Two cars moving in the same direction have speeds of 100 kmh-1 and 130 kmh-1 what is the velocity of the faster car as measured by an observer in the slower car?
Хариулт
(A)
30 kmh-1
2
A stone and a feather are dropped from the same height above the earth surface. Ignoring air resistance, which of the following is correct?
Хариулт
(B)
the stone and the feather will both reach the ground at the same time
3
A car moves with an initial velocity of 25 ms-1 and reaches a velocity of 45 ms-1 in 10s. what is the acceleration of the car?
Хариулт
(A)
2 ms-2
4
The surfaces of conveyor belts are made rough so as to?
Хариулт
(B)
prevent the loads from slipping
5
A machine of velocity ratio 6 requires an effort of 400 N to raise a load of 800 N through I m. Find the efficiency of the machine
Хариулт
(C)
33.3%
6
If a wire 30 cm long is extended to 30.5 cm by a force of 300 N. find the strain energy of wire
Хариулт
(A)
0.75 J
7
In a hydraulic press, the pump piston exerts a pressure of 100 pa on the liquid. what force is exerted in the second piston of cross sectional area 3 m2?
Хариулт
(A)
300 N
8
The accurate measurement of the relative density of a substance in its powdered form is done with a beam balance and?
Хариулт
(A)
a density bottle
9
A hydrometer is an instrument used in measuring?
Хариулт
(D)
relative density of a liquid
10
One special advantage of alcohol over mercury as a thermometric liquid is its?
Хариулт
(B)
low freezing point
11
The density of a certain oil on frying becomes 0.4 kgm\(^{-3}\) with the volume of 20m\(^{3}\). what will be its initial volume when its initial density is 0.8 kgm\(^{-3}\) assuming no loss of oil due to spillage?
Хариулт
(B)
10m3
12
Heat is radiated by hot objects in the form?
Хариулт
(C)
infrared rays
13
If a container is filled with ice to the brim, what happens to the level of water when the ice completely melts?
Хариулт
(D)
the level of water drops
14
The small droplet of water that forms on the grass in the early hours of the morning is
Хариулт
(B)
dew
15
A vapor is said to be saturated when?
Хариулт
(A)
a dynamic equilibrium exists between liquid molecules and the vapour molecules
16
The pressure of one mole of an ideal gas of volume 10-2 m3 at a temperature of 27°c is
[molar gas constant = 8.3 J mol-1 k-1]
Хариулт
(C)
2.49 x 105 Nm-2
17
Which of the following has no effect on radiation?
Хариулт
(B)
density
18
The wavelength of a wave traveling with a velocity of 420 ms-1 is 42 m. what is its period?
Хариулт
(D)
0.1 s
19
The sound of an electricity bell dies down slowly when air is slowly pumped out from a bottle because
Хариулт
(C)
sound needs a material medium
20
During a thunderstorm, the sound is heard over a long time. this phenomenon is referred to as?
Хариулт
(D)
reveraberation
21
In comparing the camera and the human eye, the film of the camera function as the?
Хариулт
(A)
retina
22
An object 4 cm high is placed 15 cm from a concave mirror of focal length 5 cm. The size of the image is?
Хариулт
(A)
2 cm
23
An object is embedded in a block of ice, 10 cm below the plane surface. if the refractive index of the ice is 1.50, the apparent depth below the surface is?
Хариулт
(B)
6.67 cm
24
Which of the following is used for the correction of short sightedness?
Хариулт
(B)
concave lens
25
Dispersion occurs when white light passes through a glass prism because of the?
Хариулт
(B)
different speeds of the colour in the glass
26
When a positively charged rod is brought nearer the cap of a positively charged electroscope, the leaves divergence will?
Хариулт
(C)
diverge
27
Power supply is transmitted at a very high voltage and low current in order to?
Хариулт
(D)
prevent overheating of the coil
28
A galvanometer with full-scale deflection of 10 mA is to be converted to a voltmeter with full-scale deflection of 5v. if a series resistance of 498Ω is used for the conversion, the resistance of the galvanometer is ?
Хариулт
(B)
2Ω
29
Two inductors of inductance 5 mll and 15 mll are connected in series and a current of 5A flows through them. the total energy stored in the inductor is?
Хариулт
(E)
no correct option
30
In alternating current circuit at resonance, the angle of lead or lag is?
Хариулт
(D)
0°
31
In a discharge tube, most of the gas is pumped out so that electricity is conducted at?
Хариулт
(D)
low pressure
32
The ground stated energy for the hydrogen atom is 5.44 x 10-19J . If an electron drops from zero energy to ground state, calculate the frequency of the emitted radiation?
[h = 6.6 x 10-34 Js]
Хариулт
(E)
No correct option
33
Transistors are used for the?
Хариулт
(C)
amplification of signals
34
Which of the following is a pure semiconductor?
Хариулт
(B)
silicon
35
The diagram above shows a velocity - time graph. The statement that is true about this motion is that the car?
Хариулт
(A)
has no acceleration between point F and G
36
The diagram above represents balls in an undulating surface. Which of the following option represents positions of stable equilibrium?
Хариулт
(C)
III, VI and IX
37
A bob of weight 0.1 N hangs from a massless string of length 50 cm. A variable horizontal force which increase from zero is applied to pull the bob until the string makes an angle of 60o with the vertical. The work done is?
Хариулт
(D)
0.025 J
38
Two metals P and Q of length l1 and l2 are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is 2:3 and the ratio of lengths is 3:4. What is the ratio of increase in length of P to Q?
Хариулт
(C)
1:2
39
THe velocity of sound in air at 16oC is 340ms-1. What will it be when the pressure is doubled and its temperature raised to 127ºC?
Хариулт
(A)
400 ms-1
40
Three capacitors of capacitance 2μF, 4μFand 8μF are connected in parallel and a P.D of 6V is maintained across each capacitor, the total energy stored is?
Хариулт
(C)
2.52 x 10-4J
41
A cell of e.m.f 12V and internal resistance 4Ω is connected to an external resistor of resistance 2Ω. Find the current flow.
Хариулт
(D)
2 A
42
The diagram above shows a balanced metre bridge, the value of x is
Хариулт
(C)
33.3 cm
43
Three 4Ω resistors connected in parallel have a potential difference of 16 V applied across them. What is the total current in the circuit?
Хариулт
(B)
12 A
44
In the diagram above, a 200 W bulb is lighted by a 240 V a.c mains supply. If 1kwh is sold at N40, the cost of keeping the bulb lighted for a day is?
Хариулт
(B)
N192.00
45
In the diagram above, if the south-poles of two magnets strokes steel bar, the polarities at T and V will respectively be
