SRMJEE Mock Test (Engg) - 8 - JEE MCQ

A ball A moving with a speed of 90 ms^-1 collides directly with another identical ball B moving with a speed V in the opposite direction. A comes to rest after the collision. If the coefficient of restitution is 0.8, the speed of B before collision V =

In a discharge tube at 0.2 mm of Hg pressure, there is a formation of

Two electric bulbs A and B rated as 60 W and 100 W. If they are connected in parallel to the same source, then

How much force is required to produce an increase of 0.2% in the length of a brass wire of diameter 0.6 mm (Young's modulus for brass = 0.9 X 10¹¹N/m²)

In a transformer, the number of turns of primary coil and secondary coil are 5 and 4 respectively. If 240 V is applied on the primary coil, then the ratio of current in primary and secondary coil is

The angular velocity of rotation of star at which the matter strat to escape from its equator will be

A crystal oscillator provides a very stable frequency because of

A pulling force making an angle θ to the horizontal is applied on a block of weight W placed on a horizontal table. If the angle of friction is φ, the magnitude of force required to move the body is equal to

The maximum wavelength of radiations emitted at 900 K is 4μm. What will be the maximum wavelength of radiations emitted at 1200 K

The velocity of the molecules of a gas at temperature 120 K is υ. At what temperature will the velocity be 2υ

Two equal charges q each are placed at a distance of 2a. If a third charge-2q is placed at the mid-point, then potential energy of the system is

A satellite in a force-free space sweeps stationary interplanetary dust at a rate (dM/dt)=αν. The acceleration of satellite is

A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is

Most of the substance show which of the following magnetic property?

Rain drops are spherical in shape, because of

A aprticle is dropped from a building . It takes 4 seconds for the particle to reach the ground. Then height of the building is (use g = 10 m/s²)

A ball is thrown upwards and it returns to ground describing a parabolic path. Which of the following remains constant

A body is executing simple harmonic motion with an angular frequency of 2 rad-s⁻¹. The velocity of the body at 20 mm displacement,when amplitude of motion is 60 mm, is

A pulley fixed to the ceilling carries a string with blocks of mass m and 3 m attached to its ends. The masses of string and pulley are negligible. When the system is released. its centre of mass moves with what acceleration

The horizontal range is four times the maximum height attained by a projectile. The angle of projection is

A force 10³ newton stretches the length of a hanging wire by 1 millimetre. The force required to stretch a wire of same material and length but having four times the diameter by 1 millimeter is

A prism of refractive index ' μ ' and angle 'A' is placed in the minimum deviation position. If the angle of minimum deviation is 'A', then the value of 'A' in terms of ' μ ' is

An automobile engine develops 100 kW when rotating at a speed of 1800 rev-min⁻¹. What torque does it deliver?

Newton per square metre is the unit of

The surface tension of a liquid at its boiling point

The heat developed in an electric wire of resistance R by a current I for a time t is

The densities of a liquid at 0º C and 100º C are respectively 1.0127 and 1. A specific gravity bottle is filled with 300 gm of the liquid at 0º C upto the brim and it is heated 100º C . Then the mass of the liquid expelled in grams is [Coefficient of linear expansion of glass = 9 x 10 − 6 ∕  º C ]