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Ibeere 1 Ìròyìn
A man standing 510m away from a wall sounds a whistle. The echo from the wall reaches him 3s later. Calculate the velocity of sound in air.
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Ibeere 3 Ìròyìn
What is the coefficient of static friction between a load of mass 2kg and a horizontal surface, if the limiting frictional force is 10N? (g = 10 ms-2)
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Ibeere 4 Ìròyìn
An electric bell operated within an evacuated bell jar enables us to infer correctly that
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Ibeere 5 Ìròyìn
In a simple pendulum experiment, a boy observed that the times for 30 oscillations are 70.0s, 72.0s and 67.0s respectively. Calculate the mean period of oscillation of the pendulum.
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Ibeere 6 Ìròyìn
The clinical thermometer differs from other mercury-in-glass thermometers because it has
I. a constriction
II. a wide range
III. a short range
IV. a narrow bore.
Which of the above are correct?
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Ibeere 7 Ìròyìn
The length of a side of a metallic cube at 20° C is 5.0cm. Given that the linear expansively of the metal is 4.0 × 10-5K-1, find the volume of the cube at 120° C
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Ibeere 9 Ìròyìn
The smallest unit on the sleeve of a micrometer screw gauge is 0.5mm. There are fifty divisions on the thimble of the screw gauge.
What is the smallest length that can be measured with this instrument?
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Ibeere 10 Ìròyìn
An astronomical telescope which is being used to view a very distant object is said to be in normal adjustment if
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Ibeere 11 Ìròyìn
I. A scalar quantity has only magnitude
II. A scalar quantity has both magnitude and direction
III. A vector quantity has both magnitude and direction
IV. A vector quantity has only magnitude.
Which of the above statement is/are correct?
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Ibeere 12 Ìròyìn
Which of the following statements about evaporation and boiling is FALSE?
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Ibeere 13 Ìròyìn
400g of cold water is added to 200g of water at 70°C. If they are properly mixed and the temperature of the mixture is 300°C. calculate the initial temperature of the cold water. (Neglect the heat absorbed by the container)
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Ibeere 14 Ìròyìn
A man at the back of a crowd watches a parade by holding a plane mirror just above his head. The parade passes 6 metres behinde his head and the mirror is 0.25m in front of the man. How far does the image in the mirror appear to be from the man?
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Ibeere 15 Ìròyìn
Which of the following is used in a nuclear reactor to slow down fast moving neutrons?
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Ibeere 16 Ìròyìn
Which of the following is/are TRUE of nuclear fission?
I. A heavy nucleus is split into two nuclei of comparable masses
II. Two light nuclei are joined together to form a heavier nucleus
III. The total mass of the products is less than that of the reactants
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Ibeere 17 Ìròyìn
The image formed by a converging lens of focal length is of a distance of 2f from the lens. Calculate the lateral magnification produced
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Ibeere 18 Ìròyìn
If the first position of resonance in a resonance tube is 18.0cm from the open end, the distance from the open end to the next position of resonance will be
Ibeere 19 Ìròyìn
Two 2.0Ω resistors can be combined circuit to give an overall resistance of
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Ibeere 20 Ìròyìn
The specific heat of a substance in the solid state is C1; its specific beat in the liquid state is C2 and its latent heat of fusion is L. If a mass M of the substance is changed from the solid state at temperature T, to the liquid state, also at temperature T, the amount of heat required will be
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Ibeere 22 Ìròyìn
The half-life of a radioactive substance is 2 seconds. Calculate the decay constant.
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Ibeere 23 Ìròyìn
The image obtained on the screen of a pin-hole camera becomes less sharply defined when the
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Ibeere 24 Ìròyìn
An electric iron rated 250 V has a coil of resistance 125Ω. What is the cost of using it for I hour at 10k per kWh?
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Ibeere 25 Ìròyìn
A wave travels a distance of 20 cm in 3s. The distance between successive crests of the wave is 4cm. What is the frequency of the wave?
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Ibeere 26 Ìròyìn
A boy ran a distance of 200m in 24s. His average speed was 8.3ms-1. Which of the following is correct about the units in which the statements above are expressed?
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Ibeere 27 Ìròyìn
Two forces forming a couple are separated by a distance of 25cm. If one of the forces equals 40N, what is the moment of the couple?
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Ibeere 28 Ìròyìn
When a lever is in equilibrium, under the action of two or more forces, the algebraic sum of the moments of the forces about the point of support is
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Ibeere 30 Ìròyìn
To keep a lorry moving at a constant speed v, requires power p, from the engine. The force provided by the engine is
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Ibeere 31 Ìròyìn
A boy moving with a velocity of 3 ms-1 is brought to rest by a constant force after travelling 15m. Calculate the retardation.
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Ibeere 32 Ìròyìn
When a metal is heated to a high temperature, electrons are emitted from its surface. The process is known as
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Ibeere 33 Ìròyìn
If a positively charged glass-rod is used to charge an electroscope X by contact and an electroscope Y by induction, then
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Ibeere 34 Ìròyìn
A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field B in the direction of the field. The force on the particle is
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Ibeere 35 Ìròyìn
When electrical power is transmitted over long distances, the voltage is stepped up so that
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Ibeere 36 Ìròyìn
A piece of stone weights 180 N in air and 150 N in a beaker containing 160 N of methylated spirit. What is the up thrust exerted on the stone?
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Ibeere 39 Ìròyìn
A solid weights 5.0 N in air, 4.2 N in water and 4.4 N in liquid Y. Calculate the relative density of liquid Y.
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Ibeere 40 Ìròyìn
Which of the following is/areNOT affected by a magnetic field?
I. Alpha particle
II. Cathode rays
III. Neutrons
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Ibeere 41 Ìròyìn
The heat from a fire in a closed room reaches someone far away in the room, mainly by
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Ibeere 42 Ìròyìn
Which of the following pairs of light rays shows the widest separation in the spectrum of white light?
Ibeere 45 Ìròyìn
A gas occupies a certain volume at 27°C. At what temperature will its volume be twice times the original volume assuming that its pressure remains constant?
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Ibeere 46 Ìròyìn
An element of nuclear number A and proton number Z emits an alpha particle from its nucleus. The nucleon number and the proton number of the new element formed are respectively
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