16569 + Interview Questions in Physics Page 24 InterviewSolution

1151.	Which mirror always produces a virtual, erect and diminished image of an object ?
Answer» Which mirror always produces a virtual, erect and diminished image of an object ?

Discussion

1152.	Statement I: Lesser the power of the lens, lesser is the convergence or divergence of light.Statement II: Lesser the power, more is the focal length.
Answer» Statement I: Lesser the power of the lens, lesser is the convergence or divergence of light. Statement II: Lesser the power, more is the focal length.

1152.

Statement I: Lesser the power of the lens, lesser is the convergence or divergence of light.Statement II: Lesser the power, more is the focal length.

Answer»

Statement I: Lesser the power of the lens, lesser is the convergence or divergence of light.

Statement II: Lesser the power, more is the focal length.

Discussion

1153.	If refractive angles of two prisms made of crown glass are 10^° and 20^° respectively then ratio of angular dispersion of each prism will be
Answer» If refractive angles of two prisms made of crown glass are 10^° and 20^° respectively then ratio of angular dispersion of each prism will be

Discussion

1154.	In the following pulley system the utility of the fixed pulley is to
Answer» In the following pulley system the utility of the fixed pulley is to

1154.

In the following pulley system the utility of the fixed pulley is to

Answer»

In the following pulley system the utility of the fixed pulley is to

Discussion

1155.	In a closed organ pipe of length 105 cm, standingwaves are set up corresponding to third overtone.What distance from the closed end, a pressurenode is formed?(2) 15 cm(1) 5 cm(3) 25 cm(4) 30 cm
Answer» In a closed organ pipe of length 105 cm, standingwaves are set up corresponding to third overtone.What distance from the closed end, a pressurenode is formed?(2) 15 cm(1) 5 cm(3) 25 cm(4) 30 cm

Discussion

1156.	What is the range of vision of a normal eye?????
Answer» What is the range of vision of a normal eye?????

Discussion

1157.	(a) What current is taken by a 3 kW electric geyser working on 240 V mains ? (b) What size fuse should be used in the geyser circuit ?
Answer» (a) What current is taken by a 3 kW electric geyser working on 240 V mains ? (b) What size fuse should be used in the geyser circuit ?

1157.

(a) What current is taken by a 3 kW electric geyser working on 240 V mains ? (b) What size fuse should be used in the geyser circuit ?

Answer»

(a) What current is taken by a 3 kW electric geyser working on 240 V mains ?

(b) What size fuse should be used in the geyser circuit ?

Discussion

1158.	The ends Q and R of two thin wires, PQ and RS, are soldered (joined) together. Initially each of the wires has a length of 1 m at 10∘C. Now the end P is maintained at 10∘C, while the end S is heated and maintained at 400∘C. The system is thermally insulated from its surroundings. If the thermal conductivity of wire PQ is twice RS and the coefficient of linear thermal expansion of PQ is 1.2×10−5K−1, the change in length of the wire PQ is
Answer» The ends Q and R of two thin wires, PQ and RS, are soldered (joined) together. Initially each of the wires has a length of $1 m$ at $10^{\circ} C$ . Now the end P is maintained at $10^{\circ} C$ , while the end S is heated and maintained at $400^{\circ} C$ . The system is thermally insulated from its surroundings. If the thermal conductivity of wire PQ is twice RS and the coefficient of linear thermal expansion of PQ is $1.2 \times 10^{- 5} K^{- 1}$ , the change in length of the wire PQ is

Discussion

1159.	18.Why in series combination the resistor having less power glow more brightly and if resistance is low then it will less brightly but p and R are directly proportional P=I2R
Answer» 18.Why in series combination the resistor having less power glow more brightly and if resistance is low then it will less brightly but p and R are directly proportional P=I2R

Discussion

1160.	Why electric current makes magnetic fields??
Answer» Why electric current makes magnetic fields??

Discussion

1161.	what is tarry oxidatio
Answer» what is tarry oxidatio

Discussion

1162.	The angle of minimum deviation for a prism of refractive index 1.5 is equal to the angle of the prism. The angle of the prism is (cos 41° = 0.75)
Answer» The angle of minimum deviation for a prism of refractive index $1.5$ is equal to the angle of the prism. The angle of the prism is (cos 41° = 0.75)

Discussion

1163.	What takes place in the fuse which melts it to break the electric circuit?
Answer» What takes place in the fuse which melts it to break the electric circuit?

