If the volume of a gas is recorded as 76cm3 at a temperature of 27°C with a pressure of 800mmHg. What will be the volume of the gas at S.T.P?
Trả lời
(C)
72.8cm3
2
Boyle’s law may be Written as
Trả lời
(A)
P1V1= P2V2
3
The direction of the path taken by light is called
Trả lời
(C)
Ray
4
What is the inductance (L) of an inductor whose reactance is 1Ω at 50/ π hertz (H)?
Trả lời
(B)
0.01H
5
A stroboscope can be used to make the wave appear …………..
Trả lời
(A)
Stationary
6
In an elastic collision
I. Energy is conserved
II. Energy is decreased
III. Energy is increased
IV. Linear momentum conserved
Trả lời
(B)
I and IV only
7
Body floats in fluid when its …………………
Trả lời
(B)
Displaces its own weight of the fluid
8
The general gas law can be written as
Trả lời
(A)
PV ÷ T = a constant
9
A motor boy of a driver saw what seems to appear to be a pool of water a head of him, while his driver drives a new truck on a sunny day. Which of the following explains his observation?
Trả lời
(D)
The sun ray from the sky were passing from a hot air (layer) to cold layer
10
Which of the following is not luminous object?
Trả lời
(B)
The moon
11
The resultant force of a couple is ………?
Trả lời
(B)
Zero
12
A vector quantity can only be completely described when ……… and …………are mentioned.
Trả lời
(B)
Magnitude and direction
13
In which of the following device is the expansion of solid not required?
I. Simple pendulum
II. Fire alarms
III. Thermostat
IV. Bimetallic thermometer
Trả lời
(C)
I only
14
If an object is placed at a height of tem above the ground at a stationary point. It posses what types of energy?
Trả lời
(C)
Potential energy
15
Calculate the gravitation force of attraction between two planets of \(10^{24}\)kg and \(10^{27}\)kg separated by a distance of \(10^{20}\)meters
Trả lời
(A)
6.67N
16
Mr. F. Abioye observed his image through a plane mirror, kept at a distance 4.7m away from him in his room. At what distance is the image found from Abioye's eye?
Trả lời
(A)
9.4m
17
Primary colours of light are
Trả lời
(A)
Red, blue and green
18
Electrons were discovered by
Trả lời
(B)
J.J Thompson
19
What is the relationship mechanical advantage (MA) velocity Ratio (V.R) and efficiency with percentage?
Trả lời
(A)
e = M.A/V.R × 100 %
20
The external parts of an object can be measure accurately through the use of which scientific instrument?
Trả lời
(B)
Vernier Caliper
21
Convert 45°C to kelvin
Trả lời
(A)
318K
22
A member of the crew of a SPACESHIP experiences weightlessness in a space when they
Trả lời
(A)
Fall freely from the earth’s gravitational field
23
Radio waves belong to the class of wave whose velocity is about
Trả lời
(C)
3 ×108m/s
24
The compressed regions and the space-out regions in longitude wave are refers to as
Trả lời
(A)
Compression and Rarefaction
25
At what respective value of a, b, and c would the unit of work, the joule, be dimensionally similar to Ma Lb Tc?
Trả lời
(B)
1, 2, – 2
26
The device in which one circuit controls another, especially if the current in the second circuit is large or dangerous is known as
Trả lời
(B)
Magnetic relay device
27
Heat transfer in the surrounding without a material medium is possible through?
Trả lời
(C)
Radiation
28
Quantities of heat Q can be measured using a container called
Trả lời
(C)
Calorimeter
29
Lodestone is a natural magnet, it points at
Trả lời
(B)
N–S when suspended freely
30
What type of electromagnetic radiation can be used to take photographs in the haze?
Trả lời
(B)
infrared rays
31
If a mango fruit dropped at a height of 50 meters. How long does it reach the ground? (take g = 10m/s2)
Trả lời
(D)
3.2sec
32
A zinc has a heat capacity of 40 J/K, what is the mass of the zinc, given that the specific heat of zinc is 380 J/kg k
Trả lời
(A)
0.11kg
33
If a ball released from a height of 20m, How long would it take the ball to reach the ground? (assures g = 10m/s)
Trả lời
(A)
2sec
34
If the velocity ratio of a machine is 5. What is its ratio of x and y?
