SRMJEE Mock Test (Engg) - 7 - JEE MCQ

A mass of 12Kg at rest explodes into two pieces of masses 4Kg and 8Kg which move in opposite directions. If the velocity of 8Kg piece is 6 ms^-1, then the kinetic energy of the other piece in joules is
(Hint : Apply law of conservation of momentum)

A copper wire of resistance R is cut into ten parts of equal length. Two pieces each are joined in series and then five such combinations are joined in parallel. The new combination will have a resistance

The effective value of a.c. in a circuit is 10 A. The peak value of current is

4 eV is the energy of the incident photon and the work function in 2 eV. What is the stopping potential

To keep constant time, watches are fitted with balance wheel made of

The binary number 110000111101 corresponds to a hexadecimal number:

A body of mass 100 g is sliding from an inclined plane of inclination 30º. What is the frictional force experienced if μ=1.7

The force of gravitation is

A charged particle of mass 5 x 10⁻⁶ Kg is held stationary in space by placing it in an electric field of strength 10⁶ NC⁻¹ directed vertically downwards. The charge on the particle is (g = 10ms⁻²)

A black body of surface area 10 cm² is heated to 127ºC and is suspended in a room at temperature 27ºC. The initial rate of loss of heat from the body to the room will be

Mean kinetic energy (or average energy) per gm molecule of a monoatomic gas is given by

A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, then force exerted by the rope on the block is

When a charged particle moves perpendicular to a magnetic field, then

Susceptibility is positive and large for a

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 ball is dropped on to the floor a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 seconds, what is the average acceleration during contact?

Consider the following statements
Assertion (A) : On a rainy day, it is difficult to drive a car or bus at high speed
Reason (R) : The value of coefficient of friction is lowered due to wetting of the surface
Of these statements

A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. by what velocity the gun rebounds backwards

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

An aeroplane is flying at a constant horizontal velocity of 600 km/hr at an elevation of 6 km towards a point directly above the target on the earth's surface. At an appropriate time, the pilot releases a ball so that it strikes the target at the earth. The ball will appear to be falling

In a streamline flows if the gravitational head is h. The kinetic and pressure heads are

A dancer on ice spins faster when she folds her arms. This is due to

A beam of light incident on a plane mirror forms a real image on reflection. The incident beam is

The surface tension of a liquid is 70 dynes/cm. It may be expressed in MKS system as

If pressure at half the depth of a lake is equal to 2/3 pressure at the bottom of the lake then what is the depth of the lake

A constant voltage is applied on a uniform wire, then the heat is produced. The heat so produced will be doubled, if

The pressure of a gas in a closed vessel is increased by 0.4%, if the temperature of the gas is increased by 1º C , the initial temperature of the gas is