Discussion

1164.	A square loop ABCD having side l carrying a current i, is placed at a distance l/2; coplanar and parallel with a long straight conductor XY carrying a current I, the net force on the loop will be
Answer» A square loop $A B C D$ having side $l$ carrying a current $i$ , is placed at a distance $l / 2$ ; coplanar and parallel with a long straight conductor $X Y$ carrying a current $I$ , the net force on the loop will be

Discussion

1165.	Which has the larger wavelength, red or blue light?
Answer» Which has the larger wavelength, red or blue light?

Discussion

1166.	In a series circuits one with aluminum wire and other with nichrome wire of same length and thickness.which will produce more heat for the same 6V in both circuits?
Answer» In a series circuits one with aluminum wire and other with nichrome wire of same length and thickness.which will produce more heat for the same 6V in both circuits?

Discussion

1167.	The lens A produces a magnification of, -0.6 whereas lens B produces a magnification of + 0.6. (a) What is the nature of lens A ? (b) What is the nature of lens B ?
Answer» The lens A produces a magnification of, -0.6 whereas lens B produces a magnification of + 0.6. (a) What is the nature of lens A ? (b) What is the nature of lens B ?

Discussion

1168.	Which of the following can be harnessed from the sea?
Answer» Which of the following can be harnessed from the sea?

Discussion

1169.	A solenoid wound over a rectangular frame. If all the linear dimensions of the frame are increased by factor of 3 and number of turns per unit length remains the same , the self inductance increased by factor of- 1) 3 2) 9 3) 27 4) 63
Answer» A solenoid wound over a rectangular frame. If all the linear dimensions of the frame are increased by factor of 3 and number of turns per unit length remains the same , the self inductance increased by factor of- 1) 3 2) 9 3) 27 4) 63

Discussion

1170.	What is the respective number of α and β particles emitted in the following radioactive decay 90X200→80Y168?
Answer» What is the respective number of $α$ and $β$ particles emitted in the following radioactive decay $_{90} X^{200} \to_{80} Y^{168}$ ?

Discussion

1171.	The energy equivalent of 0.5 g of a substance is :
Answer» The energy equivalent of $0.5 g$ of a substance is :

Discussion

1172.	The image of a candle flame by a lens is obtained on a screen placed on the other side.if the image is 3times the size of the flame . At what distance should the candle be placed?what is the nature of the image
Answer» The image of a candle flame by a lens is obtained on a screen placed on the other side.if the image is 3times the size of the flame . At what distance should the candle be placed?what is the nature of the image

Discussion

1173.	Show with the help of a diagram how a total reflecting prism can be used to turn a ray of light through 90∘. Name one instrument in which such a prism is used.
Answer» Show with the help of a diagram how a total reflecting prism can be used to turn a ray of light through $90^{\circ}$ . Name one instrument in which such a prism is used.

Discussion

1174.	What is meant by microbes
Answer» What is meant by microbes

Discussion

1175.	58.A person cannot see any object clearly beyond 40 cm distance from eye. Find the focal length and power of lens he needs in his spectacles for normal vision.
Answer» 58.A person cannot see any object clearly beyond 40 cm distance from eye. Find the focal length and power of lens he needs in his spectacles for normal vision.

Discussion

1176.	Chipko Andokan Originated in: a)Karnataka b)Uttrakhand c)kerala d)Rajasthan
Answer» Chipko Andokan Originated in: a)Karnataka b)Uttrakhand c)kerala d)Rajasthan

1176.