Trả lời
(C)
5 : 1
35
If the mechanical advantage of a machine is 4. What is its ratio for LOAD to EFFORT?
Trả lời
(A)
4:01
36
For a best result using temperature to achieve an accurate measurement, it is best to use
Trả lời
(B)
gas thermometer
37
A structural engineer stood on a top of a building releasing a light and heavy object to the ground which of the following statement is true?(Neglect Air Resistance)
Trả lời
(A)
Both the light and heavy subject reach the ground at the same time
38
If an object whose mass is 3kg moves in a circular path of a radius 0.7m, records a speed at 2m/s. What is the result of the angular velocity?
Trả lời
(C)
3–1rads–1
39
The optical instrument which is suitable for viewing a nearby objects is ………..?
Trả lời
(C)
microscope
40
The symbol −10X used to represent which of the particles?
Trả lời
(C)
Electrons
41
A radioactive source emits X–rays of very short wavelength (10\(^{-13}\)m ). What is the frequency of these rays?
Trả lời
(C)
3 × 1021HZ
42
The strength of an electromagnet increases with
Trả lời
(A)
Increases in the number of turn of the coil
43
Which of the following will increase the boiling point of water?
I. Taking it to a high altitude
II. Dissolving a salt into it
III. Heating it in a sealed flask
IV. Increasing the rate of heat supply
.
Trả lời
(C)
II & III only
44
Transformers are designed so that energy losses are reduced to a minimum. This is achieved through which of these process?
I. Using a soft iron ore
II. Laminating the iron core to reduce energy loses due to eddy current
III. Designing an efficient iron core
Trả lời
(C)
I, II, & III only
45
The two liquids which are often used in thermometer on experiment basic is known as
Trả lời
(C)
Mercury and Alcohol
46
Neutron were discovered by
Trả lời
(B)
James Chadwick
47
If a projectile has maximum range of 36m, find the speed of projection (Take g = 9.8m/s2)
Trả lời
(A)
19m/s
48
What is the S.I unit of relative density?
Trả lời
(D)
has no S.I unit
49
For a best result using temperature to achieve an accurate measurement, it is best to use
Trả lời
(B)
gas thermometer
50
The dimension of universal gravitational constant is……….?
Trả lời
(A)
\( M^{–1}L^3 T^{–2} \)
51
A good electric cell should have the following except
Trả lời
(D)
Cost and dangerous of the cell
52
The r.m.s value of a supply voltage is quoted at 200v. What is the approximate peak value of the voltage?
Trả lời
(C)
283volts
53
Heat transfer by convection will take place in one the following substance.
Trả lời
(D)
Water
54
A regular spacing or arrangement of atoms in a crystalline material is called
Trả lời
(B)
Lattice
55
The net movement of solvent molecules from a region of high solvent potential to a region of lower solvent potential through a partially or semi permeable membrane is refer to as
Trả lời
(B)
Osmosis
56
The eyeball consists of a round tough white skin called
Trả lời
(A)
Sclerotic
57
Which one of the following is a vector quantity?
Trả lời
(A)
Temperature gradient
58
Efficiency of a transformer is equal to
Trả lời
(D)
Efficiency of a transformer = (power developed in the secondary coil ÷ power supplied to the primary coil) × 100%
59
Volatile liquids usually
Trả lời
(B)
have low boiling points
60
When a man moves toward a plane mirror at a speed of 6m/s, the distance the man and his image increased at a speed of?
Trả lời
(C)
12 m/s
61
Which of the following instrument is most accurately for comparing electromotive force (e.m.f) of two cells?
Trả lời
(D)
Potentiometer
62
In an inelastic collision
I. Energy is conserved
II. Energy is decreased
III. Energy is increased
IV. Linear momentum conserved
Trả lời
(B)
II and IV only
63
The normal temperature of human body is record at what ranges?
Trả lời
(D)
Between 35°C to 37°C
64
The property of a body to remain at rest or to continue to move in a straight line is known as
