The temperature at which the water vapour present in the air is just sufficient to saturate air is
- A. Boiling point
- B. Ice point
- C. Saturation point
- D. Dew point
The melting point of a substance is equivalent to its
- A. Vapour Pressure
- B. Solidification Temperature
- C. Liquidification Temperature
- D. Solidification Pressures
The quantity of heat needed to raise the temperature of a body by 1K is the body’s
- A. Heat capacity
- B. Internal energy
- C. Specific heat capacity
- D. Latent heat of fusion
The equation PaVbTc= constant reduces to Charles Law if
- A. a=1, b=1and c=0
- B. a=1, b=0 and c=-1
- C. a=0, b=1 and c=1
- D. a=0, b=1 and c=-1
What is the equivalent of 20K in Celsius scale?
- A. -253oC
- B. -293oC
- C. 68oC
- D. 36oC
The small droplets of water that form on the grass in the early hours of the morning is
- A. Fog
- B. Haul
- C. Mist
- D. Dew
A force of 500N1 is applied to a steel wire of cross-sectional area 0.2m2, The tensile stress is
- A. 2.5x104Nm-2
- B. 1.0x102Nm-2
- C. 1.0x103Nm-2
- D. 2.5x103Nm-2
A wheel and an axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is
- A. 90%
- B. 80%
- C. 85%
- D. 87%
A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put in to the machine if it has a Velocity ratio of 4.
- A. 343.32N
- B. 233.33N
- C. 333.33N
- D. 334.33N
The energy in the nucleus of atoms produce heat which can be used to generate
- A. Kinetic energy
- B. Mechanical energy
- C. Electrical energy
- D. Potential energy
An object of mass 20kg is released from a height of 10m above the ground level. The kinetic energy of the object just before it hits the ground is
- A. 200J
- B. 4000J
- C. 2000J
- D. 500J
What happens when three coplanar non-parallel forces are in equilibrium?
- A. Their lines of action are parallel.
- B. They are represented in magnitude only
- C. They are represented in direction only
- D. Their lines of action meet at a point
One of the conditions necessary for an object to be in equilibrium when acted upon by a number of parallel forces is that the vector sum of the forces is
- A. Average
- B. Zero
- C. Negative
- D. Positive
An object of weight 8kg on earth is taken to a planet where acceleration due to gravity is one-third of its value on earth. The weight of the object on the planet is
- A. 48N
- B. 12N
- C. 27N
- D. 36N
Calculate the escape velocity of a satellite launched from the earth’s surface if the radius of the earth is 6.4×106m
- A. 25.3kms-1
- B. 4.2kms-1
- C. 4.0kms-1
- D. 11.3kms-1
A car accelerates uniformly from rest at 3ms-2. its velocity after traveling a distance of 24m is
- A. 12ms-1
- B. 144ms-1
- C. 72ms-1
- D. 36ms-1
Which type of motion do the wheels of a moving car undergo?
- A. Vibratory and translational motion
- B. Random and translational motion
- C. Rotational mand oscillatory motion
- D. Translational and rotational motion
I Electrical potential, II Torque, III Kinetic Energy, IV Momentum. Which of the quantities listed are vectors?
- A. II and IV
- B. I and II
- C. I and III
- D. II and III
A quantity which requires magnitude and direction to be specified is
- A. Temperature
- B. Distance
- C. Displacement
- D. Mass
What is the least possible error encountered when taking measurement with a meter rule?
- A. 0.1mm
- B. 1.0mm
- C. 0.5mm
- D. 0.2mm