Physics Test - 3

In a half wave rectifier, the AC input source of frequency 50 Hz is used. The fundamental frequency of the output is _______Hz.

The minimum number of gates required to realise this expression  are

A number of blocks each of mass 0.4 Kg are placed one over the other. The minimum horizontal force required to pull the eight blocks from the top without disturbing the remaining is 10 N. If g =10 ms^–2, the coefficient of static friction between any two blocks is.

In a transistor amplifier β = 62, R_L = 500Ω and internal resistance of the transistor is 500Ω. Its power amplification will be

A TV tower has a height of 5 m in a region of population density 1000/π per square kilometre. Number of people that can receive the transmission is nearly _______ × 10³.

The power of a motor is 200W.  If the unit of length is halved, that of mass is doubled and that of time is also doubled, then the power of the motor in the new system is

A tank of size 10 m × 10 m × 10 m is full of water and built on the ground. If g = 10 ms^–2, the potential energy of the water in the tank is _____ × 10⁷.

A circular ring of mass M radius R is hung from nail in a wall and the nail is in contact with rim of ring.  If the ring is oscillating in its plane about an axis passing through nail, the expression for its moment of inertia is

A car moves along a straight line whose motion is given by S = 12t + 3t² - 2t³, where S is in meters and ‘t’ is in seconds. The velocity of the car at the start will be

The acceleration due to gravity decreases by Δg₁ when a body is taken to a small height h << R. The acceleration due to gravity decreases by Δg₂ when the body is taken to a depth h from the surface of the earth, then (R = Radius of the earth)