CUET (UG) entrance exam Question Bank Solutions for Physics

Phase diffⁿ between voltage and current in a capacitor in A.C Circuit is.

In a transformer Np = 500, Ns = 5000. Input voltage is 20 volt and frequency is 50 HZ. Then in the output, we have,

Two electrons are ejected in opposite directions from radioactive atoms in a sample of radioactive material. Let c denote the speed of light. Each electron has a speed of 0.67 c as measured by an observer in the laboratory. Their relative velocity is given by ______.

The half-life of a radioactive nuclide is 20 hrs. The fraction of the original activity that will remain after 40 hrs is ______.

If 10% of a radioactive material decay in 5 days, then the amount of original material left after 20 days is approximately :

The half-life of the radioactive substance is 40 days. The substance will disintegrate completely in

NAND and NOR gates are called universal gates primarily because they ______.

The current obtained from a simple filterless rectifier is

A radar is sending out pules of 1 micro second duration at interval of 100 micro-second. The range of the radar is

The Boolean expression for NAND gate is

The output of 2-input or gate is zero only when its

An oscillator is nothing but an amplifier with

In potential barrier development in a junction diode opposes

A CE amplifier has a voltage gain 50, an input impedance of 1000 ohm 1 and an output impedance of 200 ohm. The power gain of the amplifier will be

The higher and lower fixed points on a thermometer are separated by 160 mm. When the length of the mercury thread above the lower point is 40 mm, the temperature reading would be :

Water at 10°C enters into a geyser. The water drawn out from the geyser has a temperature of 60°C and the rate of outflow of water is 18 kg/hr. The rating of the geyser is :

When an oscillator completes 100 oscillations its amplitude reduces to `1/3` of its initial value. What will be its amplitude, when it completes 200 oscillations?

A convex lens with radii of curvature R₁ = R₂ is immersed in water. Assuming that the refractive indices of glass and water are 3/2 and 4/3 respectively, its focal length f₁ in comparison to that in air, f, is ______.

A series LCR circuit contains inductance 5 mH, capacitance 2µF and resistance ion. If a frequency A.C. source is varied, what is the frequency at which maximum power is dissipated?