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
Answer: C
A quantity which requires magnitude and direction to be specified is
A. Temperature
B. Distance
C. Displacement
D. Mass
Answer: C
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
Answer: A
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
Answer: D
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
Answer: A
V2 = 0 x 2(3)(24)
V2 = 144
V = 144
V = 12ms-1
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
Answer: D
Vescape = 2gR
Vescape = 2×10×6.4×106
Vescape = 128000000
Vescape = 11313.7085mS-1
Vescape = 11.313kmS-1
An object of weight 80kg 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
Answer: C
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
Answer: B
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
Answer: D
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
Answer: C
Kinetic Energy = mgh
= 20 x 10 x 10 J
= 2000J
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
Answer: A
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
Answer: C
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%
Answer: B
Answer: D
Stress=500 / 0.2=2500
= 2.5 x 103Nm-3
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
Answer: D
What is the equivalent of 20K in Celsius scale?
A. 20oC
B. 293oC
C. 68oC
D. 36oC
Answer: B
273 + 20 = 293
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
Answer: D
if a=0, b=1 and c=-1 then
P0V1T-1 = V/T (Charles Law)
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
Answer: A
The melting point of a substance is equivalent to its
A. Vapour Pressure
B. Solidification Temperature
C. Liquidification Temperature
D. Solidification Pressures
Answer: B
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
Answer: D
Heat transfer by convection in a liquid is due to the
A. Latent heat of vaporization of the liquid
B. Increased vibration of the molecules of the liquid about theit mean position
C. Variation of density of the liquid
D. Expansion of the liquid as it is heated
Answer: D
The distance between two successive crests of a wave is 15cm and the velocity 300ms-1. Calculate the frequency.
A. 2.0×102Hz
B. 4.5×103Hz
C. 2.0×103Hz
D. 4.5×102Hz
Answer: C
Wavelength = 15cm = 0.15m
Velocity = 300m/s
V = fx
F = V/Wavelength
F = 300/0.15 Hertz
F = 2 x 103Hz
A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill?
A. 528m
B. 66m
C. 136m
D. 264m
Answer: C
Therefore time for echo in 1 way = 0.8/2 = 0.4
Distance = Speed x time
Distance = 340 x 0.4
Distance = 136m
An object is placed 10m from a pinhole camera of length 25cm. Calculate the linear magnification.
A. 2.5×102
B. 2.5×10-2
C. 2.5×10-1
D. 2.5×101
Answer: B
Linear Magnification = Length of camera/Distance of Object
Linear Magnification = 25/1000
Linear Magnification = 2.5×102
The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it, the image is at
A. 2.7m
B. 2.0m
C. 2.3m
D. 2.5m
Answer: A
1/ 8 + 1/ V= 12
V=8 /3
V=2.7cm
In a compound microscope, the objective and the eye piece focal lengths are
A. At infinity
B. Long
C. Short
D. The same
Answer: C
When a telescope is in normal use, the final image is at
A. Infinity
B. The focus
C. The radius of curvature
D. The near point
Answer: A
When a negatively charged rod is brought near the cap of a charged gold leaf electroscope which has positive charges, the leaf
A. Remains the same
B. Collapses
C. Collapses and diverges again
D. Diverges
Answer: B
Answer: B
What charge is stored in a 0.1F capacitor when a 10V supply is connected across it?
A. 1C
B. 5C
C. 4C
D. 2C
Answer: B
Q = CV = 0.1 x 10 = 1C
The maximum power transfer occur in a cell when the external resistance is
A. Twice the internal resistance of the cell
B. The same as the internal resistance of the cell
C. Greater than the internal resistance of the cell
D. Less than the internal resistance of the cell
