WBJEE Physics Test - 15 - JEE MCQ

If an ammeter is to be used in place of a voltmeter then we must connect with the ammeter a

The kinetic energy needed to project a body of mass m from the earth surface to infinity is

In an A.C. circuit, the current is i=5 sin (100t-π/2) amp and the a.c. potential is V=200 sin (100t) volt. Then, the power consumption is

A 2 μ F condenser is charged to 500V and then its plates are joined through of consistance. The heat produced in the resistance in joules is

A truck, moving on a smooth horizontal surface with a uniform speed ν, carries stone dust. If a mass (dm) of the stone dust from the truck in a time (dt), then force needed to keep the truck moving with uniform speed in horizontal direction, is

Which apparatus is used to protect sensitive galvanometer?

If 1000 droplets each of charge q and radius r are mixed to form a big drop, then the potential of big drop, as compared to small droplet will be

Ampere hour is a unit of

Rate of change of torque τ with deflection θ is maximum for a magnet suspended freely in a uniform magnetic field of induction B, when

A motor cyclist going round in a circular track at constant speed has

A body starts to fall freely under gravity. The distances covered by it in first, second and third second are in ratio

A body is moving with a velocity ν in the east direction. If it travels with the same velocity in the north direction, then resultant velocity of body is

The time period of a simple pendulum is 2 seconds. If length is increased by 4 times, then its period becomes

Two solid pieces, one of steel and the other of aluminium when immersed completely in water have equal weights. When the solid pieces are weighed in air

The size of the nucleus varies as ----- power of the atomic number

In a laboratory four convex lenses L₁ , L₂ , L₃  and L₄  of focal lengths 2, 4, 6 and 8cm, respectively are available. Two of these lenses form a telescope of length 10cm and magnifying power 4. The objective and eye lenses are respectively

A particle executes simple harmonic motion with an angular frequency and maximum acceleration of 3.5 rad-s^-1 and 7.5 m-s^-1 respectively. Amplitude of the oscillation is

When a body rolls down on a smooth inclined plane, then its potential energy is converted into

Two identical particles move towards eachother with velocity 2ν and ν respectively. The velocity of centre of mass is

On increasing the reverse bias to a large value in a P-N junction diode, current

The energy band gap is maximum in

If a ball of 80 kg mass hits an ice cube and temperature of ball is 100^oC, how much ice becomes water? Specific heat of ball is 0.2 cal/gram.

An ideal heat engine operators in a Carnot cycle between 227^oC and 127^oC. It absorbs 6 kJ of heat at the higher temperature. The amount of heat converted into work is

The physical quantity that has no dimensions is

A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the first minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of slit is

A body of mass 50 kg slides over a horizontal distance of 1 m. If coefficient of friction between their surfaces is 0.2, then work done against friction is