Physics Test 29...

A ball is thrown vertically upwards with an initial velocity of 20 m/s from a height of 25 m. What is the total time taken by the ball to hit the ground? (Take g = 10 m/s²)

A parallel-plate capacitor of plate area A and separation d is connected to a battery of constant voltage V. Initially it is filled with air. A dielectric slab of thickness d/2 and dielectric constant k is then fully inserted between the plates, leaving the other half d/2 as air. Which expression gives the new capacitance new C_new  ?

A solid sphere of radius R carries a uniform charge Q distributed throughout its volume. What is the potential difference between the center and the surface of the sphere, center surface V_center − V_surface , relative to infinity?

A battery of emf  E = 12 V and internal resistance r = 1Ω is connected to a network consisting of a 5Ω resistor in series with a parallel combination of 10Ω and 15Ω. What is the power dissipated in the 15Ω resistor?

For a circular coil of radius R carrying current I, the magnetic field at a point on its axis at distance x from the center is proportional to:

For a purely resistive AC circuit, the phase difference between the voltage and current is:

Which of the following is a state variable in thermodynamics?

An alternating emf is given by E(t) = 220 sin ⁡(100πt)V and is applied across a pure resistor of resistance R = 110Ω. What is the average power (in watts) dissipated in the resistor ?

A prism has refracting angle A = 60^∘ and refractive index μ = √3. A ray is incident on the first face at angle i = 60^∘.

What is the angle of deviation δ produced by the prism?

What is the approximate radius of a uranium nucleus (A = 238)?