Which is the incorrect formula for a body accelerating uniformly?
Trả lời
(A)
a = v2 − \(\frac{u^2}{2}\)
2
Which of the following is not an electromagnetic radiation?
Trả lời
(D)
sound waves
3
Calculate the electric field intensity between two plates of potential difference 6.5V when separated by a distance of 35cm.
Trả lời
(A)
18.57NC\(^{-1}\)
4
Why do soldiers march disorderly while crossing a bridge?
Trả lời
(A)
To prevent resonance on the bridge
5
Calculate the upthrust on an object of volume 50cm3 which is immersed in liquid of density \(10^{3}\) kgm-3 [g = 10ms-2]
Trả lời
(C)
0.5N
6
Under what conditions are cathode rays produced in a discharge tube?
Trả lời
(D)
Low pressure and high volatge
7
Under which of the following conditions is workdone
Trả lời
(B)
A boy climbs onto a table
8
Calculate the specific latent heat of vaporization of steam of 1.13 x 106J of heat energy is required to convert 15kg of steam to water.
Trả lời
(C)
\(7.53 \times 10^{4}\)Jkg\(^{-1}\)
9
A cell of internal resistance 2Ω supplies current to a 6Ω resistor. The efficiency of the cell is
Trả lời
(D)
75.0%
10
Which of the following statements is NOT correct?
Trả lời
(A)
Molecules of a liquid are stationary
11
A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N, calculate the efficiency of the machine
Trả lời
(C)
66.7%
12
Three 3ω resistance are connected in parallel what is the equivalent resistance?
Trả lời
(A)
1ω
13
Which of the following instruments helps to maintain the correct humidity and temperature of a building?
Trả lời
(D)
Air conditioner
14
An element and its isotope only differ in the number of
Trả lời
(D)
neutrons
15
The S.I unit of moment of a force is
Trả lời
(B)
Nm
16
Calculate the height of the image formed by a pinhole camera of length 12cm used to photograph an object 60cm away from the hole and 70cm high
Trả lời
(D)
14 cm
17
When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that of Q. The mass of P is half that of Q. The ratio of the specific heat capacity pf P to Q is
Trả lời
(C)
1:1
18
When the r.m.s value of a source of electricity supply is given as 240v, it means that the peak value of the supply is
Trả lời
(B)
340v
19
Which of the following operations can be used to convert an alternative current dynamo into a direct current dynamo
Trả lời
(C)
slip rings are replaced with split ring commutator
20
The net capacitance in the circuit above is
Trả lời
(D)
2.0µF
21
The instrument used to measure the pressure of a gas is
Trả lời
(D)
manometer
22
A man of mass 50kg ascends a flight of stains 5m high in 5 seconds. If acceleration due to gravity is 10ms\(^{-2}\) the power expended is
Trả lời
(D)
500w
23
A radio station broadcast at a frequency of 600KHZ. If the speed of light in air is 3 × 108ms\(^{−1}\). Calculate the wavelength of the radio wave
Trả lời
(B)
5.0 × 10\(^2\)m
24
Which of the following is a scalar quantity?
Trả lời
(D)
Mass
25
Determine the focal length of a thin converging lens if the power is 5.0 dioptres
Trả lời
(B)
0.2 m
26
A string of length 5cm is extended by 0.04m when a load of 0.8kg is suspended at the end. How far will it extend if a force of 16N is applied? [g = 10ms\(^{-2}\)]
Trả lời
(D)
0.08m
27
How can energy loss be minimized through Eddy-current?
Trả lời
(A)
By using high resistance wire
28
From the diagram above, calculate the energy stored in the capacitor
Trả lời
(B)
4.0 x 10\(^{-4}\)J
29
A constant force of 5N acts for 5 seconds on a mass of 5kg initially at rest. Calculate the final momentum
Trả lời
(B)
25kgms−1
30
I. Refraction II. Interference III. Diffraction Which of the above properties are common to all waves?
Trả lời
(B)
I, II and III
31
Which of the following is correct about an electric cell?
Trả lời
(D)
Secondary cell has a very low internal resistance
32
Which of the following is a semiconductor
Trả lời
(B)
silicon
33
Which of the following surfaces will absorb radiant heat energy?
Trả lời
(C)
black
34
It is known that a neutron exists in a light atomic nucleus
Which of the following also exists in the nucleus?
Trả lời
(D)
proton
35
The instrument to measure the relative density of liquid is
Trả lời
(B)
hydrometer
36
What is the speed of a body vibrating at 50 cyclic per second
Trả lời
(A)
100 πrads\(_{−1}\)
37
The action of blotting paper on ink is due to
Trả lời
(C)
capillarity
38
When two mirrors are placed at an angle of 90º to each other, how many images will be formed when an object is placed in front of the mirrors
Trả lời
(C)
3
39
If silicon is doped with phosphorus, what type of semiconductor material will be formed?
Trả lời
(C)
n-type
40
Calculate the angle of minimum deviation of a 60º prism of a refractive index 1.5[ \(sin^{-1}\) (0.75) = 49º]
Trả lời
(A)
38o
41
What is the cost of running seven 40 W lamps and five 80 W lamps for 12 hours of the electrical energy cost N7.00kWh?
Trả lời
(D)
N57.12
42
From the diagram above, calculate the total current in the circuit
Trả lời
(B)
3.7A
43
Calculate the time taken for a mango fruit that fall from the tree 20 m to the ground [g = 10 ms-2]
Trả lời
(D)
2s
44
Which of the following is not a mechanical wave?
Trả lời
(B)
radio waves
45
The velocity ratio of an inclined plane where angle of inclination in θ is
