A tuber of cassava can be processed into powder. This explains the face that
Хариулт
(D)
matter is made up of tiny particle
2
A piece of metal of relative density 5.0 weighs 60N in air. Calculate its weight when fully immersed in water
Хариулт
(C)
48N
3
The tendency of a body to remain at rest when a force is supplied to it is called
Хариулт
(C)
inertia
4
A force acts on a body for 0.5s changing its momentum from 16.0kg ms-1 to 21.0kgms-1, calculate the magnitude of the force
Хариулт
(D)
10.0N
5
A moving object is said to have a uniform acceleration if its
Хариулт
(C)
velocity increases by equal amount in equal time intervals
6
The period of an oscillatory motion is defined as the
Хариулт
(C)
time to complete one oscillation
7
The mass on a loaded spiral spring oscillates vertically between two extreme positions P and R equidistant from the equilibrium position Q. Which of the following statements about the system is not correct
Хариулт
(D)
the total energy of the system is always constant
8
A ball f mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms-1. Determine the magnitude of the resulting impulse
Хариулт
(B)
10.0kgms-1
9
Which of the following statements correctly defines a simple machine? a device
Хариулт
(C)
with which work can be done easily
10
A platinum resistance thermometer has a resistance 4\(\Omega\) at 0oC and 10\(\Omega\) at 100oC. Assuming the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45oC.
Хариулт
(B)
6.7\(\Omega\)
11
A metal rod of length 100cm is heated through 100ºC, calculate the change in length of the rod [linear expansivity of the material of the rod is 3 x 10\(^{-5}\)K\(^{-1}\)]
Хариулт
(B)
3mm
12
The heat capacity of a calorimeter is the amount of energy required to
Хариулт
(C)
change the temperature of the calorimeter
13
Which of the following statement about latent heat of vaporization is correct? It
Хариулт
(B)
breaks completely the force of attraction completely between the molecules of a liquid
14
When the pressure of a fixed mass of gas is doubled at constant temperature, the volume of the gas is
Хариулт
(D)
halved
15
The volume of a given mass of an ideal gas at 327k and 9.52 x 104 Pa is 40cm3. calculate the volume of the gas at 273k and 1.034 x 105Pa.
Хариулт
(D)
30.75cm3
16
A wave of weight length 0.30m travels 900m in 3.0s, calculate its frequency
Хариулт
(C)
1000Hz
17
Which of the following condition is necessary for the occurrence of total internal reflection of light?
Хариулт
(C)
the angle of incidence must be greater than the critical angle
18
The image which cannot be formed on a screen is said to be
Хариулт
(D)
virtual
19
An object is placed on the principal axis and at the centre of curvature of a concave mirror, the image of the image formed by the mirror is
Хариулт
(B)
real and inverted
20
A converging lens produces an image four times as large as an object placed 25cm from the lens. Calculate its focal length
Хариулт
(D)
20cm
21
The horizontal floor of a water reservoir appears to be 1.0m deep when viewed vertically from above. If the refractive index of water is 1.35, calculate the real depth of the reservoir
Хариулт
(B)
1.35m
22
A converging lens has a focal length of 5cm. Determine its power
Хариулт
(A)
+20.0
23
Which of the following pairs of rays shows the widest separation in the spectrum of white light?
Хариулт
(B)
orange and indigo
24
Which of the following statements about the human eye and the camera is correct?
Хариулт
(C)
the inside of both of them is blackened to absorb unwanted light
25
The speed of sound in air is is directly proportional to
Хариулт
(D)
the square roor of its temperature on the absolute scale
26
A sonometer wire of linear density 0.08kg m-1 subjected to a tension of 800N is plucked. Calculate the speed of a pulse which moves from one end of the wire to the other
Хариулт
(B)
100.0ms-1
27
Which of the following instruments gives a pure note when sounded?
Хариулт
(C)
tunning fork
28
Which of the following features of an electrostatic line of force is not correct?
Хариулт
(D)
it can cross another line of force in a region of intense electric field
29
Which of the following statement about force is correct ?
Хариулт
(C)
fields are real but their corresponding field lines are imaginary
30
A positively charged glass rod is placed by near the cap of a positively charge electroscope. The divergence of the leaf is observed to
Хариулт
(B)
increase
31
Two identical cells each of e.m.f 2v and internal resistance 1.0\(\Omega\) are connected in parallel. The combination is connected to an external load of 1.5\(\Omega\). Calculate the current in the circuit
Хариулт
(B)
1.00A
32
Which of the following factors does not affect the the electric resistance of a wire?
Хариулт
(B)
mass
33
A current of 10A passes through a conductor for 10s, calculate the charge flowing through the conductor
Хариулт
(A)
100.0C
34
A lamp is rated 240V 60W, calculate the resistance of its filament
Хариулт
(C)
960\(\Omega\)
35
The maximum power dissipated by a 100\(\Omega\) resistor in a circuit is 4W. Calculate the voltage across the resistor
Хариулт
(B)
20V
36
One difference between a reactance and a resistance in an alternating current circuit is
Хариулт
(D)
the current in a reactance is lower than in the resistance
37
The direction of induced current in a straight wire placed in magnetic field is determined by using?
Хариулт
(D)
Lenz's law
38
Which of the following statements about an electromagnet is not correct?
Хариулт
(D)
it has permanent poles
39
Which of the following statements is not true of the isotopes of an element? They
Хариулт
(D)
have the same mass number
40
Which of the following statements is true of ultra violet radiations? It
Хариулт
(C)
is an electromagnetic wave
41
A radioactive element has a decay constant of 0.077s-1, calculate its half life
Хариулт
(B)
9.0s
42
The minimum energy required to remove an electron from an atom is known as
Хариулт
(B)
ionization energy
43
Nuclear fission is preferred to nuclear fusion in the generation of energy because?
Хариулт
(A)
very high temperature are required for fusion
44
Which of the following reactions represents nuclear fusion?
Хариулт
(A)
\(^2_1H + ^2_1H \to ^3_2He + ^1_0n\)
45
The diagram above shows the resultant electric field pattern due to two electric point charges P and S. Which of the following statements is correct?
