Physics Test - ...

A circuit has a section \({AB}\) as shown in figure. The emf of the source equals \({E}=10 {~V}\), the capacitor capacitances are equal to \({C}_{1}=1.0 \mu {F}\) and \({C}_{2}=2.0 \mu {F}\) and the potential difference \({V}_{{A}}-{V}_{{B}}=5.0 {~V}\). Find the voltage across each capacitor.

The kinetic energy of a body increases from 50 J to 150 J in 10 s. Then the power of the body is:

What would be the escape velocity (in km/s) from a planet of mass\(\frac{1}{4}\)th of mass of earth and radius \(\frac{1}{9}\)th the radius of the earth, if escape velocity from the earth is 11 km/s?

A current carrying rectangular loop is placed in the uniform magnetic field, if the angle between the area vector and the magnetic field is increased then the torque on the loop will:

The output of a NAND gate is 0 if the inputs are ________.

The electrostatic force of repulsion between two positively charged ions carrying equal charge is \(3.7 \times 10^{-9} \mathrm{~N}\), when they are separated by a distance of \(5\)Å. How many electrons are missing from each ion?

The dimensional formula of the coefficient of thermal conductivity is :

In a moving coil galvanometer, if the current flowing through it is increased, then the deflection in the coil will:

While teaching in a class Mayank ask a question on the equilibrium of particle as shown in the figure and ask the student to find the weight of a body, if T₂ = 100 N. Shreya gives the correct answer. So, what is the answer given by Shreya? 

A 220 V, 100 W bulb is connected to a 110 V source. Calculate the power consumed by the bulb.

A transformer is used to light a \(100 W\) and \(110 V\) lamp from \(220 V\) mains. If the main current is \(0.5\) amp, the efficiency of the transformer is approximately:

In a solar cell, the maximum power obtained when sun light is illuminated on it is 65 mW. The fill factor of the solar cell is 0.65. Which of the following I-V characteristics will represent the above solar cell?

Consider an excited hydrogen atom in state n moving with a velocity v (v<< c). It emits a photon in the direction of its motion and changes its state to a lower state m. Apply momentum and energy conservation principle to calculate the frequency v of the emitted radiation. Compare this with the frequency v₀ emitted if the atom were at rest.

The magnetic field intensity inside the toroid is B. If the current in the toroid is doubled then the magnetic field intensity inside the toroid will become:

In two single turn circular loop of wire have radius \(20 \mathrm{~cm}\) and \(2 \mathrm{~cm}\). The loops lies in the same plane and are concentric. Find the mutual inductance of the pair is: