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Frage 1 Bericht
Calculate the critical angle for light travelling from water to air. (Refractive index of water = 1.33)
Frage 3 Bericht
A sheet of white paper viewed through blue glass appears blue because
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Frage 4 Bericht
Young’s modulus of elasticity is the ratio of stress to strain, provided the load does not exceed the
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Frage 6 Bericht
Which of the following radiations have the longest wavelength?
Frage 7 Bericht
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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Frage 8 Bericht
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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Frage 10 Bericht
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
Frage 11 Bericht
\(^{226}_{88}Ra\) \(\to\) \(^{222}_{866}Rn\) + X + Energy. The equation above represents a nuclear decay of radium isotope. What is X?
Frage 12 Bericht
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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Frage 13 Bericht
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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Frage 14 Bericht
J.J. Thomson’s model of the atom was abandoned because
Frage 15 Bericht
A short chain is usually attached to the rear side of petro tanker trailing behind it to ensure that the
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Frage 16 Bericht
The inability of the eye to focus near objects is known as
Frage 18 Bericht
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.
Frage 19 Bericht
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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Frage 20 Bericht
Which of the following scientists postulated that moving particles exhibit wave properties?
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Frage 21 Bericht
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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Frage 22 Bericht
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
Frage 23 Bericht
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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Frage 24 Bericht
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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Frage 25 Bericht
Which of the following instruments can be used to measure e.m.f. most accurately.
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Frage 27 Bericht
The space surrounding a magnet in which the magnetic force is exerted is
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Frage 28 Bericht
The mode of transference of heat which does not require any material medium is
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Frage 29 Bericht
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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Frage 30 Bericht
Which of the following statements about the concept of solid friction is NOT true?
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Frage 31 Bericht
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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Frage 32 Bericht
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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Frage 34 Bericht
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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Frage 35 Bericht
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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Frage 38 Bericht
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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Frage 39 Bericht
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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Frage 40 Bericht
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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Frage 41 Bericht
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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Frage 44 Bericht
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
Frage 45 Bericht
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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