A pinhole camera is placed 300m in front of a building so that the image is formed on a screen 5cm from the the pinhole. If the image is 2.5cm high, the height of the building will be

• A. 25m
• B. 50m
• C. 100m
• D. 150m

A student found out from a simple pendulum experiment that 20 oscillations were completed in 38 seconds. What is the period of oscillation of the pendulum?

• A. 8.0s
• B. 3.8 s
• C. 2.0 s
• D. 1.9 s

A given mass of gas at a temperature of 30°C is trapped in a tube of volume V. Calculate the temperature of the gas when the volume is reduced to two-third of its original value by applying a pressure twice the original value.

• A. 71°C
• B. 40°C
• C. 131°C
• D. 313°C

Which of the following are true about the infra-red radiation? i. it is invisible ii. it is called heat ray iii. its frequency is higher than that of blue light iv. it travels as a transverse wave

• A. i, ii, iii and iv
• B. i, ii, iv only
• C. i, iii, iv only
• D. ii, iii, iv only

A temperature scale has a lower fixed point of 40mm and a upper fixed point of 200mm. What is the reading on this scale when a thermometer reads 60^oC?

• A. 33.3mm
• B. 36.0mm
• C. 96.0mm
• D. 136.0mm

The resultant force of a couple is ………?

• A. Infinity
• B. Zero
• C. One
• D. Half

Mr. F. Abioye observed his image through a plane mirror, kept at a distance 4.7m away from him in his room. At what distance is the image found from Abioye's eye?

• A. 9.4m
• B. 7.5m
• C. 5.7m
• D. 6.9m

Ripple in a power supply unit is caused by

• A. using an alternating current source
• B. forward voltage drop
• C. heavy load
• D. using a zener diode

Which of the following statements about the universal gravitational constant, G, is true?

• A. It is fundamental quantity.
• B. It has dimension M^-1L³T^-2
• C. Its S.I. unit is N m²kg
• D. It is a vector quantity

An object is projected for the hieght of 80 m above the ground with a velocity of 40ms^-1 at the angle of 30^° to the horizontal. The time of flight

• A. 8 s
• B. 4 s
• C. 16 s
• D. 10 s