Physics Test - ...

A man increases his speed by 2m/s, then his kinetic energy gets doubled. The original speed of the man is:

What is the correct dimensional formula for energy density?

In an electromagnetic wave, the magnitude of electric and magnetic fields are 100 V/m and 0.265 A/m. The maximum energy flow is:

A paramagnetic sample shows a net magnetisation of \(6 \mathrm{~A} / \mathrm{m}\) when it is placed in an external magnetic field of \(0.4 T\) at a temperature of \(4 K\). When the sample is placed in an external magnetic field of \(0.3 T\) at a temperature of \(24 K\), then the magnetisation will be:

Which of the following option is correct regarding energy band of electrons?

In common emitter amplifier, the \(\frac{\mathrm{I}_{\mathrm{c}}}{\mathrm{I}_{\mathrm{e}}}\) is \(0.98 .\) The current gain will be:

If the de Broglie wavelengths associated with a proton and an \(\alpha-\) particle are equal, then the ratio of velocities of the proton and the \(\alpha\) - particle will be:

A point object is placed at the focus of the bi-convex lens. What should be the value of d, so the final image form at infinity?

At what height above the surface of the earth does the weight of an object reduce by \(1 \%\). Given the radius of the earth is \(6400 .\)

If three particles, each of mass \(\mathrm{M}\) are placed at the three corners of an equilateral triangle of side a, the force exerted by this system on another particle of mass \(M\) is placed at the midpoint of a side is:

Which of the following electromagnetic wave is used for thermal imaging?

In the circuit shown below, the ammeter reading is zero. Then, the value of the resistance R is:

A body of mass 5 kg is placed on a rough horizontal surface. What is the maximum value of friction that can act on it? (Given μ = 0.3 and g = 10 m/s²)