Chipko Andokan Originated in: a)Karnataka b)Uttrakhand c)kerala d)Rajasthan

Answer»

Chipko Andokan Originated in:

a)Karnataka

b)Uttrakhand

c)kerala

d)Rajasthan

Discussion

1177.	If the mass of a body is 5kg, its weight on the surface of the earth would be ___ N (newton). (g=9.8m/s2)
Answer» If the mass of a body is 5kg, its weight on the surface of the earth would be ___ N (newton). $(g = 9.8 m / s^{2})$

Discussion

1178.	In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of the electric mains is 220 V. The minimum capacity of the main fuse of the building will be:
Answer» In a large building, there are $15$ bulbs of $40 W$ , $5$ bulbs of $100 W$ , $5$ fans of $80 W$ and $1$ heater of $1 kW$ . The voltage of the electric mains is $220 V$ . The minimum capacity of the main fuse of the building will be:

Discussion

1179.	A ray of light incident at an angle 480 on a prism of refracting angle 600 suffers minimum deviation. Calculate the angle of minimum deviation.
Answer» A ray of light incident at an angle $48^{0}$ on a prism of refracting angle $60^{0}$ suffers minimum deviation. Calculate the angle of minimum deviation.

Discussion

1180.	A green light is incident from water to the air water interface at critical angle \varnothing. Then spectum of light whose frequency is less than or more thanthat of green l will appear out of the inter
Answer» A green light is incident from water to the air water interface at critical angle \varnothing. Then spectum of light whose frequency is less than or more thanthat of green l will appear out of the inter

Discussion

1181.	Question 1Which of the following is a non-renewable source of energy?(a) Wood(b) Sun(c) Fossil fuels(d) Wind
Answer» Question 1 Which of the following is a non-renewable source of energy? (a) Wood (b) Sun (c) Fossil fuels (d) Wind

Discussion

1182.	a thin convex lens of focal length 20 cm is kept in contact with a plane mirror.The focal length of this cobination will be
Answer» a thin convex lens of focal length 20 cm is kept in contact with a plane mirror.The focal length of this cobination will be

Discussion

1183.	A block of mass 5 kg is sliding on a smooth floor with a velocity of 20 ms−1. The amount of work required to stop it is:
Answer» A block of mass 5 kg is sliding on a smooth floor with a velocity of $20 m s^{- 1}$ . The amount of work required to stop it is:

Discussion

1184.	What is the amount of work to be done on a car of mass 1000 kg to increase its velocity from 10 kmhr−1 to 20 kmhr−1?
Answer» What is the amount of work to be done on a car of mass $1000 kg$ to increase its velocity from $10 k m h r^{- 1}$ to $20 k m h r^{- 1}$ ?

Discussion

1185.	4.If temperature of surface of sun becomes half then the enegy emitted by it to earth per second will reduce to a)1/2 b)1/4 c)1/16 d)1/64
Answer» 4.If temperature of surface of sun becomes half then the enegy emitted by it to earth per second will reduce to a)1/2 b)1/4 c)1/16 d)1/64

Discussion

1186.	A rod of uniform mass is tightly hinged at its centre. Two forces of equal magnitude are applied on the body in same direction at its rear ends. The body will be in
Answer» A rod of uniform mass is tightly hinged at its centre. Two forces of equal magnitude are applied on the body in same direction at its rear ends. The body will be in

Discussion

1187.	A truck has a mass of 8000 kg, a car has a mass of 1000 kg and a bike has a mass of 100 kg. All of them are moving with the same velocity on a road. Then, the kinetic energy will be highest for the:
Answer» A truck has a mass of $8000 k g$ , a car has a mass of $1000 k g$ and a bike has a mass of $100 k g$ . All of them are moving with the same velocity on a road. Then, the kinetic energy will be highest for the:

Discussion

1188.	How ac can travel large distances whereas dc cannot
Answer» How ac can travel large distances whereas dc cannot

Discussion

1189.	A body is dropped from a height h. At height h/2, it will possess _____.
Answer» A body is dropped from a height h. At height h/2, it will possess _____.

Discussion

1190.	In the case of rocket propulsion derive expressions for(a) velocity of rocket at any instant (b)Thrust on the rocket (c)Speed of the rocket when whole fuel is burnt
Answer» In the case of rocket propulsion derive expressions for(a) velocity of rocket at any instant (b)Thrust on the rocket (c)Speed of the rocket when whole fuel is burnt

Discussion

1191.

