The near point and far point of a person are 40 cm and 250 cm respectively. Determine the power of the lens he/she should use while reading a book kept at distance 25 cm from the eye.
1. 2.5 D
2. 5.0 D
3. 1.5 D
4. 3.5 D
Subtopic: Human Eye |
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The dimensional formula for electric flux is
1. [ ML3 I-1 T-3 ]
2. [ M2 L2 I-1 T-2 ]
3. [ ML3 I1 T-3 ]
4. [ ML-3 I-1 T-3 ]
Subtopic: Dimensions |
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An electron of mass 
1. 1
2.
3
4. 1836
Subtopic: Electric Field |
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Assertion (A): In an elastic collision between two bodies, the relative speed of the bodies after collision is equal to the relative speed before the collision.
Reason (R):In an elastic collision, the linear momentum of the system is conserved.
1. If both Assertion and Reason are true and Reason is correct expolanation of Assertion.
2. If both Assertion and Reason are true but Reason isnot the correct expolanation of Assertion.
3. If Assertion is true but Reason is false.
4. If both Assertion and Reason are false.
Subtopic: Linear Momentum |
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Assertion (A): If there is no external torque on a body about its centre of mass, then the velocity of the centre of mass remains constant.
Reason (R):The linear momentum of an isolated system remains constant.
Reason (R):The linear momentum of an isolated system remains constant.
1. If both Assertion and Reason are true and Reason is correct explanation of Assertion.
2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
3. If Assertion is true but Reason is false.
4. If both Assertion and Reason are false.
Subtopic: Center of Mass |
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Assertion (A): An astronaut in an orbiting space station above the earth experience weightlessness.
Reason (R):An object moving around the earth under the influence of earth’s gravitational force is in a state of ‘free fall’.
Reason (R):An object moving around the earth under the influence of earth’s gravitational force is in a state of ‘free fall’.
1. If both Assertion and Reason are true and Reason is correct explanation of Assertion.
2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
3. If Assertion is true but Reason is false.
4. If both Assertion and Reason are false.
Subtopic: Acceleration due to Gravity |
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Assertion (A): The stream of water flowing at high speed from a garden hose, pipe tends to spread like a fountain when held vertically up but tends to narrow down when held vertically down.
Reason (R):In any steady flow of an incompressible fluid, the volume flow rate of the fluid remains constant.
Reason (R):In any steady flow of an incompressible fluid, the volume flow rate of the fluid remains constant.
1. If both Assertion and Reason are true and Reason is correct explanation of Assertion.
2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
3. If Assertion is true but Reason is false.
4. If both Assertion and Reason are false.
Subtopic: Equation of Continuity |
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Assertion (A): The total translational kinetic energy of all the molecules of a given mass of an ideal gas is 1.5 times the product of its pressure and volume.
Reason (R):The molecules of gas collide with each other and the velocities of the molecules change due to the collision.
Reason (R):The molecules of gas collide with each other and the velocities of the molecules change due to the collision.
1. If both Assertion and Reason are true and Reason is correct explanation of Assertion.
2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
3. If Assertion is true but Reason is false.
4. If both Assertion and Reason are false.
Subtopic: Kinetic Energy of an Ideal Gas |
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Assertion (A): The relation between u, v and f for the spherical mirror is valid only for mirrors whose sizes are very small compared to their radii of curvature.
Reason (R): The laws of reflection are strictly valid for plane surfaces but not for large spherical surfaces.
Reason (R): The laws of reflection are strictly valid for plane surfaces but not for large spherical surfaces.
1. If both Assertion and Reason are true and Reason is correct explanation of Assertion.
2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
3. If Assertion is true but Reason is false.
4. If both Assertion and Reason are false.
Subtopic: Reflection at Spherical Surface |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | In a meter bridge experiment null point for an unknown resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by increasing the value of the standard resistance. |
| Reason (R): | Resistance of metal increases with an increase in temperature. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Wheatstone Bridge |
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