50278 + Interview Questions in Physics

1.	Find the average velocity of tip of the minute hand of an analog watch when it turn for 15 minutes.
Answer» Find the average velocity of tip of the minute hand of an analog watch when it turn for $15 minutes$ .

Discussion

2.	A triode has mutual conductance = 2.0 millimho and plate resistance =20KΩ It is desired to amplify a signal by a factor of 30. What load resistance should be added in the circuit?
Answer» A triode has mutual conductance = 2.0 millimho and plate resistance $= 20 K Ω$ It is desired to amplify a signal by a factor of 30. What load resistance should be added in the circuit?

Discussion

3.	The velocity of centre of mass of a rolling disc is v. Considering sufficient friction to prevent any slipping, the magnitude of velocity at the highest point on the disc is
Answer» The velocity of centre of mass of a rolling disc is $v$ . Considering sufficient friction to prevent any slipping, the magnitude of velocity at the highest point on the disc is

Discussion

4.	Three particles A, B and C of masses 2 kg, 3 kg and 5 kg are placed at the vertices of a scalene triangle as shown in the figure. Find the location of COM of the three particle system
Answer» Three particles $A, B$ and $C$ of masses $2 kg$ , $3 kg$ and $5 kg$ are placed at the vertices of a scalene triangle as shown in the figure. Find the location of $C O M$ of the three particle system

Discussion

5.	Why does tinder make same sound as bursting of Ballon
Answer» Why does tinder make same sound as bursting of Ballon

Discussion

6.	Two large glass plates are placed vertically and parallel to each other inside a tank of water with separation between the plates equal to 1 mm. Find the rise of water in the space between the plates. Surface tension of water =0.075Nm−1.
Answer» Two large glass plates are placed vertically and parallel to each other inside a tank of water with separation between the plates equal to 1 mm. Find the rise of water in the space between the plates. Surface tension of water = $0.075 N m^{- 1}$ .

Discussion

7.	Two particles are in SHM in a straight line about same equilibrium position. Amplitude A and time period T of both the particles are equal. At time t=0, one particle is at displacement y1=+A and the other at y2=−A2, and they are approaching towards each other. After what time they cross each other?
Answer» Two particles are in SHM in a straight line about same equilibrium position. Amplitude $A$ and time period $T$ of both the particles are equal. At time $t = 0$ , one particle is at displacement $y_{1} = + A$ and the other at $y_{2} = - \frac{A}{2}$ , and they are approaching towards each other. After what time they cross each other?

Discussion

8.	The figure shows the graph of the x−coordinate of a particle moving along the x−axis as a function of time. Average velocity during t=0 to t=6 s is
Answer» The figure shows the graph of the $x -$ coordinate of a particle moving along the $x -$ axis as a function of time. Average velocity during $t = 0$ to $t = 6 s$ is

Discussion

9.	A heavy uniform chain lies on the top of horizontal table. If the coefficient of static friction between the chain and the table surface is 0.2, then the maximum fraction of the length of the chain that can be hung over one edge of the table is:
Answer» A heavy uniform chain lies on the top of horizontal table. If the coefficient of static friction between the chain and the table surface is $0.2$ , then the maximum fraction of the length of the chain that can be hung over one edge of the table is:

Discussion

10.	In the figure shown, the particles have charges q1 = −q2 = 300 nC and q3 = −q4 =200 nC, and distance a = 5.0 cm. What are the (A) magnitude and (B) angle (relative to the +x direction) of the net force on particle 3?
Answer» In the figure shown, the particles have charges $q_{1}$ = $- q_{2}$ = 300 nC and $q_{3}$ = $- q_{4}$ =200 nC, and distance a = 5.0 cm. What are the (A) magnitude and (B) angle (relative to the +x direction) of the net force on particle 3?

10.

In the figure shown, the particles have charges q1 = −q2 = 300 nC and q3 = −q4 =200 nC, and distance a = 5.0 cm. What are the (A) magnitude and (B) angle (relative to the +x direction) of the net force on particle 3?

Answer»

In the figure shown, the particles have charges $q_{1}$ = $- q_{2}$ = 300 nC and $q_{3}$ = $- q_{4}$ =200 nC, and distance a = 5.0 cm. What are the (A) magnitude and (B) angle (relative to the +x direction) of the net force on particle 3?

