ASSERTION : Power of an engine depends on mass, angular speed, torque and angular momentum, then the formula of power is not derived with the help of dimensional method. REASON : In mechanics, if a particular quantity depends on more than three quantities, then we cannot derive the formula of the quantity by the help of dimensional method.
Correct!
Wrong!
ASSERTION : Two balls of different masses are thrown vertically upward with same speed. They will pass through their point of projection in the downward direction with the same speed. REASON : The maximum height and downward velocity attained at the point of projection are independent of the mass of the ball.
Correct!
Wrong!
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!
ASSERTION : Escape velocity is greater than its orbital velocity of a satellite. REASON : Orbit of a satellite is within the gravitational field of earth whereas escaping is beyond the gravitational field of earth.
Correct!
Wrong!
ASSERTION : A hollow metallic closed container with small opening maintained at a high temperature can act as a source of black body radiation. REASON : All metals act as black body radiator.
Correct!
Wrong!
ASSERTION : The specific heat of a gas in an adiabatic process is zero and in an isothermal process is infinite. REASON : Specific heat of gas is directly proportional to change of heat in system and inversely proportional to change in temperature.
Correct!
Wrong!
ASSERTION : The root mean square and most probable speeds of the molecules in a gas are the same. REASON : The Maxwell distribution for the speed of molecules in a gas is symmetrical.
Correct!
Wrong!
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!
ASSERTION : When observer moves away from the source the frequency of sound appears to decreases. REASON : The apparent frequency of sound depends on, whether the observer is moving towards source or away from source.
Correct!
Wrong!
ASSERTION : If a conducting medium is placed between two charges, then electric force between them becomes zero. REASON : Reduction in a force due to introduced material is inversely proportional to its dielectric constant.
Correct!
Wrong!
A&R Quiz - Phy(Day 1)
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