A cell of 1.5 V is connected across an inductor of 2 mH in series with a 2Ω resistor. The rate of growth of current immediately after the cell is switched ON, is
The element used for radioactive carbon dating for more than 56000 years is
1 Crore+ students have signed up on EduRev. Have you? Download the App |
A free body of mass 8 kg is travelling at 2 mts per second in a straight line. At a certain instant, the body splits into two equal parts due to internal explosion which releases 16 joules of energy. Neither part leaves the original line of motion finally
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
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
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
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
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 ]
1 videos|1 docs|68 tests
|
1 videos|1 docs|68 tests
|