Discussion

11.	A bullet is fired with a velocity of 196 ms−1 at an angle 30∘ with the horizontal. Calculate the maximum height attained by the bullet. (Take g=9.8 m/s2)
Answer» A bullet is fired with a velocity of $196 {ms}^{- 1}$ at an angle $30^{\circ}$ with the horizontal. Calculate the maximum height attained by the bullet. (Take $g = 9.8 {m/s}^{2}$ )

Discussion

12.	A horizontal 90 kg merry-go-round is a solid disc of radius 1.50 m is started from rest by a constant horizontal force of 50 N applied tangentially to the edge of the disc. The kinetic energy of the disc after 3 s is
Answer» A horizontal $90 kg$ merry-go-round is a solid disc of radius $1.50 m$ is started from rest by a constant horizontal force of $50 N$ applied tangentially to the edge of the disc. The kinetic energy of the disc after $3 s$ is

Discussion

13.	Three equal resistance each of 10 ohm are connected (2 in parallel, and 1 in series). The maximum safe power consumed by each resistor is 20W. The maximum safe power consumed by the combination is?
Answer» Three equal resistance each of 10 ohm are connected (2 in parallel, and 1 in series). The maximum safe power consumed by each resistor is 20W. The maximum safe power consumed by the combination is?

Discussion

14.	Time period of a satellite revolving above Earth’s surface at a height equal to R, where R the radius of Earth, is
Answer» Time period of a satellite revolving above Earth’s surface at a height equal to R, where R the radius of Earth, is

Discussion

15.	An ice cube contains a large air bubble. The cube is floating on the surface of water contained on a trough. What will happen to the water level, when the cube melts?
Answer» An ice cube contains a large air bubble. The cube is floating on the surface of water contained on a trough. What will happen to the water level, when the cube melts?

Discussion

16.	A body is then vertically upwards from the surface of the earth. What is the direction of its velocity and acceleration in its way up?
Answer» A body is then vertically upwards from the surface of the earth. What is the direction of its velocity and acceleration in its way up?

Discussion

17.	A block of mass m is placed on a surface with a vertical cross-section represented by the equation y=x36. If the coefficient of static friction is 0.5, the maximum height above the ground at which the block can be placed without slipping is
Answer» A block of mass $m$ is placed on a surface with a vertical cross-section represented by the equation $y = \frac{x^{3}}{6}$ . If the coefficient of static friction is $0.5$ , the maximum height above the ground at which the block can be placed without slipping is

Discussion

18.	what does it mean? - the entire mass of any object is at the center of the earth
Answer» what does it mean? - the entire mass of any object is at the center of the earth

Discussion

19.	Compare equations for rate of flow of heat through a conductor and current through a conductor and write the expression for thermal resistance.
Answer» Compare equations for rate of flow of heat through a conductor and current through a conductor and write the expression for thermal resistance.

Discussion

20.	A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 m/s .what is the amount of gas ejected per second to supply the needed thrust and to give an upward acceleration of 20 m/s2
Answer» A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 m/s .what is the amount of gas ejected per second to supply the needed thrust and to give an upward acceleration of 20 m/s²

Discussion

21.	Electromagnetic waves differ from matter waves in many respects.substantiate.
Answer» Electromagnetic waves differ from matter waves in many respects.substantiate.

Discussion

22.	How does a P-N Junction in reverse bias allow current to flow through it? Is Zener Diode the same as a P-N Juction in reverse bias?
Answer» How does a P-N Junction in reverse bias allow current to flow through it? Is Zener Diode the same as a P-N Juction in reverse bias?

Discussion

23.	The temperature and relative humidity in a room are 300 K and 20 % respectively. The volume of the room is 50 ma. The saturation vapour pressure at 300 K is 3-3 kPa. Calculate the mass of the water vapour present in the room.
Answer» The temperature and relative humidity in a room are 300 K and 20 % respectively. The volume of the room is 50 ma. The saturation vapour pressure at 300 K is 3-3 kPa. Calculate the mass of the water vapour present in the room.

Discussion

24.	Actually what is long wavelength limit and short wavelength limit??
Answer» Actually what is long wavelength limit and short wavelength limit??

