Physics Test - ...

What is the need for laminating the core of a transformer ?

A system of two particles is undergoing a perfectly elastic collision. Which of the following quantity is not constant during the collision?

The measurement of the gravitational pull on an object is its?

A wire of length $3 m$ and area of cross-section $1.7\times {10}^{-6} m^2$ has a resistance $3\times {10}^{-2} \Omega$. Calculate the resistivity of the wire.

If the gravitational acceleration at any place is doubled, then the weight of body will be ?

What should be constant for momentum to be constant?

In a common-emitter transistor amplifier, the audio signal voltage across the collector is \(3{~V}\). The resistance of collector is \(3 {k} \Omega\). If the current gain is 100 and the base resistance is \(2 {k} \Omega\), the voltage and power gain of the amplifier are:

For a missile launched with a velocity less than the earth’s escape velocity, the total energy is?

Why do we feel comfortable under a fan?

Piezometer is used to measure?