1. ASSERTION : A bulb connected in series with a solenoid is connected to A.C. source. If a soft iron core is introduced in the solenoid, the bulb will glow brighter. REASON : On introducing soft iron core in the solenoid, the inductance increases.
Correct!
Wrong!
2. ASSERTION : Short wave communication over long distance is not possible via ground waves. REASON : The ground waves bend round the curvature of the earth.
Correct!
Wrong!
3. ASSERTION : If earth suddenly stops rotating about its axis, then the value of acceleration due to gravity will become same at all the places. REASON : The value of acceleration due to gravity is independent of rotation of earth.
Correct!
Wrong!
4. ASSERTION : If earth shrink to half its present size, length of the day would become 6 hours. REASON : As size of the earth changes its moment of inertia changes.
Correct!
Wrong!
5. ASSERTION : In a pressure cooker the water is brought to boil. The cooker is then removed from the stove. Now on removing the lid of the pressure cooker, the water starts boiling again. REASON : The impurities in water bring down its boiling point.
Correct!
Wrong!
6. ASSERTION : Soldiers are asked to break steps while crossing the bridge. REASON : The frequency of thick marching may be equal to the natural frequency of bridge and may lead to resonance which can break the bridge.
Correct!
Wrong!
7. ASSERTION: For a charged particle moving from point P to point Q, the net work done by an electrostatic field on the particle is independent of the path connecting point P to point Q. REASON : The net work done by a conservative force on an object moving along a closed loop is zero.
Correct!
Wrong!
8. ASSERTION : The properties of paramagnetic and ferromagnetic substance are not effected by heating. REASON : As temperature rises, the alignment of molecular magnets gradually increases.
Correct!
Wrong!
9. ASSERTION : Dispersion of light occurs because velocity of light in a material depends upon its colour. REASON : The dispersive power depends only upon the material of the prism, not upon the refracting angle of the prism.
Correct!
Wrong!
10. ASSERTION : If a heavy nucleus is split into two medium sized parts, each of the nuclei will have more binding energy per nucleon than the original nucleus. REASON : Joining two light nuclei together to give a single nucleus of medium size means more binding energy per nucleon than the two nucleus.
Correct!
Wrong!
PHYSICS DAY-9
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