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Frage 1 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 2 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 3 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 4 Bericht
Which of the following scientists postulated that moving particles exhibit wave properties?
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Frage 5 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 6 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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Frage 7 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 8 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 9 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
J.J. Thomson’s model of the atom was abandoned because
Frage 13 Bericht
Which of the following radiations have the longest wavelength?
Frage 15 Bericht
The inability of the eye to focus near objects is known as
Frage 16 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 17 Bericht
\(^{226}_{88}Ra\) \(\to\) \(^{222}_{866}Rn\) + X + Energy. The equation above represents a nuclear decay of radium isotope. What is X?
Frage 18 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 19 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 20 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 21 Bericht
Which of the following statements about the concept of solid friction is NOT true?
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Frage 22 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 24 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 25 Bericht
A sheet of white paper viewed through blue glass appears blue because
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Frage 26 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 28 Bericht
The mode of transference of heat which does not require any material medium is
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Frage 30 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 31 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 32 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 34 Bericht
Which of the following instruments can be used to measure e.m.f. most accurately.
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Frage 35 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 37 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 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 41 Bericht
Calculate the critical angle for light travelling from water to air. (Refractive index of water = 1.33)
Frage 42 Bericht
The space surrounding a magnet in which the magnetic force is exerted is
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Frage 43 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 44 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 45 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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