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Question 1 Report
The inside of a vacuum flask is usually coated with silver to reduce heat loss by
Question 2 Report
N.N.P.C. gas cylinder containing 15kg of cooking gas was left open, and the gas emptied in 3.8 minutes, at an average speed of 20 ms-1. What force was exerted on the gas in the cylinder?
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Question 3 Report
The statement that the mechanical advantage of a machine is 3 means that the
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Question 4 Report
What part of a camera functions in a similar way to the retina of the eye?
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Question 5 Report
The wavelength of a stationary wave is 24.0cm. What is the distance between a node and the next antinodes?
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Question 6 Report
A cell can supply currents of 0.60 A and 0.30 A through a 2.0 ω and a 5.0 ω resistor respectively. What is the internal resistance of the cell?
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Question 7 Report
An electron of charge a = 1.6 × 10-19C is situated in a uniform electric field of intensity 2.4 × 105 V m-1. What is the force on the electron?
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Question 8 Report
When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eye piece is 5.0cm. What is the distance between the lenses?
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Question 9 Report
The falling of light energy on a metal such that electrons are liberated from the metal is called
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Question 10 Report
Totally reflecting prisms are preferred to mirrors in periscopes because
I. mirror givegive multiple images
II. silvering on mirrors is easy damaged
III. mirrors reflect less light than totally reflecting prisms
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Question 11 Report
A metal has a work function of 3.0 eV. What is the threshold frequency of the metal when electrons are just liberated from the metal.(1 eV = 1.6 × 10-19J; h = 6.6 × 10-34Js)
Question 12 Report
Which statement is TRUE of a block of stone of mass m, with zero momentum?
Question 14 Report
What is the angular velocity of an object in a horizontal circular path of radius 1.5m with a constant speed of 12ms-1?
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Question 15 Report
What is the energy stored in a 10μ F capacitor if the potential difference between the plates is 40 V?
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Question 16 Report
Notes of the same frequency sounded on a piano and on a flute may differ in
I. pitch
II. quality
III. Loudness
Question 18 Report
A waterfall is 630m high. What is the change in temperature of a quantity of water that falls from the top to the bottom of the waterfall? (Neglect heat losses to the surroundings, take g as 10 ms-2 and specific heat capacity of weather as 4200,J kg-1K-1
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Question 19 Report
An object placed 15cm from a converging lens forms a real image whose magnification is 2.0. What is the focal length of the lens?
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Question 20 Report
A body whose initial velocity is u is uniformly accelerated to a final velocity v in t seconds. If the distance travelled is s, and the acceleration is a, which equation is INCORRECT for the motion of the body?
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Question 21 Report
50cm3 of air at a pressure of 5Nm-2 is enclosed in a metal tube by a piston. If the piston is pushed in a distance of 10cm, what will the pressure of the air become, if the cross-sectional area of the tube is 2cm-2? (Assume that the temperature remains constant throughout)
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Question 22 Report
In 24 days a radioactive isotope decreases in mass from 128g to 2g. What is the half-life of the radioactive material?
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Question 23 Report
A transformer is connected to a 250 V a.c. supply. The primary coil has 5000 turns and the secondary voltage is found to be 10 V. What is the number of turns in the secondary coil?
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Question 24 Report
A 220 V, 60 Hz alternating current supply is connected to an inductor of 3.5H. What is the current passing through the inductor?
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Question 25 Report
If N.E.P.A. charges 65 kobo per kilowatt-hour for electricity supplied to consumers, what bill would an electric iron rated at 750 watts attract when used for 24 hours?
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Question 27 Report
Which statements(s) is/are NOT true?
I. A saturated vapour is one that is in equilibrium with its liquid in a closed space. II. A vapour contains molecules with varying kinetic energy and their distances apart are smaller than those of the molecules of a liquid
III. Relative Humidity = \(\frac{\text{Saturated vapour pressure at dew point}} {\text{Saturated vapour pressure at air temperature}}\) x 100%
IV. The saturated vapour pressure of water increases with temperature
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Question 28 Report
An astronaut is walking on the moon where the magnitude of the acceleration due to gravity "g’ is one-sixth that on earth. Compared with their magnitudes on the earth, his mass and weight on the moon are
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Question 29 Report
An object 3.00m high is placed at a distance of 7.50m from a pin-hole camera. If the image height is 6.00 cm, what is the distance of the film from the pin-hole?
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Question 30 Report
What is X in the equation given below? 42He + 94Be → 126C + X
Question 32 Report
A wave is represented by the equation y = 0.5 sin 0.4 Ω(X - 60t), where the distance (X) is measured in centimetres and time (t) in seconds. What is the wave length of the wave?
Question 33 Report
An object is placed 15cm in front of a concave mirror of focal length 20cm. The image formed is
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Question 34 Report
How much heat is required to convert 5.0g of ice at 0 ° C to water at the boiling point? (Specific latent heat of ice = 336Jg-1 specific heat capacity of water = 4.2Jg-1K-1)
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Question 35 Report
The speed of sound travelling in various media increases in the order:
Question 36 Report
Given the same amount of beat, a quantity of water will reach a higher temperature in a brass pot than in a clay pot of the same mass because
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Question 38 Report
The magnetic effect of a current-carrying coil is NOT utilized in the making of a/an
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Question 40 Report
Which statement is a correct consequence of the uncertainly principle?
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Question 41 Report
The invisible part of the spectrum of white light consists of
Question 44 Report
The lower and upper fixed points of a mercury-in-glass thermometer are marked X and 180 mm respectively. On a particular day the mercury meniscus in the thermometer rises to 60mm. If the corresponding reading on a Celsius scale is 20 ° C, what is the value X?
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Question 45 Report
What gives rise to the line spectra observed in atoms?
Question 46 Report
A lead-acid accumulator is used in preference to a dry battery in a car because
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