In comparing the camera and the human eye, the film of the camera function as the?
- A. retina
- B. iris
- C. cornea
- D. pupil
During a thunderstorm, the sound is heard over a long time. this phenomenon is referred to as?
- A. diffraction of sound
- B. refraction of sound
- C. superposition
- D. reveraberation
The sound of an electricity bell dies down slowly when air is slowly pumped out from a bottle because
- A. the wavelength of sound becomes greater in the bottle
- B. sound cannot pass through the bottle
- C. sound needs a material medium
- D. sound can pass through a vacuum
The wavelength of a wave traveling with a velocity of 420 ms-1 is 42 m. what is its period?
- A. 1.2 s
- B. 1.0 s
- C. 0.5 s
- D. 0.1 s
Which of the following has no effect on radiation?
- A. nature of surface
- B. density
- C. surface area
- D. temperature
The pressure of one mole of an ideal gas of volume 10-2 m3 at a temperature of 27°c is
[molar gas constant = 8.3 J mol-1 k-1]
- A. 2.49 x 104 Nm-2
- B. 2.24 x 104 Nm-2
- C. 2.49 x 105 Nm-2
- D. 2.24 x 105 Nm-1
A vapor is said to be saturated when?
- A. a dynamic equilibrium exists between liquid molecules and the vapour molecules
- B. a dynamic equilibrium exists such that more molecules return to the liquid than are leaving it
- C. the temperature of the vapour varies
- D. the vapour pressure is atmospheric
The small droplet of water that forms on the grass in the early hours of the morning is
- A. hail
- B. dew
- C. fog
- D. mist
If a container is filled with ice to the brim, what happens to the level of water when the ice completely melts?
- A. the level of water goes up
- B. the water in the glass outflows
- C. the level of water remains unchanged
- D. the level of water drops
Heat is radiated by hot objects in the form?
- A. x-rays
- B. light energy
- C. infrared rays
- D. solar energy
The density of a certain oil on frying becomes 0.4 kgm\(^{-3}\) with the volume of 20m\(^{3}\). what will be its initial volume when its initial density is 0.8 kgm\(^{-3}\) assuming no loss of oil due to spillage?
- A. 12m3
- B. 10m3
- C. 8m3
- D. 5m3
One special advantage of alcohol over mercury as a thermometric liquid is its?
- A. low density
- B. low freezing point
- C. high specific
- D. low boiling point
A hydrometer is an instrument used in measuring?
- A. vapour pressure of a fluid
- B. density of liquid
- C. relative humidity of a liquid
- D. relative density of a liquid
The accurate measurement of the relative density of a substance in its powdered form is done with a beam balance and?
- A. a density bottle
- B. an eureka can
- C. a pipette
- D. a burette
In a hydraulic press, the pump piston exerts a pressure of 100 pa on the liquid. what force is exerted in the second piston of cross sectional area 3 m2?
- A. 300 N
- B. 200 N
- C. 150 N
- D. 100 N
If a wire 30 cm long is extended to 30.5 cm by a force of 300 N. find the strain energy of wire
- A. 0.75 J
- B. 7.50 J
- C. 75.00 J
- D. 750.00 J
A machine of velocity ratio 6 requires an effort of 400 N to raise a load of 800 N through I m. Find the efficiency of the machine
- A. 55. 6 %
- B. 50.0%
- C. 33.3%
- D. 22.2%
The surfaces of conveyor belts are made rough so as to?
- A. protect them while carrying loads
- B. prevent the loads from slipping
- C. enable them to carry more load
- D. make them stronger
A car moves with an initial velocity of 25 ms-1 and reaches a velocity of 45 ms-1 in 10s. what is the acceleration of the car?
- A. 2 ms-2
- B. 5 ms-2
- C. 20 ms-2
- D. 25 ms-2
A stone and a feather are dropped from the same height above the earth surface. Ignoring air resistance, which of the following is correct?
- A. the feather will be blown away by the wind while stone will drop steadily
- B. the stone and the feather will both reach the ground at the same time
- C. the feather will reach the ground first
- D. the stone will reach the ground first
Two cars moving in the same direction have speeds of 100 kmh-1 and 130 kmh-1 what is the velocity of the faster car as measured by an observer in the slower car?
- A. 30 kmh-1
- B. 130 kmh-1
- C. 200 kmh
- D. 230 kmh-1