1. ASSERTION : Angle of repose is equal to angle of limiting friction REASON : When the body is just at the point of motion, the force of friction in this stage is called as limiting friction.
Correct!
Wrong!
2. ASSERTION : Centripetal force is always required for motion in curved path. REASON : On a banked curved track, vertical component of normal reaction provides the necessary centripetal force.
Correct!
Wrong!
3. ASSERTION : In an elastic collision of two bodies, the momentum and energy of each body is conserved. REASON : If two bodies stick to each other, after colliding, the collision is said to be perfectly elastic.
Correct!
Wrong!
4. ASSERTION : Angular speed of a planet around the sun increases, when it is closer to the sun. REASON : Total angular momentum of the system remains constant.
Correct!
Wrong!
5. ASSERTION : A particle strikes head-on with another stationary particle such that the first particle comes to rest after collision. The collision should necessarily be elastic. REASON : In elastic collision, there is a loss of momentum of the system of the particles.
Correct!
Wrong!
6. ASSERTION : A needle placed carefully on the surface of water may float, whereas the ball of the same material will always sink. REASON : The buoyancy of an object depends both on the materials and shape of the object.
Correct!
Wrong!
7. ASSERTION : It is not possible for a system, unaided by an external agency to transfer heat from a body at lower temperature to another body at a higher temperature. REASON : It is not possible to violate the second law of thermodynamics.
Correct!
Wrong!
8. ASSERTION : On going away from a point charge or a small electric dipole, electric field decreases at the same rate in both the cases. REASON : Electric field is inversely proportional to square of distance from the charge or on electric dipole.
Correct!
Wrong!
9. ASSERTION : If a proton and an a-particle enter a uniform magnetic field perpendicularly with the same speed, the time period of revolution of a-particle is double that of proton. REASON : In a magnetic field, the period of revolution of a charged particle is directly proportional to the mass of the particle and is inversely proportional to charge of particle.
Correct!
Wrong!
10. ASSERTION : Induced electric field due to changing magnetic flux are more readily observed than induced magnetic field due to changing electric field. REASON : The induced field depends on change in flux.
Correct!
Wrong!
PHYSICS DAY-10
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