1. ASSERTION : A hollow shaft is found to be stronger than a solid shaft made of same material. REASON : The torque required to produce a given twist in hollow cylinder is greater than that required to twist a solid cylinder of same size and material.
Correct!
Wrong!
2. ASSERTION : A body that is a good radiator is also a good absorber of radiation at a given wavelength. REASON : According to Kirchoff’s law the absorptivity of a body is equal to its emissivity at a given wavelength.
Correct!
Wrong!
3. ASSERTION : 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 its volume. REASON : The molecules of a gas collide with each other and the velocities of the molecules change due to the collision.
Correct!
Wrong!
4. 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!
5. ASSERTION : Current is passed through a metallic wire so that it becomes red hot. When cold water is poured on half of its portion, the rest of the half portion becomes hotter. REASON : Resistance decreases due to decrease in temperature.
Correct!
Wrong!
6. ASSERTION : In ammeter, current in shunt is always greater than current in galvanometer. REASON : Value of shunt resistance is negative if current in shunt is less than current in galvanometer.
Correct!
Wrong!
7. ASSERTION : A bar magnet is dropped into a long vertical copper tube. Even taking air resistance as negligible, the magnet attains a constant terminal velocity. If the cube is heated, the terminal velocity gets increased. REASON : The terminal velocity depends on eddy current produced in bar magnet.
Correct!
Wrong!
8. ASSERTION : The quantity L/R possesses dimension of time. REASON : To reduce the rate of increase of current through a solenoid, we should increase the time constant (L/R).
Correct!
Wrong!
9. ASSERTION : Light is a transverse wave but not an electromagnetic wave. REASON : Maxwell showed that speed of electromagnetic waves is related to the permittivity of the medium through which it travels.
Correct!
Wrong!
10. ASSERTION : The mirrors used in search lights are parabolic and not concave spherical. REASON : In a concave spherical mirror the image formed is always virtual.
Correct!
Wrong!
Physics quiz day-8
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