What is the least possible error encountered when taking measurement with a meter rule?
отговор
(C)
0.5mm
2
A quantity which requires magnitude and direction to be specified is
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(C)
Displacement
3
I Electrical potential, II Torque, III Kinetic Energy, IV Momentum. Which of the quantities listed are vectors?
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(A)
II and IV
4
Which type of motion do the wheels of a moving car undergo?
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(D)
Translational and rotational motion
5
A car accelerates uniformly from rest at 3ms-2. its velocity after traveling a distance of 24m is
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(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
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(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
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(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
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(B)
Zero
9
What happens when three coplanar non-parallel forces are in equilibrium?
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(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
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(C)
2000J
11
The energy in the nucleus of atoms produce heat which can be used to generate
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(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.
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(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
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(B)
80%
14
A force of 500N1 is applied to a steel wire of cross-sectional area 0.2m2, The tensile stress is
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(D)
2.5x103Nm-2
15
The small droplets of water that form on the grass in the early hours of the morning is
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(D)
Dew
16
What is the equivalent of 20K in Celsius scale?
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(A)
-253oC
17
The equation PaVbTc= constant reduces to Charles Law if
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(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
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(A)
Heat capacity
19
The melting point of a substance is equivalent to its
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(B)
Solidification Temperature
20
The temperature at which the water vapour present in the air is just sufficient to saturate air is
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(D)
Dew point
21
Heat transfer by convection in a liquid is due to the
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(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.
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(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 = \(340ms^{-1}\)
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(C)
136m
24
An object is placed 10m from a pinhole camera of length 25cm. Calculate the linear magnification.
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(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
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(A)
2.7m
26
In a compound microscope, the objective and the eye piece focal lengths are
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(C)
Short
27
When a telescope is in normal use, the final image is at
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(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
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(B)
Collapses
29
What charge is stored in a 0.1F capacitor when a 10V supply is connected across it?
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(A)
1C
30
The maximum power transfer occur in a cell when the external resistance is
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(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
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(A)
A 300Ω resistor is connected to it in parallel
32
PHCN measures its electrical energy in
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(B)
KWh
33
What is the best method of demagnetizing a steel bar magnet?
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(D)
Solenoid method
34
The magnitude of the angle of dip at the equator is
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(B)
0o
35
When an atom undergoes a beta decay, the atomic number of the nucleus
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(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]
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(C)
9.5x10-3kg
37
Which gas produces a red coloured light in a discharge tube?
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(D)
Neon
38
Which of the following is NOT a Fundamental S.I unit?
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(C)
Newton
39
When \(^{210}_{82}Pb\) decays to \(^{206}_{80}Pb\), it emits
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(B)
an alpha particle
40
What type of reaction is represented by the equation \(^{2}_{1}X+^{2}_{1}X\rightarrow^{3}_{2}Y+^{1}_{0}n+Energy\)
