The electromagnetic waves that are sensitive to temperature changes are

• A. X-rays
• B. Gamma-rays
• C. Ultra-violet rays
• D. Infra-red rays

The following are the scores of ten students in a test of 20 marks: 15, 16, 17, 13, 16, 8, 5, 16, 19, 17. What is the modal?

• A. 13
• B. 15
• C. 16
• D. 19

In a meter bridge experiment, two resistor 2\(\Omega\) and 3\(\Omega\) occupy the left and right gaps respectively. Find the balance point from the left side of the bridge

• A. 20cm
• B. 40cm
• C. 60cm
• D. 80cm

In a purely inductive circuit, the current

• A. lags behind the voltage in phase by 90°
• B. leads the voltage in phase by 90°
• C. is in the same phase with the voltage
• D. leads the voltage by 180°

Which of the following with respect to a body performing simple harmonic motion are in phase?

• A. displacement and velocity of the body
• B. displacement and force on the body
• C. velocity and acceleration of the body
• D. force acting on the body and the acceleration

Two 50\(\mu\)F parallel plate capacitors are connected in series. The combined capacitor is then connected across a 100-V battery. The charge on each plate of the capacitor is

• A. 5.00 x 10^-5C
• B. 2.50 x 10^-3C
• C. 1.25 x 10^-3C
• D. 1.00 x 10^-2C

The distance xm travelled by a particle in time t seconds is described by the equation x = 10 + 12t², Find the average speed of the particle between the time interval t = 2s and t = 5s

• A. 60 ms^-1
• B. 72 ms^-1
• C. 84 ms^-1
• D. 108 ms^-1

The power dissipated in an a.c. circuit with an r.m.s, current of 5A, r.m.s voltage of 10V and a phase angle of 60^o is

• A. 25W
• B. 50W
• C. 120W
• D. 125W

Under constant tension and constant mass per unit length, the note produced by a plucked string is 500Hz when the length of the string is 0.90m. At what length is the frequency 150Hz?

• A. 3m
• B. 4m
• C. 5m
• D. 6m

The slope of the straight line displacement-time graph indicates?

• A. distance traveled
• B. uniform velocity
• C. uniform acceleration
• D. uniform speed