Physics Test 21...

The phase difference between the alternating current and emf is π/2. Which of the following cannot be the constituent of the circuit?

If a wire is stretched to make it 0.1% longer, its resistance will

Statement-1: For a mass M kept at the centre of a cube of side a, the flux of gravitational field passing through its sides is 4πGM.

Statement-2: If the direction of a field due to a point source is radial and its dependence on the distance r from the source is given as 1/r², its flux through a closed surface depends only on the strength of the source enclosed by the surface and not on the size or shape of the surface

When the current in the portion of the circuit, shown in the figure, is 2 A and is increasing at the rate of 1 A/s, then the measured potential difference V_ab is 8 V. However, when the current is 2 A and is decreasing at the rate of 1 A/s, the measured potential difference V_ab is 4V. The values of R and L are

Identify the wrong statement.

A particle of mass m is at rest at the origin at time t = 0. It is subjected to a force F(t) = F₀e^-bt in the x direction.

Which of the following curves depicts its speed v(t)?

A wire elongates by l mm when a load W is hanged from it. If the wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be (in mm)

Two particles, A and B, of equal masses are suspended from two massless springs of spring constants k₁ and k₂, respectively. If the maximum velocities, during oscillations, are equal, then the ratio of amplitudes of A and B is

At some instant, a particle is moving along a straight line 2x - 3y = 2 and its co-ordinates on that line are (4, 2). Now, at another instant, the same particle is moving along a straight line 3x + 4y = 7 and its co-ordinates are (1, 1). Find the co-ordinates of that axis about which it is in pure rotation.

The amplitude of wave disturbance propagating in the positive x-axis is given by  at t = 2s, where x and y are in metres. The shape of the disturbance does not change during the propagation. The velocity of the wave is