Discussion

25.	An enclosure of volume V contains a mixture of 8 g of oxygen, 14 g of nitrogen and 22 g of carbon- dioxide at absolute temperature T. The pressure of the mixture of gases is (R is universal gas constant)
Answer» An enclosure of volume $V$ contains a mixture of $8 g$ of oxygen, $14 g$ of nitrogen and $22 g$ of carbon- dioxide at absolute temperature $T$ . The pressure of the mixture of gases is ( $R$ is universal gas constant)

Discussion

26.	Find the position of the centre of mass of T - shaped lamina of negligible thickness as shown in figure. Assume the origin to be at the intersection of axes and take the mass density of the lamina, σ=1 kg/m2
Answer» Find the position of the centre of mass of $T$ - shaped lamina of negligible thickness as shown in figure. Assume the origin to be at the intersection of axes and take the mass density of the lamina, $σ = 1 {kg/m}^{2}$

Discussion

27.	A spherical water drop of radius r is falling with the terminal velocity. Assume that the entire work done against viscous force is dissipated in the form of heat. The rate of heat produced will be proportional to 1) r^2 2) r^3 3) r^4 4) r^5 Ans given is option 4. Please give detailed explanation as I won't be able to understand concise answers.
Answer» A spherical water drop of radius r is falling with the terminal velocity. Assume that the entire work done against viscous force is dissipated in the form of heat. The rate of heat produced will be proportional to 1) r^2 2) r^3 3) r^4 4) r^5 Ans given is option 4. Please give detailed explanation as I won't be able to understand concise answers.

27.

A spherical water drop of radius r is falling with the terminal velocity. Assume that the entire work done against viscous force is dissipated in the form of heat. The rate of heat produced will be proportional to 1) r^2 2) r^3 3) r^4 4) r^5 Ans given is option 4. Please give detailed explanation as I won't be able to understand concise answers.

Answer»

A spherical water drop of radius r is falling with the terminal velocity. Assume that the entire work done against viscous force is dissipated in the form of heat. The rate of heat produced will be proportional to

1) r^2

2) r^3

3) r^4

4) r^5

Ans given is option 4.

Please give detailed explanation as I won't be able to understand concise answers.

Discussion

28.	Q. A stone of mass 4 kg is attached to a string of length of whirled in a horizontal circle. A circle can withstand a tension 160 N. Calculate the maximum velocity that can be given to a stone without breaking the string.
Answer» Q. A stone of mass 4 kg is attached to a string of length of whirled in a horizontal circle. A circle can withstand a tension 160 N. Calculate the maximum velocity that can be given to a stone without breaking the string.

Discussion

29.	When a certain photosensitive surface is illuminated with monochromatic light of wavelength λ, the stopping potential for photoelectric current is 2V0. When the same surface is illuminated with monochromatic light of wavelength 2λ, the stopping potential is V02. The threshold wavelength for photoelectric emission is
Answer» When a certain photosensitive surface is illuminated with monochromatic light of wavelength $λ$ , the stopping potential for photoelectric current is $2 V_{0}$ . When the same surface is illuminated with monochromatic light of wavelength $2 λ$ , the stopping potential is $\frac{V_{0}}{2}$ . The threshold wavelength for photoelectric emission is

Discussion

30.	Which is the positive electrode
Answer» Which is the positive electrode

Discussion

31.	In the following figure, find the direction of friction on the blocks A and B and the ground respectively.
Answer» In the following figure, find the direction of friction on the blocks $A$ and $B$ and the ground respectively.

Discussion

32.	Energy levels A, B and C of a certain atom correspond to increasing values of energy, i.e., EA<EB<EC. If λ1, λ2 and λ3 are the wavelengths of the radiation corresponding to transitions C to B, B to A and C to A respectively, which of the following relations is correct?
Answer» Energy levels A, B and C of a certain atom correspond to increasing values of energy, i.e., $E_{A} < E_{B} < E_{C}$ . If $λ_{1}$ , $λ_{2}$ and $λ_{3}$ are the wavelengths of the radiation corresponding to transitions C to B, B to A and C to A respectively, which of the following relations is correct?

Discussion

33.	Work done in bringing the positive charge from point A to B where A and B are at dimetrically opposite ends of semi-circle. A) Proportional to charge on the shell B) Proportional to the charge brought from. A to B C) Proportional to radius of shell D) Independent of all three
Answer» Work done in bringing the positive charge from point A to B where A and B are at dimetrically opposite ends of semi-circle. A) Proportional to charge on the shell B) Proportional to the charge brought from. A to B C) Proportional to radius of shell D) Independent of all three

33.

