- A body is moving in a circular path with acceleration a. If its velocity gets doubled then find the ratio of acceleration after and before the change of velocity ?
(A) 1:4 (B)1:2 (C) 2:1 (D) 4:1
Ans : D
- For which of the following metals, the resistance decreases on increasing the temperature ?
(A) Copper (B) Tungsten (C) Germanium (D) Aluminium
Ans : C
- A charge moves in a circle perpendicular to a magnetic field.Upon which of the following, the time period of revolution, does not depend ?
(A) Magnetic field (B) Charge (C) Mass of the particle (D) Velocity of the particle
Ans : D
- The electrical circuit, used to get smooth dc output from a rectifier circuit is called ________.
(A) Oscillator (B) Filter (C) Amplifier (D) Logic gate
Ans : B
- Two bodies of 2 Kg & 4 Kg are moving with velocities 20 m/s and 10 m/s respectively towards each other under mutual gravitational attraction. Find the velocity of their centre of mass in m/s
(A) 4 (B) 9 (C) 6 (D) Zero (0)
Ans : D