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Question 1 Report
A body is launched from the earth’s surface, of radius R, so that it just escapes from the gravitational influence of the earth; If the gravitational constant is G and the mass of the earth is M, what is the escape velocity of the boby.
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Question 2 Report
A wire of length 100cm and cross-sectional area 2.0 × 10-3cm2 has a resistance of 0.10 ω. Calculate its electrical conductively.
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Question 3 Report
A short chain is usually attached to the rear side of petro tanker trailing behind it to ensure that the
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Question 4 Report
The mode of transference of heat which does not require any material medium is
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Question 6 Report
The distance between two successive crests of a water wave is 0.5m. If a particle on the surface of the water wave makes two complete vertical oscillations in 1s, calculate the speed of the wave.
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Question 7 Report
A transformer is required to give 120V from a 240V mains supply. If the primary has 5500 turns, how many turns has the secondary?
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Question 8 Report
Calculate the amount of heat generated in an external load of resistance 8Ω if an alternating current of peak value 5 A is passed through it for 100s.
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Question 9 Report
A narrow, uniform glass tube, closed at one end, constains air which is sealed by a thread of mercury. The tube is placed first horizontally and then vertically with the open end at the top. Which of the following statements is correct?
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Question 11 Report
Lines of force
I. Begin and end on equal and opposite electric charges.
II. are in state of tension which causes them to shorten
III. attract one another.
Which of the statement(s) is/are correct?
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Question 12 Report
Evaporation of a liquid produces cooling of the liquid because the
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Question 13 Report
How much heat is required to convert 50g of water at 100°C to steam at the same temperature? (Specific latent heat of vaporization of water = 2260 Jg-11)
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Question 15 Report
Which of the following scientists postulated that moving particles exhibit wave properties?
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Question 16 Report
Which of the following radiations have the longest wavelength?
Question 17 Report
Calculate the critical angle for light travelling from water to air. (Refractive index of water = 1.33)
Question 18 Report
The volume of a given mass of gas is 40cm3 at 27° C. What is its volume at 90° C if its pressure remains constant?
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Question 19 Report
\(^{226}_{88}Ra\) \(\to\) \(^{222}_{866}Rn\) + X + Energy. The equation above represents a nuclear decay of radium isotope. What is X?
Question 20 Report
An object is placed 30 cm in front of a concave mirror of focal length 20cm. Calculate the distance between the object and the image.
Question 21 Report
A constant force of 5N acts for 5s on a mass of 5kg initially at rest. Calculate the final momentum of the mass.
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Question 24 Report
Which of the following statements about the concept of solid friction is NOT true?
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Question 25 Report
A platinum-resistance thermometer has a resistance of 4Ω at 0°C and 12Ω at 100°C. Assuming that the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45°C.
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Question 27 Report
Which of the following instruments can be used to measure e.m.f. most accurately.
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Question 28 Report
A machine has an efficiency of 80%. If the machine is required to overcome a load of 60N with a force of 40N, calculate its velocity ratio.
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Question 29 Report
Two equal capacitances are connected first in series and then in parallel. The ratio of the effective series capacitance to the effective parallel capacitance is
Question 30 Report
A sheet of white paper viewed through blue glass appears blue because
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Question 31 Report
J.J. Thomson’s model of the atom was abandoned because
Question 32 Report
Which of the following statement(s) is/are correct?
I. When a liquid expands its density falls
II. When a mercury-in-glass thermometer is placed in a hot liquid, the mercury level first descends and then rises.
III. The apparent expansion of a liquid is greater than its real expansion.
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Question 33 Report
The inability of the eye to focus near objects is known as
Question 34 Report
Which of the following properties is NOT exhibited by sound waves?
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Question 35 Report
In 90 seconds, the mass of a radioactive element reduces to \(\frac{1}{16}\) of its original value. Determine the half- life of the element.
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Question 36 Report
Young’s modulus of elasticity is the ratio of stress to strain, provided the load does not exceed the
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Question 38 Report
The space surrounding a magnet in which the magnetic force is exerted is
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Question 39 Report
A stone is released from a height of 80m above the ground. Calculate its velocity just before it strikes the ground. (g=10ms-2)
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Question 40 Report
Which of the following motions will be produced by a pair of equal, opposite and non-collinear parallel forces acting on a body?
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Question 42 Report
A ball of mass m moving at velocity u collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.
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Question 43 Report
Which of the following statement(s) is/are correct about the isotopes of an elements? They have the same
I. chemical properties
II. nucleon number
III proton number
Question 44 Report
Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain
Question 45 Report
The resistance of a series R-C circuit is 5 ω If the impedance of the circuit is 13 ω calculate the reactance of the capacitor
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