Practice Test - Physics 18 for JEE & BITSAT Exams

Question 1

In an LCR series a.c. circuit, the voltage across each of the components, L, C and R is 50 V. The voltage across the LC combination will be

Question 2

A nuclear transformation is denoted by X(n, α)

. Which of the following is the nucleus of element X?

Question 3

This question has statement 1 and statement 2. Of the four choices given after the statements, choose the one that best describes the two statements
Statements 1: Davisson – germer experiment established the wave nature of electrons
Statement 2: If electrons have wave nature, they can interfere and show diffraction.

Question 4

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the length and radii of the wires are in the ratio of 4/3 and 2/3, then the ratio of the currents passing through the wire will be

Question 5

Two spherical conductors A and B of radii 1 mm and 2 mm are separated by a distance of 5 cm and are uniformly charged. If the spheres are connected by a conducting wire then in equilibrium condition, the ratio of the magnitude of the electric fields at the surfaces of spheres A and B is

Question 6

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

Question 7

Gravitational potential due to a mass distribution is given by V = (x²y + y²z) . The gravitational field can be expressed as

Question 8

A body of mass m is accelerated uniformly from rest to speed v in total time T. The Instantaneous power delivered to the body as a function of time(t) is given by

Question 9

On heating water, bubbles being formed at the bottom of the vessel detach and rise. Take the bubbles to be spheres of radius R and making a circular contact of radius r with the bottom of the vessel. If r < < R. and the surface tension of water is T, value of r just before bubbles detach is : (density of water is r_w)

Question 10

A pendulum made of a uniform wire of cross sectional area A has time period T. When an additional mass M is added to its bob, the time period changes to T_M. If Young’s modulus of the material of the wire is Y then

is equal to:
(g = gravitational acceleration )