What is the least possible error encountered when taking measurement with a meter rule?
Trả lời
(C)
0.5mm
2
A quantity which requires magnitude and direction to be specified is
Trả lời
(C)
Displacement
3
I Electrical potential, II Torque, III Kinetic Energy, IV Momentum. Which of the quantities listed are vectors?
Trả lời
(A)
II and IV
4
Which type of motion do the wheels of a moving car undergo?
Trả lời
(D)
Translational and rotational motion
5
A car accelerates uniformly from rest at 3ms-2. its velocity after traveling a distance of 24m is
Trả lời
(A)
12ms-1
6
Calculate the escape velocity of a satellite launched from the earth's surface if the radius of the earth is 6.4x106m
Trả lời
(D)
11.3kms-1
7
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
Trả lời
(C)
27N
8
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
Trả lời
(B)
Zero
9
What happens when three coplanar non-parallel forces are in equilibrium?
Trả lời
(D)
Their lines of action meet at a point
10
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
Trả lời
(C)
2000J
11
The energy in the nucleus of atoms produce heat which can be used to generate
Trả lời
(C)
Electrical energy
12
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.
Trả lời
(C)
333.33N
13
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
Trả lời
(B)
80%
14
A force of 500N1 is applied to a steel wire of cross-sectional area 0.2m2, The tensile stress is
Trả lời
(D)
2.5x103Nm-2
15
The small droplets of water that form on the grass in the early hours of the morning is
Trả lời
(D)
Dew
16
What is the equivalent of 20K in Celsius scale?
Trả lời
(A)
-253oC
17
The equation PaVbTc= constant reduces to Charles Law if
Trả lời
(D)
a=0, b=1 and c=-1
18
The quantity of heat needed to raise the temperature of a body by 1K is the body's
Trả lời
(A)
Heat capacity
19
The melting point of a substance is equivalent to its
Trả lời
(B)
Solidification Temperature
20
The temperature at which the water vapour present in the air is just sufficient to saturate air is
Trả lời
(D)
Dew point
21
Heat transfer by convection in a liquid is due to the
Trả lời
(D)
Expansion of the liquid as it is heated
22
The distance between two successive crests of a wave is 15cm and the velocity 300ms-1. Calculate the frequency.
Trả lời
(C)
2.0x103Hz
23
A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill? [ speed of sound in air = \(340ms^{-1}\)
Trả lời
(C)
136m
24
An object is placed 10m from a pinhole camera of length 25cm. Calculate the linear magnification.
Trả lời
(B)
2.5x10-2
25
The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it, the image is at
Trả lời
(A)
2.7m
26
In a compound microscope, the objective and the eye piece focal lengths are
Trả lời
(C)
Short
27
When a telescope is in normal use, the final image is at
Trả lời
(A)
Infinity
28
When a negatively charged rod is brought near the cap of a charged gold leaf electroscope which has positive charges, the leaf
Trả lời
(B)
Collapses
29
What charge is stored in a 0.1F capacitor when a 10V supply is connected across it?
Trả lời
(A)
1C
30
The maximum power transfer occur in a cell when the external resistance is
Trả lời
(B)
The same as the internal resistance of the cell
31
A circuit has a resistance of 200Ω. The resistance of the circuit can be reduced to 120Ω when
Trả lời
(A)
A 300Ω resistor is connected to it in parallel
32
PHCN measures its electrical energy in
Trả lời
(B)
KWh
33
What is the best method of demagnetizing a steel bar magnet?
Trả lời
(D)
Solenoid method
34
The magnitude of the angle of dip at the equator is
Trả lời
(B)
0o
35
When an atom undergoes a beta decay, the atomic number of the nucleus
Trả lời
(C)
Increases by one
36
Calculate the mass of the copper deposited during electrolysis when a current of 4A passes through a copper salt for 2 hours. [Ece of Copper z=3.3x10-7kgC-1]
Trả lời
(C)
9.5x10-3kg
37
Which gas produces a red coloured light in a discharge tube?
Trả lời
(D)
Neon
38
Which of the following is NOT a Fundamental S.I unit?
Trả lời
(C)
Newton
39
When \(^{210}_{82}Pb\) decays to \(^{206}_{80}Pb\), it emits
Trả lời
(B)
an alpha particle
40
What type of reaction is represented by the equation \(^{2}_{1}X+^{2}_{1}X\rightarrow^{3}_{2}Y+^{1}_{0}n+Energy\)
