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Pregunta 1 Informe
A sheet of white paper viewed through blue glass appears blue because
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Pregunta 2 Informe
The space surrounding a magnet in which the magnetic force is exerted is
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Pregunta 3 Informe
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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Pregunta 4 Informe
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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Pregunta 5 Informe
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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Pregunta 6 Informe
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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Pregunta 8 Informe
Evaporation of a liquid produces cooling of the liquid because the
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Pregunta 9 Informe
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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Pregunta 10 Informe
The mode of transference of heat which does not require any material medium is
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Pregunta 12 Informe
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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Pregunta 13 Informe
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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Pregunta 14 Informe
Which of the following properties is NOT exhibited by sound waves?
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Pregunta 15 Informe
For which of the following sets are the units fundamental?
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Pregunta 17 Informe
The area under the curve of a velocity time graph represents
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Pregunta 18 Informe
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
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Pregunta 20 Informe
\(^{226}_{88}Ra\) \(\to\) \(^{222}_{866}Rn\) + X + Energy. The equation above represents a nuclear decay of radium isotope. What is X?
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Pregunta 22 Informe
The inability of the eye to focus near objects is known as
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Pregunta 23 Informe
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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Pregunta 24 Informe
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
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Pregunta 25 Informe
Which of the following instruments can be used to measure e.m.f. most accurately.
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Pregunta 26 Informe
Which of the following statements about the concept of solid friction is NOT true?
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Pregunta 27 Informe
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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Pregunta 28 Informe
A short chain is usually attached to the rear side of petro tanker trailing behind it to ensure that the
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Pregunta 29 Informe
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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Pregunta 30 Informe
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.
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Pregunta 31 Informe
Which of the following scientists postulated that moving particles exhibit wave properties?
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Pregunta 32 Informe
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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Pregunta 34 Informe
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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Pregunta 35 Informe
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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Pregunta 36 Informe
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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Pregunta 37 Informe
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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Pregunta 38 Informe
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
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Pregunta 39 Informe
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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Pregunta 40 Informe
Calculate the critical angle for light travelling from water to air. (Refractive index of water = 1.33)
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Pregunta 41 Informe
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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Pregunta 42 Informe
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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Pregunta 43 Informe
Which of the following radiations have the longest wavelength?
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Pregunta 45 Informe
Young’s modulus of elasticity is the ratio of stress to strain, provided the load does not exceed the
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