When the bottom tip of a vibrating tuning fork is held in contact with a wooden box, a louder sound is heard. This phenomenon is known as

• A. beats
• B. echoing
• C. resonance
• D. reverberation

A simple pendulum, has a period of 5.77 seconds. When the pendulum is shortened by 3 m, the period is 4.60 seconds. Calculate the new length of the pendulum

• A. 5.23 m
• B. 6.42 m
• C. 4.87 m
• D. 7.26 m

2000cm³ of a gas is collected at 27^oC and 700mmHg. What is the volume of the gas at standard temperature and pressure?

• A. 1896.5cm³
• B. 1767.3cm³
• C. 1676.3cm³
• D. 1456.5cm³

(a) State Hooke's law of elasticity

(b) A spiral spring, loaded with a piece of metal, extends by 10.5cm hair. When the metal is fully submerged in water, the spring extends by 6.8cm. Calculate the relative density of the metal. (Assume Hooke's law is obeyed).

Which process is responsible for production of energy in stars?

• A. Nuclear reaction
• B. Nuclear fission
• C. Nuclear fusion
• D. Radioactive decay

A freely suspended compass needle on the earth's surface settles in a plane called----------

• A. geographic meridian
• B. magnetic meridian
• C. magnetic declination
• D. isoganals

The instrument that measures both ac and dc is called

• A) A current balance
• B) a moving coil ammenter
• C) a moving iron ammeter
• D) an inverter

The driving mirror of a car has a radius of curvature of 1m. A vehicle behind the car is 4m from the mirror. Find the image distance behind the mirror.

• A. 8/7
• B. 4/9
• C. 9/2
• D. 4/7

A pilot records the atmospheric pressure outside its plane as 63cm of Hg while a ground observer records a reading of 75cm of Hg for the atmospheric pressure on the ground. Assuming that the density of the atmosphere is constant, calculate the height of the plane above the ground. (Relative density of Hg = 13.0 and that of air = 0.00013)

• A. 1200m
• B. 6300m
• C. 7500m
• D. 13800m

in a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively, what is the voltage across the capacitor?

• A. 30V
• B. 40V
• C. 50V
• D. 70V