The rising of a liquid in an open and ended glass tube of narrow bore is
Answer
(C)
capillarity
2
Which of the following units is equivalent to the watt?
Answer
(B)
kgm2s-3
3
Which of the following statements about pressure in a liquid is correct?
Answer
(A)
the pressure in a liquid increases with depth
4
Solid friction, like viscosity is
Answer
(D)
in opposition to motion
5
The slope of a linear distance-times graph represents
Answer
(C)
speed
6
A body of mass 2kg is released from rest on a plane inclined at an angle of 60° to the horizontal. Calculate the acceleration of the body down the plane.[g = 10ms\(^{-2}\)]
Answer
(D)
8.7ms-2
7
The total area under a force-velocity graph represents
Answer
(C)
power
8
A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms\(^{-2}\)]. Calculate the speed of projection
Answer
(C)
12.0ms-1
9
A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms-2]. Determine the potential energy of the body at the maximum height of its motion
Answer
(A)
0.36J
10
The maximum displacement on either side of the equilibrium position of an object in simple harmonic motion represents
Answer
(B)
amplitude
11
From Newton's first law of motion,
Answer
(C)
the net force acting in uniform linear motion is zero
12
A body of mass 11kg is suspended from a ceiling fan by an aluminum wire of length 2m and diameter 2mm. Calculate the elastic energy stored in the wire [Young's modulus of aluminum is 7.0 x \(10^10Nm^{-2}\), g = 10m\(s^{-2}\), \(\pi\) = 3.142]`
Answer
(B)
5.5 x 10-2J
13
The velocity ratio of an inclined plane
Answer
(B)
increases with decrease in the angle of inclination
14
Which of the following types of thermometer is used for the calibration of other thermometers?
Answer
(B)
constant volume gas thermometer
15
The magnitude of the expansion or contraction of a substance depends on the i. temperature change ii. nature of the substance iii. size of the substance. Which of the statements above are correct?
Answer
(A)
i and ii only
16
Highly polished silvery surfaces are
Answer
(B)
poor absorbers and good emitters of radiation
17
The volume of a given mass of gas at 27oC and 800 mmHg is 76cm2. Calculate its volume at s.t.p
Answer
(B)
72.8 cm3
18
Ice of mass 10g at 5°C was completely converted to water at 0°C, calculate the quantity of heat used. [specific heat capacity of ice = 2.1 Jg\(^{-1}\)K\(^{-1}\), specific latent heat of fusion of ice = 336 Jg\(^{-1}\)]
Answer
(C)
3465J
19
An electric heater has a resistance of 50\(\Omega\). When it is immersed in water and connected to mains source, it draws a current of 4.0A. Calculate the heat gained by the water if the heater is switched on for 2 minutes, assuming no heat losses to the surroundings
Answer
(D)
96000J
20
When salt is dissolved in water, the freezing point of the water
Answer
(B)
decreases
21
The equation of a certain progressive transverse wave is y = 2 sin 2 \(\pi ( \frac{t}{0.01} - \frac{x}{30})\), where x and y are in cm and t in seconds. Calculate the period of the wave.
Answer
(B)
0.010s
22
At which position should an object be placed in front of a concave mirror in order to obtain an image which is of the same size as the object?
Answer
(A)
at the centre of curvature
23
Images formed by a convex mirror are always
Answer
(B)
behind the mirror
24
The refractive index of a material is 1.5. Calculate the critical angle at the glass-air interface
Answer
(D)
42o
25
A diverging lens of focal length 30cm produces an image 20cm from the lens. Determine the object distance
Answer
(B)
12cm
26
Which of the following statements about the Galilean telescope is not correct?
Answer
(A)
the final image is inverted
27
Which of the following radiations has it's frequency lower than that of infrared radiation?
Answer
(D)
radio waves
28
A string under tension produces a note of frequency 14Hz. Determine the frequency when the tension is quadrupled.
Answer
(C)
28Hz
29
Which of the following statements about waves in pipes is correct?
Answer
(C)
only odd harmonics are possible in closed pipes
30
When a person holds a negatively charges metal rod and stands bare-footed on the ground, how will the charges leak?
Answer
(A)
negative charges flows to the ground through the person's body
31
A charge of 2.0 x 10\(^{-5}\) C experiences a force of 80N in a uniform electric field. Calculate the magnitude of the electric field intensity
Answer
(B)
4.0 x 106 NC-1
32
A potential difference of 12V is applied across the ends of a 6\(\Omega\) resistor for 10 minutes. Determine the quantity of heat generated
Answer
(C)
14400J
33
Which of the following instruments is used to determine the accurate value of the electromotive force of a cell?
Answer
(D)
potentiometer
34
The capacitance of parallel plates capacitors varies
Answer
(C)
inversely as the distance between the plates
35
Which of the following devices does not makes use of eddy current for its action? A/An
Answer
(D)
induction coil.
36
A coil of inductance 0.12 H and resistance 4\(\Omega\), is connected across a 240V, 50Hz supply. Calculate the current through it. [\(\pi\) = 3.142]
Answer
(A)
6.3A
37
The work function of a metal is 2.56 x 10-19J. Calculate the frequency of a photon whose energy is required to eject from the metal an electron with kinetic energy of 3.0ev. [1 eV = 1.6 x 10-19J, h = 6.6 x 10-34Js]
Answer
(C)
1.12 x 1015Hz
38
The minimum energy required to cause photoelectric emission when the surface of a metal is irradiated with electromagnetic radiation of suitable frequency is called
Answer
(C)
work function
39
Which of the following particles are termed nucleons in a neutral atom?
Answer
(A)
protons and neutrons
40
Which of the following statements about the use of radioisotopes is not correct? They are used to
Answer
(A)
induce mutations in plants and animals to obtain new and improved varieties
41
Which of the following phenomena supports the theory that waves have a particle nature?
Answer
(B)
photoelectric effect
42
A block of wood of mass 5kg is pulled on a platform by a force of 40N as illustrated in the diagram above. If the frictional force, F experienced by the block is 12N, calculate the magnitude of the acceleration of the acceleration of the block
Answer
(B)
5.6ms-2
43
Four co-planar forces of magnitudes 10N, 17N, 6N and 20N act at point O as shown in the above diagram. Determine the magnitude of the resultant force
Answer
(D)
5.0N
44
The outlet of a bicycle pump is used to inflate a football as illustrated in the diagram above. Why does the pressure of the air inside the pump increases as the pump handle is slowly pushed downward at constant temperature?
Answer
(C)
frequency of collision of the air molecules with the walls of the pump is increased
45
The diagram above illustrates a waveform. Which of the point on the waveform are in phase?
