a concave lens of focal length 0.30 m, and state the nature and size of the image.

1 electron volt per second is equal to:[1 mark]

How do moving charges create a magnetic field?

65.A tangen galvanometer has 80 turns of wire,The internal and external diameter of the coil are 19 cm and 21 cm respectively.The reduction factor of the galvanometer at a place where H= 0.32 oersted will be

a 4 dioptre lens is used as magnifying glass where should object be placed to obtain maximum angular magnification for normal eye?

Explain the sign convention for spherical mirrors.

45. Effect of wavelength on focal length of a mirror and lens

An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What is the power of the bulb?

When two different stones of masses 1 kg and 2 kg are taken to the same heights, then:

Two identical fuses are rated at 10A. If they are joined (A) in parallel, the combination acts as a fuse of rating 20A (B) in parallel, the combination acts as a fuse of rating 5A (C) in series, the combination acts as a fuse of rating 10A (D) in series, the combination acts as a fuse of rating 20A

Thermoelectric thermometer is based on

A uniform metre scale is kept in equilibrium. It is supported at 60 cm mark and a mass M is suspended at 90 cm mark as shown in the figure. What is the relation between the weight of the scale(W) and the weight of mass(M)?

What is bicycle dynamo

A voltage v=166sin314t+20sin942t V is applied to the primary of a transformer. If the transformer has 100 turns in the primary, the rms value of the core flux in mWb is ________.3.7

Which of the following coloured light has the least speed in glass prism ? (a) violet (b) yellow (c) red (d) green

in simple microscope where object should be placed and what is visual angle. Why simple microscope does not have large magnification?

Which of the following power plant has the longest physical life?

A square loop of side 2a and carrying current I is kept in x−z plane with its centre at origin. A long wire carrying the same current I is placed parallel to z− axis and passing through point (0,b,0), (b>>a). The magnitude of torque on the loop about z− axis will be :