The following table gives the values of refractive indices of a few media. S.No. 1 2 3 4 5 Medium Water Crown Glass Rock salt Ruby Diamond Refractive index 1.33 1.52 1.54 1.71 2.42 Use this table to give an example of (i) a medium pair so that light speeds up when it goes from one of these media to another (ii) a medium pair so that lights slows down when it goes from one of these media to another.

Answer» The following table gives the values of refractive indices of a few media.

S.No.	1	2	3	4	5
Medium	Water	Crown Glass	Rock salt	Ruby	Diamond
Refractive index	1.33	1.52	1.54	1.71	2.42

Use this table to give an example of (i) a medium pair so that light speeds up when it goes from one of these media to another (ii) a medium pair so that lights slows down when it goes from one of these media to another.

Discussion

1192.	In the spectrum of white light, how many colours have a wavelength less than that of yellow colour?
Answer» In the spectrum of white light, how many colours have a wavelength less than that of yellow colour?

Discussion

1193.	14 In hydrogen atom, the electron moves in an orbit of radius 0.5 A, making 1016 cpsmagnetic moment associated with the orbital motion of electron.
Answer» 14 In hydrogen atom, the electron moves in an orbit of radius 0.5 A, making 1016 cpsmagnetic moment associated with the orbital motion of electron.

Discussion

1194.	the least angle of deviation for a glass prism is equal to its refracting angle . the refractive index of Glass is 1.5 then the angle of prism is
Answer» the least angle of deviation for a glass prism is equal to its refracting angle . the refractive index of Glass is 1.5 then the angle of prism is

Discussion

1195.	69.What is the effect of temperature on conductance and resistance and conductivity and resistivity of intrinsic semiconductors, extrinsic semiconductors ,metallic conductors and insulators?
Answer» 69.What is the effect of temperature on conductance and resistance and conductivity and resistivity of intrinsic semiconductors, extrinsic semiconductors ,metallic conductors and insulators?

Discussion

1196.	Four particles A, B, C and D having masses m, 2m, 3m and 4m respectively are placed in order at the corners of a square of side a. Locate the centre of mass
Answer» Four particles $A$ , $B$ , $C$ and $D$ having masses $m$ , $2 m$ , $3 m$ and $4 m$ respectively are placed in order at the corners of a square of side $a$ . Locate the centre of mass

1196.

Four particles A, B, C and D having masses m, 2m, 3m and 4m respectively are placed in order at the corners of a square of side a. Locate the centre of mass

Answer»

Four particles $A$ , $B$ , $C$ and $D$ having masses $m$ , $2 m$ , $3 m$ and $4 m$ respectively are placed in order at the corners of a square of side $a$ . Locate the centre of mass

Discussion

1197.	Nuclear reactors employ which of the following methods to derive energy?
Answer» Nuclear reactors employ which of the following methods to derive energy?

Discussion

1198.	Equivalent concept
Answer» Equivalent concept

Discussion

1199.	Why does the sky appear black to astronauts?
Answer» Why does the sky appear black to astronauts?

Discussion

1200.	Name two gadgets used at home that have magnets.
Answer» Name two gadgets used at home that have magnets.

Discussion

Explore topic-wise InterviewSolutions in .

Which mirror always produces a virtual, erect and diminished image of an object ?

Statement I: Lesser the power of the lens, lesser is the convergence or divergence of light.Statement II: Lesser the power, more is the focal length.

If refractive angles of two prisms made of crown glass are 10^° and 20^° respectively then ratio of angular dispersion of each prism will be

In the following pulley system the utility of the fixed pulley is to

In a closed organ pipe of length 105 cm, standingwaves are set up corresponding to third overtone.What distance from the closed end, a pressurenode is formed?(2) 15 cm(1) 5 cm(3) 25 cm(4) 30 cm

What is the range of vision of a normal eye?????

(a) What current is taken by a 3 kW electric geyser working on 240 V mains ? (b) What size fuse should be used in the geyser circuit ?

18.Why in series combination the resistor having less power glow more brightly and if resistance is low then it will less brightly but p and R are directly proportional P=I2R

Why electric current makes magnetic fields??

what is tarry oxidatio

The angle of minimum deviation for a prism of refractive index 1.5 is equal to the angle of the prism. The angle of the prism is (cos 41° = 0.75)

What takes place in the fuse which melts it to break the electric circuit?

