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Ibeere 2 Ìròyìn
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?
Awọn alaye Idahun
Ibeere 3 Ìròyìn
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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Ibeere 4 Ìròyìn
The statement that the mechanical advantage of a machine is 3 means that the
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Ibeere 5 Ìròyìn
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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Ibeere 6 Ìròyìn
The speed of sound travelling in various media increases in the order:
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Ibeere 8 Ìròyìn
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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Ibeere 11 Ìròyìn
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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Ibeere 12 Ìròyìn
An object is placed 15cm in front of a concave mirror of focal length 20cm. The image formed is
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Ibeere 13 Ìròyìn
The inside of a vacuum flask is usually coated with silver to reduce heat loss by
Ibeere 14 Ìròyìn
A lead-acid accumulator is used in preference to a dry battery in a car because
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Ibeere 15 Ìròyìn
The falling of light energy on a metal such that electrons are liberated from the metal is called
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Ibeere 16 Ìròyìn
Notes of the same frequency sounded on a piano and on a flute may differ in
I. pitch
II. quality
III. Loudness
Ibeere 18 Ìròyìn
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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Ibeere 19 Ìròyìn
Which statement is TRUE of a block of stone of mass m, with zero momentum?
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Ibeere 20 Ìròyìn
Which statement is a correct consequence of the uncertainly principle?
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Ibeere 21 Ìròyìn
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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Ibeere 24 Ìròyìn
The invisible part of the spectrum of white light consists of
Ibeere 25 Ìròyìn
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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Ibeere 26 Ìròyìn
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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Ibeere 28 Ìròyìn
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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Ibeere 29 Ìròyìn
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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Ibeere 30 Ìròyìn
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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Ibeere 32 Ìròyìn
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?
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Ibeere 34 Ìròyìn
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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Ibeere 35 Ìròyìn
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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Ibeere 36 Ìròyìn
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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Ibeere 39 Ìròyìn
What part of a camera functions in a similar way to the retina of the eye?
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Ibeere 40 Ìròyìn
What is the energy stored in a 10μ F capacitor if the potential difference between the plates is 40 V?
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Ibeere 41 Ìròyìn
The magnetic effect of a current-carrying coil is NOT utilized in the making of a/an
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Ibeere 42 Ìròyìn
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)
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Ibeere 44 Ìròyìn
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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