Which of the following factors affect the rate of evaporation of a liquid? i. Exposed surface area ii Temperature of the surroundings iii. Thermal capacity of the liquid iv. Relative humidity of the surroundings
- A. ii and iii only
- B. ii, iii and iv only
- C. i, iii and iv only
- D. i, ii amd iv only
Which of the following is used to measure relative humidity?
- A. hydrometer
- B. barometer
- C. hypsometer
- D. hygrometer
When table salt is added to ice, the melting point of the ice
- A. is raised
- B. is lowered
- C. remains unchanged
- D. is first raised, then lowered
It takes 4 minutes to boil a quantity of water using an electrical heating coil. How long will it take to boil the same quantity of water using the same coil if the current is doubled? [Neglect any external heat losses]
- A. 8 minutes
- B. 4 minutes
- C. 2 minutes
- D. 1 minute
as a bicycle Tyre was being pumped up, it was noticed that contrary to Boyle’s law the volume increased as the pressure increased. The best explanation of this is that Boyle’s law is only true for
- A. ideal gases
- B. a fixed mass of gas
- C. a mixture of gases
- D. a gas at variable temperature
A rod of initial lenght 2m at a temperature of 25oC is heated to 80oC. Calculate the increase in length of the rod if its linear expansivity is 4.0 x 10-3K-1
- A. 0.26m
- B. 0.44m
- C. 0.53m
- D. 0.84m
A faulty thermometer registers 102.5oC t 100oC. If the thermometer has no zero hour, what will it register at 55oC?
- A. 54.6oC
- B. 55.0oC
- C. 56.0oC
- D. 56.4oC
A machine of efficiency 80% is used to lift a box. If the effort applied by the machine is twice the weight of the box. Calculate the velocity ratio of the machine
- A. 0.50
- B. 0.63
- C. 0.80
- D. 1.60
A stone of mass 0.5kg is dropped from a height of 12m. Calculate its maximum kinetic energy. [g = 10ms-1]
- A. 3.0J
- B. 6.0J
- C. 30.0j
- D. 60.0J
Electric energy is measured in
- A. ampere
- B. coulomb
- C. kilowatt-hour
- D. kilowatt
A body of mass 5kg movimg with a velocity of 30ms-1 due east is suddenly hit by another body and changes its velocity to 50ms-1 in the same direction. Calculate the magnitude of the impulse received.
- A. 100Ns
- B. 150Ns
- C. 250Ns
- D. 400Ns
The period of a simple pendulum of length 80.0cm was found to have doubled when the length of the pendulum was increased by X. Calculate X.
- A. 26.7cm
- B. 40.0cm
- C. 160.0cm
- D. 240.0cm
Two forces 6N and 8N, act eastwards and northwards respectively on a body. Calculate the magnitude of their equilibrant
- A. 2N
- B. 7N
- C. 10N
- D. 14N
The following properties of a solid are measured on earth i. weight ii. specific heat capacity iii. density. Which of the properties will hav a different value if measured in space?
- A. i only
- B. ii only
- C. iii only
- D. ii and iii only
A moving body accelerates when it?
- A. changes its direction at constant speed
- B. mauntains a constant linear speed
- C. covers equal distances in equal times in a straight line
- D. is acted upon by balanced forces
- E. none of the above
A body moving in a circle at constant speed has i. a velocity tangent to the circle ii. a constant kinetic energy iii. an acceleration directed towards the circumference of the circle. Which of the statements above are correct?
- A. i and ii only
- B. ii and iii only
- C. i and iii only
- D. i, ii and iii
Which of the following types of types of motion will be produced when a pair of equal and opposite non-collinear parallel forces acts on a body?
- A. vibrational motion
- B. random motion
- C. translational motion
- D. rotational motion
A body of volume 0.046m3 is immersed in a liquid of density 980kgm-3 with \(\frac{3}{4}\) of its volume submerged. Calculate the upthrust on the body. [g = 10ms-2]
- A. 11.27N
- B. 33.81N
- C. 112.70N
- D. 338.10N
In a hydraulic press, a force of 40N is applied to the smaller priston of area 10cm2. If the area of the larger piston is 200cm2, calculate the force obtained
- A. 800N
- B. 500N
- C. 80N`
- D. 50N
Which of the following properties of a steel bar can be measured in terms of the dimension of length only?
- A. weight
- B. density
- C. pressure
- D. volume
In which of the following states of matter do the molecules vibrate about their mean positions?
- A. liquids only
- B. solids only
- C. liquids and gasses only
- D. solids, liquids and gases