SRMJEE Mock Test (Med) - 8 - JEE MCQ
30 Questions MCQ Test - SRMJEE Mock Test (Med) - 8
The force required to keep a body in uniform circular motion is
A step up transformer has transformation ratio of 3:2. What is the voltage in secondary if voltage in primary is 30 V
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Half-life of a substance is 10 years. In what time, it becomes 1/4th part of the initial amount
A heavy steel ball of mass greater than 1Kg moving with a speed of 2ms-1 collides head on with a stationary ping pong ball of mass less than 0.1g. The collision is elastic. After the collision the ping pong ball moves approximately with a speed
Three resistors each of 2 ohm are connected together in a triangular shape. The resistance between any two vertices will be
A source of light is placed at a distance of 1 m from a photocell and the cut off potential is found to be V₀. If the lamp is now replaced at a distance of 2 m, the cut off potential will become
A copper wire of length 4.0m and area of cross-section 1.2 cm2 is stretched with a force of 4.8 X 103N. If Young's modulus for copper is 1.2 X 1011N/m2, the increase in the length of the wire will be
The impurity atoms with which pure silicon should be doped to make a p-type semiconductor are those of
A circular ring of area of 0.5 m2 is situated in a non-uniform magnetic field of 4 T changing in 2 s and making an angle of 60o with the magnetic field. The magnitude of the induced e.m.f. will be
When a dielectric material is kept in between the plates of a condenser, its capacity
A body of mass 60 kg is pushed with just enough force to start it moving on a rough surface with μ s = 0.5 and μ k = 0.4 and the force continues to act afterwards, the acceleration of the body is
A heat flux of 4000 J/s is to be passed through a copper rod of length 10 cm and area of cross-section 100 cm2. The thermal conductivity of copper is 400 W/m oC. The two ends of this rod must be kept at a temperature difference of
If an oxygen molecule and a hydrogen molecule is having same temperature, then the ratio of their average kinetic energies will be
A ball of mass 150 g moving with an acceleration 20 m−s-1 is hit by a force, which acts on it for 0.1 s. The impulsive force is
The magnetic dipole moment of a current loop is independent of
The susceptibility of magnetic substance for different purposes is determined by its
Water is flowing over a fixed horizontal surface. If the velocity gradient at a distance 10 cm above the surface is 2 s-1, then velocity of layer will be
a balloon is at a height of 8l m and is ascending upwards with a velocity of 12 m/s. A body of 2 kg weight is dropped from it. If g = 10m/s2, the body will reach the surface of the earth in
A body of mass 0.4 kg is whirled in a vertical circle making 2 rev/sec. If the radius of the circle is 2 m, then tension in the string when the body is at the top of the circle, is
A body weighs 8 gm when placed in one pan and 18 gm when placed on the other pan of a false balance. If the beam is horizontal when both the pans are empty, the true weight of the body is
A particle is viberating in a simple harmonic motion with an amplitude of 4 cm. At what displacement from the equilibrium position, is its energy half potential and kinetic ?
A big drop of radius R is formed by 1000 small droplets of water, then the radius of small drop is
The height y and the distance x along the horizontal plane of a projectile on a certain planet (with no surrounding atmosphere) are given by y = (8t - 5t2) meter and x = 6t meter, where t is in second. The velocity with which the projectile is projected is
One of the refracting surfaces of a prism of refractive index √2 is silvered. The angle of the prism is equal to the critical angle of a medium of refractive index 2. A ray of light incident on the unsilvered surface passes through the prism and retraces its path after reflection at the silvered face. Then the angle of incidence on the unsilvered surface is
Forces of 1 and 2 units act along the lines x=0 and y=0. The equation of the line of action of the resultant is
If work W is done in blowing a bubble of radius R from a soap solution, then the work done in blowing a bubble of radius 2R from the same solution is
A 25 watt, 220 volt and a 100 watt, 220 volt bulb are connected in parallel acorss a 440 volt line
For a perfect gas, the ratio of volume coefficient of expansion to pressure coefficient is
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