SRMJEE Practice Test (Engg) - 10 - JEE MCQ

A particle moves in a circular orbit under the action of a central attractive force inversely proportional to the distance 'r'. The speed of the particle is

A cell supplies a current of 0.9 A through a 2Ω resistor and a current of 0.3 A through a 7Ω resistor. The internal resistance of the cell is

During X-ray formation if voltage is increased

A rod of length l and radius r is joined to a rod of length l/2 and radius r/2 of same material.The free end of small rod is fixed to a rigid base and the free end of larger rod is given a twist of θº, the twist angle at the joint will be

Stack Pointer (SP) alway holds the address of the:

A 5 cm long solenoid having 10 cm resistance and 5 mH inductance is joined to a 10 V battery. At steady state, current through solenoid is

The electrical conductivity of the earth's atmosphere increases with altitude due to

A body of 5 kg weight kept on a rough inclined plane of angle 30⁰ starts sliding with a constant velocity. Then the coefficient of friction is (assume g=10 m/s²)

A body of mass m is taken to the bottom of a deep mine. Then

Two cylinders of equal size are filled with equal amount of ideal diatomic gas at room temperature. Both the cylinders are fitted with pistons. In cylinder A the piston is free to move, while in cylinder B the piston is fixed. When same amount of heat is supplied to both the cylinders, the temperature of the gas in cylinder A raises by 20º K. What will be the rise in temperature of the gas in cylinder B?

A cylinder of 5 L capacity, filled with air at N.T.P. is connected with another evacuated cylinder of 30 L of capacity. The resultant air pressure in both the cylinders will be

A body of mass 1 kg is suspended by a thread. It is (i) lifted up with an acceleration 4.9 m−s⁻².(ii) lowered with an acceleration 4.9 m-s⁻². The ratio of tensions in the thread is

A charge q moves on a region where electric field and magnetic field both exist, then force is

The magnetic field intensity at a point distance 'r' from a short magnet is proportional to

If the radius of a soap bubble is four times that of another, then the ratio of their pressures will be

If ball A is dropped from the top of a building and another ball B is thrown horizontally from the same height at the same moment with the same velocity, then ball

When forces F₁,F₂,F₃ are acting on a particle of mass m such that F₂ and F₃ are mutually perpendicular, then the particle remains stationary. If the force F₁ is now removed then the acceleration of the particle is

Which of the following is a scalar quantity?

The time period of a mass suspended from a spring is T. If the spring is cut into four equal parts and the same mass is suspended from one of the parts, then the new time period will be

A wooden sphere and a metal sphere of the same mass are thrown vertically up in air of density ρ with the same velocity υ m/sec (neglecting the viscous drag of air), then

When the temperature of a gas filled in a closed vessel is increased by 1º C, its pressure increases by 0.4%. The initial temperature of the gas was

Two waves are said to be coherent if they have

An electric motor operators at 20 rev-s⁻¹. What will be the power delivered by the motor, if it supplies a torque of 75 N-m?

The time dependence of a physical quantity p is given by
p=p₀ exp(-α t²). The constant α

A spherical soap bubble has a radius 'r'. The surface tension of the soap film is T. The energy needed to double the diameter of the bubble at the same temperature is

When a current passes through the junction of two different metals, evolution or absorption of heat at the junction is known as

A steel meter scale is to be ruled so that millimeter intervals are accurate within about 5 x 10⁻⁵ mm at a certain temperature. The maximum temperature variation allowable during the ruling is [coefficient of linear expansion of steel = 10 x 10⁻⁶ k⁻¹ ]