BITSAT Practice Test - 17 - JEE MCQ

The positron was discovered in the year

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

A nucleus ruptures into two nuclear parts which have their velocity ratio equal to 2:1. What will be the ratio of their nuclear radius

Which of the following statements is correct

A uniform chain of length 'L' hangs partly from a table which is kept in equilibrium by friction. The maximum length that can stand without slipping is l then coefficient of friction between the table and the chain is

A series combination of R,L,C is connected to an a.c. source. If the resistance is 3Ω and the reactance is 4Ω, the power factor of the circuit is

An electric dipole has the magnitude of its charge as q, and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, then force acting on it and its potential energy are respectively

If r represents the radius of the orbit of the satellite of mass m moving around the planet of mass M, then velocity of the satellite ν is obtained from the relation

An infinite number of charge of equal magnitude q, but of opposite sign are placed along the X-axis at x = 1, x = 2, x = 4, x = 8... and so on. The electric potential at the point x = 0 due to these charge will be

At constant volume the specific heat of a gas is 3R/2, then the value of 'γ' will be

Newton's law of cooling holds good only, if the temperature difference between the body and its surrounding is

A proton and an electron both moving with the same velocity ν enter into a region of magnetic field directed perpendicular to the velocity of the particles. They will now move in circular orbits such that

The material used for permanent magnet should have

The surface tension of soap solution is 25*10⁻³ N-m⁻¹. The excess pressure inside a soap bubble of diameter 1 cm is

The normal density of gold is ρ and its bulk modulus is K. The increase in density of a lump of gold, when a pressure P is applied uniformly on all sides, is

The co-ordinates of a moving particle at any time 't' are given by x = αt³ and y = βt³. The speed of the partcle at time 't' is given by

A hollow sphere has radius 6.4 m. Minimum velocity required by a motor cyclist at bottom to complete the circle will be

A man throws balls with the same speed vertically upwards one after the other at an interval of 2 seconds. What should be the speed of the throw so that more than two balls are in the sky at any time? (Given g = 9.8 m/s)

A solid of density ρ₁ is floating in a liquid of density ρ₂. If ν is the volume of solid submerged in the liquid and V is the total volume of the solid, the ν/V is equal to

A body of mass 2 kg has an initial velocity of 3 metres per second along OE and it is subjected to a force of 4 N in a direction perpendicular to OE. The distance of the body from O after 4 seconds will be

The normal magnifying power of a simple microscope is 6. The focal length of the convex lens used is

Two simple pendulums of length 0.5 m and 20 m respectively are given small linear displacement in one direction at the same time. They will again be in the phase when the pendulum of shorter length has completed... oscillations

A convex lens has a focal length f. It is cut into two parts along a line perpendicular to principal axis. The focal length of each part will be

A dics of radius 1 m is rotating with an angular velocity of 10 rad-s⁻¹. The linear velocity of the dics on a point 0.5 m from its centre is

To make the frequency double of a spring oscillator, we have to

A man is sitting with folded hands on a revolving table. Suddenly, he stretches his arms. Angular speed of table would

The current inside a copper voltameter