Humidity is used to describe the amount of
- A. air in water vapour
- B. cloud available in the atmosphere
- C. air in equal volume of cloud
- D. water vapour in the amosphere
Which of the following physical qualities affects the saturated vapour pressure of a liquid ?
- A. temperature
- B. volume
- C. mass
- D. density
The amount of heat given out or absorbed when a substance changes its state at a constant temperature is known as
- A. latent heat
- B. heat capacity
- C. specific latent heat
- D. specific heat capacity
The volume of an ideal gas at a pressure of 77cmHg and temperature 60oC is 24cm3. If the temperature and pressure are increased to 98oC
and 81cmhg respectively, calculate the new volume of the gas
- A. 411.5cm3
- B. 267.1cm3
- C. 254.2cm3
- D. 112.7cm3
A given mass of an ideal gas has a pressure of 500Nm-2 at -13ºC. If its volume remains constant. Calculate its pressure at 247ºC.
- A. 25Nm-2
- B. 50Nm-2
- C. 500Nm-2
- D. 1000Nm-2
A resistance thermometer has a resistance of 20\(\Omega\) at 0oC and 85\(\Omega\) at 100oC. If its resistance is 52\(\Omega\)in a medium, calculate the corresponding temperature
- A. 49.2oC
- B. 60.6oC
- C. 80.0oC
- D. 84.7oC
a beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal. [neglect the weight of the beam]
- A. 32.0N
- B. 26.7N
- C. 16.0N
- D. 13.3N
A screw jack with a Tommy bar of length 12cm is used to raise a car through a vertical height of 25cm by turning the Tommy bar through 50 revolutions. Calculate the approximate velocity ratio of the jack [\(\pi = 3.142\)]
- A. 21
- B. 38
- C. 48
- D. 151
A simple machine with an efficiency of 75% lifts a load of 5000N when a force of 500N is applied to it. Calculate the velocity ratio of the machine
- A. 10.0
- B. 13.3
- C. 17.5
- D. 25.0
Electrical resistance is a property of an electrical energy to be converted into
- A. mechanical energy
- B. heat energy
- C. magnetic energy
- D. chemical energy
Which of the following statements about elastic collision is correct?
- A. momentum is lost due to the sound produced
- B. loss of momentim is equal to loss in kinetic energy
- C. both kinetic energy and momentum are conserved
- D. kinetic energy is lost while momentum is conserved
The time rate of change of momentum is
- A. impulse
- B. force
- C. power
- D. pressure
The amplitude of a particle executing simple harmonic motion in 5cm while its angular frequency is 10 rad s-1. calculate the magnitude of the maximum acceleration of the particle
- A. 0.25ms-2
- B. 0.50ms-2
- C. 2.00ms-2
- D. 5.00ms-2
The amplitude of the motion of a body performing simple harmonic motion decreases with time because
- A. friction force dissipate the energy of motion
- B. the frequency of oscillation varies with time
- C. the period of oscillation varies with time
- D. energy is supplied by some external agency
Which of the following equations represents the distance x, travelled by a body moving on a straight road with a constant speed? [The other symbol have their usual meanings]
- A. x = Ut + \(\frac{1}{2}t^2\)
- B. x = Ut
- C. x = \(\frac{V^2 - U^2}{2a}\)
- D. x = -\(\frac{1}{2} at^2\)
A block weighing 15N rests on a flat surface and a horizontal force of 3N is exerted on it. Determine the friction force on the block
- A. 0.3N
- B. 0.5N
- C. 3.0N
- D. 5.0N
The apparent weight of a body fully immersed in water is 32N and its weight in air is 96N. Calculate the volume of the body. [Density of water = 1000kgm-3, g = 10ms-2]
- A. 8.9 x 10-3m3
- B. 6.4 x 10-3m3
- C. 3.2 x 10-3m3
- D. 3.0 x 10-3m3
Which of the following statements about pressure is not correct? pressure
- A. increases with an increase in surface area
- B. decreases with an increase in surface area
- C. increases with a decrease in surface area
- D. increases with an increase in the applied force
An object weight 10N immersed in a liquid displaces a quantity of the liquid. If the liquid displaced weighs 6N, determine the upthrust of the object
- A. 20N
- B. 10N
- C. 6N
- D. 4N
A spring balance,which is suspended from the roof of a lift, carries a mass of 1kg at its free end. If the lift accelerates upwards at 2.5ms-2, determine the reading on the spring balance. [g = 10ms-2]
- A. 24.0N
- B. 12.5N
- C. 7.5N
- D. 4.0N
Which of the following physical processes cannot be explained by the molecular theory of matter?
- A. evaporation
- B. thermal conduction
- C. radiation of heat
- D. convectional current of fliuds