Work done in bringing the positive charge from point A to B where A and B are at dimetrically opposite ends of semi-circle. A) Proportional to charge on the shell B) Proportional to the charge brought from. A to B C) Proportional to radius of shell D) Independent of all three

Answer»

Work done in bringing the positive charge from point A to B where A and B are at dimetrically opposite ends of semi-circle.

A) Proportional to charge on the shell

B) Proportional to the charge brought from. A to B

C) Proportional to radius of shell

D) Independent of all three

Discussion

34.	At which height from earth surface acceleration due to gravity is decreased by 75% of its value at earth surface?
Answer» At which height from earth surface acceleration due to gravity is decreased by 75% of its value at earth surface?

Discussion

35.	A particle of mass ′m′ and initially at rest is acted by a force F=at. Best representation of force displacement graph is:
Answer» A particle of mass $^{'} m^{'}$ and initially at rest is acted by a force $F = a t$ . Best representation of force displacement graph is:

Discussion

36.	Assuming all the surfaces to be frictionless, the acceleration of block C shown in the figure is
Answer» Assuming all the surfaces to be frictionless, the acceleration of block $C$ shown in the figure is

Discussion

37.	The frequency of the first line in Lyman series in the hydrogen spectrum is v. What is the frequency of the corresponding line in the spectrum of doubly ionized Lithium?
Answer» The frequency of the first line in Lyman series in the hydrogen spectrum is $v$ . What is the frequency of the corresponding line in the spectrum of doubly ionized Lithium?

Discussion

38.	Define an equipotential surface. Draw equipotential surfaces : (i) in the case of a single point charge and (ii) in a constant electric field in Z-direction. Why the equipotential surfaces about a single charge are not equidistant ? (iii) Can electric field exist tangential to an equipotential surface ? Give reason.
Answer» Define an equipotential surface. Draw equipotential surfaces : (i) in the case of a single point charge and (ii) in a constant electric field in Z-direction. Why the equipotential surfaces about a single charge are not equidistant ? (iii) Can electric field exist tangential to an equipotential surface ? Give reason.

Discussion

39.	An astronomical telescope has on objective of focal length 200 cm and an eye piece of focal length 4.0 cm. The telescope is focused to see an object 10 km from the objective. The final image is formed at infinity. Find the length of the tube and the angular magnification produced by the telescope.
Answer» An astronomical telescope has on objective of focal length $200 c m$ and an eye piece of focal length $4.0 c m$ . The telescope is focused to see an object $10 k m$ from the objective. The final image is formed at infinity. Find the length of the tube and the angular magnification produced by the telescope.

Discussion

40.	Identify the figure which represents the acceleration of a fluid along horizontal direction:
Answer» Identify the figure which represents the acceleration of a fluid along horizontal direction:

Discussion

41.	All the surfaces shown in figure (12-E15) are frictionless. The mass of the car is M, that of the block is m and the spring has spring constant k. Initially, the car and the block are at rest and the spring is stretched through a length x0 when the system is released. (a) Find the amplitudes of the simple harmonic motion of the block and of the car as seen from the road. (b) Find the time period (s) of the two simple harmonic motions.
Answer» All the surfaces shown in figure (12-E15) are frictionless. The mass of the car is M, that of the block is m and the spring has spring constant k. Initially, the car and the block are at rest and the spring is stretched through a length $x_{0}$ when the system is released. (a) Find the amplitudes of the simple harmonic motion of the block and of the car as seen from the road. (b) Find the time period (s) of the two simple harmonic motions.

41.

All the surfaces shown in figure (12-E15) are frictionless. The mass of the car is M, that of the block is m and the spring has spring constant k. Initially, the car and the block are at rest and the spring is stretched through a length x0 when the system is released. (a) Find the amplitudes of the simple harmonic motion of the block and of the car as seen from the road. (b) Find the time period (s) of the two simple harmonic motions.

Answer»

All the surfaces shown in figure (12-E15) are frictionless. The mass of the car is M, that of the block is m and the spring has spring constant k. Initially, the car and the block are at rest and the spring is stretched through a length $x_{0}$ when the system is released. (a) Find the amplitudes of the simple harmonic motion of the block and of the car as seen from the road. (b) Find the time period (s) of the two simple harmonic motions.

