Physics Test - ...

A transformer has an efficiency of 80%. It is connected to a power input of 4 kW and 100 V. if the secondary voltage is 240 V, then the secondary current is.

A particle is projected from point A towards a building of height h as shown at an angle of 60 ° with horizontal. It strikes the roof of building at B at an angle of 30 ° with the horizontal. The speed of projection is

A sonometer wire resonates with a given tuning fork forming stationary waves with 5 antinodes, between 2 bridges, when a mass of 9 kg is suspended from the wire. When the mass is replaced by another mass m, the wire with the same tuning fork forms three antinodes, for the same position of the bridges. The value of m is...

Velocity of a particle moving in a curvilinear path in a horizontal X Y plane varies with time as \(\vec{v}=\left(2 t \widehat{i}+t^{2} \widehat{j}\right)\)m/s. Here, t is in second. Then at t=1 second-

A rod of mass M and length l is at rest on plane horizontal smooth surface. A particle of same mass M strike one end with velocity u perpendicular to rod, elastically. Now just after collision what is the kinetic energy of upper half part of rod.

A planet of core density 3ρ and outer curst of density ρ has small tunnel in core. A small Particle of mass m is released from end A then time required to reach end B :

In the figure as shown, a triangular portion is cut from a circular disc of radius R. The distance of centre of mass of the remaining part from the centre of disc is

In a damped oscillator the amplitude of vibrations of mass m = 150 grams falls by 1/e times of its initial value in time t₀ due to viscous forces. The time t₀ and the percentage loss in mechanical energy during the above time interval t₀ respectively are (Let damping constant be 50 grams/s)

The maximum current in a galvanometer can be 10 mA. It’s resistance is 10Ω. To convert it into an ammeter of 1 Amp. A resistor should be connected in...