A square loop ABCD having side l carrying a current i, is placed at a distance l/2; coplanar and parallel with a long straight conductor XY carrying a current I, the net force on the loop will be

Which has the larger wavelength, red or blue light?

In a series circuits one with aluminum wire and other with nichrome wire of same length and thickness.which will produce more heat for the same 6V in both circuits?

The lens A produces a magnification of, -0.6 whereas lens B produces a magnification of + 0.6. (a) What is the nature of lens A ? (b) What is the nature of lens B ?

Which of the following can be harnessed from the sea?

A solenoid wound over a rectangular frame. If all the linear dimensions of the frame are increased by factor of 3 and number of turns per unit length remains the same , the self inductance increased by factor of- 1) 3 2) 9 3) 27 4) 63

What is the respective number of α and β particles emitted in the following radioactive decay 90X200→80Y168?

The energy equivalent of 0.5 g of a substance is :

The image of a candle flame by a lens is obtained on a screen placed on the other side.if the image is 3times the size of the flame . At what distance should the candle be placed?what is the nature of the image

Show with the help of a diagram how a total reflecting prism can be used to turn a ray of light through 90∘. Name one instrument in which such a prism is used.

What is meant by microbes

58.A person cannot see any object clearly beyond 40 cm distance from eye. Find the focal length and power of lens he needs in his spectacles for normal vision.

Chipko Andokan Originated in: a)Karnataka b)Uttrakhand c)kerala d)Rajasthan

If the mass of a body is 5kg, its weight on the surface of the earth would be ___ N (newton). (g=9.8m/s2)

In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of the electric mains is 220 V. The minimum capacity of the main fuse of the building will be:

A ray of light incident at an angle 480 on a prism of refracting angle 600 suffers minimum deviation. Calculate the angle of minimum deviation.

A green light is incident from water to the air water interface at critical angle \varnothing. Then spectum of light whose frequency is less than or more thanthat of green l will appear out of the inter

Question 1Which of the following is a non-renewable source of energy?(a) Wood(b) Sun(c) Fossil fuels(d) Wind

a thin convex lens of focal length 20 cm is kept in contact with a plane mirror.The focal length of this cobination will be

A block of mass 5 kg is sliding on a smooth floor with a velocity of 20 ms−1. The amount of work required to stop it is:

What is the amount of work to be done on a car of mass 1000 kg to increase its velocity from 10 kmhr−1 to 20 kmhr−1?

4.If temperature of surface of sun becomes half then the enegy emitted by it to earth per second will reduce to a)1/2 b)1/4 c)1/16 d)1/64

A rod of uniform mass is tightly hinged at its centre. Two forces of equal magnitude are applied on the body in same direction at its rear ends. The body will be in

A truck has a mass of 8000 kg, a car has a mass of 1000 kg and a bike has a mass of 100 kg. All of them are moving with the same velocity on a road. Then, the kinetic energy will be highest for the:

How ac can travel large distances whereas dc cannot

A body is dropped from a height h. At height h/2, it will possess _____.

In the case of rocket propulsion derive expressions for(a) velocity of rocket at any instant (b)Thrust on the rocket (c)Speed of the rocket when whole fuel is burnt

In the spectrum of white light, how many colours have a wavelength less than that of yellow colour?

14 In hydrogen atom, the electron moves in an orbit of radius 0.5 A, making 1016 cpsmagnetic moment associated with the orbital motion of electron.

the least angle of deviation for a glass prism is equal to its refracting angle . the refractive index of Glass is 1.5 then the angle of prism is

69.What is the effect of temperature on conductance and resistance and conductivity and resistivity of intrinsic semiconductors, extrinsic semiconductors ,metallic conductors and insulators?

Four particles A, B, C and D having masses m, 2m, 3m and 4m respectively are placed in order at the corners of a square of side a. Locate the centre of mass

Nuclear reactors employ which of the following methods to derive energy?

Equivalent concept

Why does the sky appear black to astronauts?

Name two gadgets used at home that have magnets.