Discussion

42.	A parallel plate condenser of capacity 5 μ F is kept connected to a battery of emf 10 V. If the space between the plates is filled with a medium of dielectric constant 12, then the additional charge taken from the battery is?
Answer» A parallel plate condenser of capacity 5 $μ$ F is kept connected to a battery of emf 10 V. If the space between the plates is filled with a medium of dielectric constant 12, then the additional charge taken from the battery is?

Discussion

43.	A magnetic dipole of magnetic moment 0'72 A m2 is placed horizontally with the north pole pointing towards south. Find the position of the neutral point if the horizontal component of the earth's magnetic field is 18 μT.
Answer» A magnetic dipole of magnetic moment 0'72 A $m^{2}$ is placed horizontally with the north pole pointing towards south. Find the position of the neutral point if the horizontal component of the earth's magnetic field is 18 $μ$ T.

Discussion

44.	Choose the correct answer Area bounded by the curve y=x3, the X-axis the coordinates x = - 2 and x = 1 si (a) -9 (b) −154 (c) 154 (d) 174
Answer» Choose the correct answer Area bounded by the curve $y = x^{3}$ , the X-axis the coordinates x = - 2 and x = 1 si (a) -9 (b) $- \frac{15}{4}$ (c) $\frac{15}{4}$ (d) $\frac{17}{4}$

Discussion

45.	In a compound microscope magnification will be large, if the focal length of the eye piece is
Answer» In a compound microscope magnification will be large, if the focal length of the eye piece is

Discussion

46.	Find the speed of block B if the speed of wedge A is 2 m/s as shown in the figure. Assume the surface to be smooth and string inextensible.
Answer» Find the speed of block $B$ if the speed of wedge $A$ is $2 m/s$ as shown in the figure. Assume the surface to be smooth and string inextensible.

Discussion

47.	A complex number z1 is rotated through an angle of θ clockwise, about the origin to reach z2.Then z2z1 equals to
Answer» A complex number z₁ is rotated through an angle of $θ$ clockwise, about the origin to reach $z_{2}$ .Then $\frac{z_{2}}{z_{1}}$ equals to

Discussion

48.	Two bodies of masses m and 4m are moving with equal K.E. The ratio of their linear momenta is
Answer» Two bodies of masses $m$ and $4 m$ are moving with equal $K . E$ . The ratio of their linear momenta is

Discussion

49.	In an endothermic reaction, the value of ∆H is always
Answer» In an endothermic reaction, the value of ∆H is always

Discussion

50.	The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following is true:
Answer» The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following is true:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Find the average velocity of tip of the minute hand of an analog watch when it turn for 15 minutes.

A triode has mutual conductance = 2.0 millimho and plate resistance =20KΩ It is desired to amplify a signal by a factor of 30. What load resistance should be added in the circuit?

The velocity of centre of mass of a rolling disc is v. Considering sufficient friction to prevent any slipping, the magnitude of velocity at the highest point on the disc is

Three particles A, B and C of masses 2 kg, 3 kg and 5 kg are placed at the vertices of a scalene triangle as shown in the figure. Find the location of COM of the three particle system

Why does tinder make same sound as bursting of Ballon

Two large glass plates are placed vertically and parallel to each other inside a tank of water with separation between the plates equal to 1 mm. Find the rise of water in the space between the plates. Surface tension of water =0.075Nm−1.

The figure shows the graph of the x−coordinate of a particle moving along the x−axis as a function of time. Average velocity during t=0 to t=6 s is

A heavy uniform chain lies on the top of horizontal table. If the coefficient of static friction between the chain and the table surface is 0.2, then the maximum fraction of the length of the chain that can be hung over one edge of the table is:

In the figure shown, the particles have charges q1 = −q2 = 300 nC and q3 = −q4 =200 nC, and distance a = 5.0 cm. What are the (A) magnitude and (B) angle (relative to the +x direction) of the net force on particle 3?

A bullet is fired with a velocity of 196 ms−1 at an angle 30∘ with the horizontal. Calculate the maximum height attained by the bullet. (Take g=9.8 m/s2)

A horizontal 90 kg merry-go-round is a solid disc of radius 1.50 m is started from rest by a constant horizontal force of 50 N applied tangentially to the edge of the disc. The kinetic energy of the disc after 3 s is

Three equal resistance each of 10 ohm are connected (2 in parallel, and 1 in series). The maximum safe power consumed by each resistor is 20W. The maximum safe power consumed by the combination is?

Time period of a satellite revolving above Earth’s surface at a height equal to R, where R the radius of Earth, is

An ice cube contains a large air bubble. The cube is floating on the surface of water contained on a trough. What will happen to the water level, when the cube melts?

A body is then vertically upwards from the surface of the earth. What is the direction of its velocity and acceleration in its way up?

A block of mass m is placed on a surface with a vertical cross-section represented by the equation y=x36. If the coefficient of static friction is 0.5, the maximum height above the ground at which the block can be placed without slipping is

what does it mean? - the entire mass of any object is at the center of the earth

Compare equations for rate of flow of heat through a conductor and current through a conductor and write the expression for thermal resistance.

A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 m/s .what is the amount of gas ejected per second to supply the needed thrust and to give an upward acceleration of 20 m/s2

Electromagnetic waves differ from matter waves in many respects.substantiate.

How does a P-N Junction in reverse bias allow current to flow through it? Is Zener Diode the same as a P-N Juction in reverse bias?

The temperature and relative humidity in a room are 300 K and 20 % respectively. The volume of the room is 50 ma. The saturation vapour pressure at 300 K is 3-3 kPa. Calculate the mass of the water vapour present in the room.

Actually what is long wavelength limit and short wavelength limit??

An enclosure of volume V contains a mixture of 8 g of oxygen, 14 g of nitrogen and 22 g of carbon- dioxide at absolute temperature T. The pressure of the mixture of gases is (R is universal gas constant)

Find the position of the centre of mass of T - shaped lamina of negligible thickness as shown in figure. Assume the origin to be at the intersection of axes and take the mass density of the lamina, σ=1 kg/m2

Q. A stone of mass 4 kg is attached to a string of length of whirled in a horizontal circle. A circle can withstand a tension 160 N. Calculate the maximum velocity that can be given to a stone without breaking the string.

Which is the positive electrode

In the following figure, find the direction of friction on the blocks A and B and the ground respectively.

Energy levels A, B and C of a certain atom correspond to increasing values of energy, i.e., EA&lt;EB&lt;EC. If λ1, λ2 and λ3 are the wavelengths of the radiation corresponding to transitions C to B, B to A and C to A respectively, which of the following relations is correct?

Work done in bringing the positive charge from point A to B where A and B are at dimetrically opposite ends of semi-circle. A) Proportional to charge on the shell B) Proportional to the charge brought from. A to B C) Proportional to radius of shell D) Independent of all three

At which height from earth surface acceleration due to gravity is decreased by 75% of its value at earth surface?

A particle of mass ′m′ and initially at rest is acted by a force F=at. Best representation of force displacement graph is:

Assuming all the surfaces to be frictionless, the acceleration of block C shown in the figure is

The frequency of the first line in Lyman series in the hydrogen spectrum is v. What is the frequency of the corresponding line in the spectrum of doubly ionized Lithium?

An astronomical telescope has on objective of focal length 200 cm and an eye piece of focal length 4.0 cm. The telescope is focused to see an object 10 km from the objective. The final image is formed at infinity. Find the length of the tube and the angular magnification produced by the telescope.

Identify the figure which represents the acceleration of a fluid along horizontal direction:

A parallel plate condenser of capacity 5 μ F is kept connected to a battery of emf 10 V. If the space between the plates is filled with a medium of dielectric constant 12, then the additional charge taken from the battery is?

A magnetic dipole of magnetic moment 0'72 A m2 is placed horizontally with the north pole pointing towards south. Find the position of the neutral point if the horizontal component of the earth's magnetic field is 18 μT.

Choose the correct answer Area bounded by the curve y=x3, the X-axis the coordinates x = - 2 and x = 1 si (a) -9 (b) −154 (c) 154 (d) 174

In a compound microscope magnification will be large, if the focal length of the eye piece is

Find the speed of block B if the speed of wedge A is 2 m/s as shown in the figure. Assume the surface to be smooth and string inextensible.

A complex number z1 is rotated through an angle of θ clockwise, about the origin to reach z2.Then z2z1 equals to

Two bodies of masses m and 4m are moving with equal K.E. The ratio of their linear momenta is

In an endothermic reaction, the value of ∆H is always

The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following is true:

Energy levels A, B and C of a certain atom correspond to increasing values of energy, i.e., EA<EB<EC. If λ1, λ2 and λ3 are the wavelengths of the radiation corresponding to transitions C to B, B to A and C to A respectively, which of the following relations is correct?