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Pergunta 1 Relatório
In which of the following are the substances arranged in descending order of their thermal conductivities?
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Pergunta 2 Relatório
A brass cube of side 10cm is heated through 30°C. If the linear expansivity of brass is 2.0 × I0\(^{-5}\) K-1 , what is the increase in its volume?
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Pergunta 4 Relatório
An electric heater takes 4A when operated on a 250V supply. What is the cost of the electricity consumed at 10k per kWh when the heater is used for 5 hours?
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Pergunta 6 Relatório
In the normal use of a simple microscope, a person sees an
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Pergunta 7 Relatório
Which colour is deviated least when white light passes through a triangular prism?
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Pergunta 8 Relatório
An air bubble of volume 4cm3 is formed 20m under water. What will be its volume when it rises to just below the surface of the water if the atmospheric pressure is equivalent to a height of 10cm of water?
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Pergunta 9 Relatório
A transformer supplies 12V when connected to a 240V mains. If the transformer takes 0.120A from the mains when used to light a 12V, 24W lamp, what is its efficiency?
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Pergunta 10 Relatório
When a current of 1 .0A flows in an electrolyte for 3.0h, a mass of 1 .0g is deposited. What mass will be deposited in 10.0h if a current of 3.0A flows through the electrolyte?
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Pergunta 11 Relatório
Which process will increase the rate of oscillation of a pendulum?
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Pergunta 12 Relatório
A body of weight 20N displaces 12N of the liquid in which it is immersed. What is the upthrust of the liquid on the body?
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Pergunta 13 Relatório
In an operating X-ray tube, a high p.d is applied between the cathode and the anode for the purpose of
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Pergunta 14 Relatório
If the temperature of a resistance wire is gradually increased, its resistance will
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Pergunta 15 Relatório
What part of the camera corresponds to the iris of the eye?
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Pergunta 16 Relatório
The silvered walls of a vacuum flask minimise loss of heat due to
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Pergunta 17 Relatório
An object weighing 0.60N is hung on a spiral spring and caused it to extend by 6.0cm. The object is removed and a black of wood replacing it causes the spring to extend by 10.0cm. What is the weight of the block of wood?
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Pergunta 18 Relatório
A short response time is obtained in a liquid-in-glass thermometer when the
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Pergunta 19 Relatório
A body is uniformly accelerated from rest. Which of the following quantities vary/varies linearly with the square of the time?
I. Displacement
II. Velocity
III. Momentum
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Pergunta 20 Relatório
It is NOT possible to determine exactly and simultaneously the position and momentum of a particle. This statement is known as the
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Pergunta 21 Relatório
The wavelength of a stationary wave is 36.0cm. What is the distance between a node and the next anti-node?
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Pergunta 22 Relatório
A converging lens of focal length 5cm forms a virtual image which is 20cm from the lens. How far from the lens is the object?
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Pergunta 23 Relatório
What is the escape velocity of a satellite launched from the earth’s surface? (Take g as 10ms-2 and the radius of the earth as 6.4 × 106m)
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Pergunta 24 Relatório
A platinum-resistance thermometer has a resistance of 10 ω at 0°C and 18 ω at 100°C. Assuming that resistance changes uniformly with temperature, what is the resistance of the thermometer when the temperature is 45°C?
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Pergunta 25 Relatório
The energy stored in a capacitor of capacitance 5 μF is 40J. What is the voltage applied across its terminals?
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Pergunta 28 Relatório
If the refractive index of water is 1.33, what is the critical angle for a water-air boundary?
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Pergunta 29 Relatório
An object 8cm in front of a plane mirror moves at a speed of 6cm s-1 away from the mirror. What will be the distance separating the object and the image after 2s?
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Pergunta 30 Relatório
If the size of the hole of a pinhole camera is increased, the image formed becomes
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Pergunta 31 Relatório
A block of ice of mass 10kg at 0°C absorbs heat energy from its surroundings and changes to water at the same temperature. The heat absorbed is referred to as
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Pergunta 32 Relatório
A body executing a simple harmonic motion has an angular velocity of 22 radians per second. If it has a maximum
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Pergunta 33 Relatório
A negatively charged rod is brought near the cap of an electroscope. The cap is earthed momentarily while the charge is near to it. The rod is then removed. Which statement is correct?
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Pergunta 34 Relatório
Which device does NOT make use of the magnetic effects of an electric current?
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Pergunta 35 Relatório
A man stands in front f a high wall and produces a sound. If he receives the echo of the sound four seconds later, what is his distance from the wall? [The speed of sound in air is 330ms-1]
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Pergunta 36 Relatório
The ability of the eye to focus on objects at various distances is known as
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Pergunta 37 Relatório
An a.c. generator can be converted into a d.c. generator by replacing
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Pergunta 38 Relatório
Which of the following is/are TRUE of nuclear fission?
I. A heavy nucleus is split into two nuclei of comparable masses.
II. Two light nuclei are joined together to form a heavier nucleus.
III. The total mass of the products is less than that of the reactants.
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Pergunta 39 Relatório
An object is projected with a velocity of 50ms-1 from ground level at an angle θ to the vertical. If the total time of flight of the projectile is 5s, what is the value of θ? (g = 10ms-2)
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Pergunta 40 Relatório
Which statement is NOT correct about Rutherford’s model of the atom?
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Pergunta 41 Relatório
A body of mass 4 kg is accelerated from rest by a steady force of 9N. What is its speed when it has travelled a distance of 8m?
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Pergunta 42 Relatório
According to the Kinetic Theory, what does NOT occur when the temperature of a constant volume of gas is increased?
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Pergunta 43 Relatório
In which simple machine is the effort applied between the load and the fulcrum?
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Pergunta 46 Relatório
A body of mass M1 moving with a velocity U collides with a stationary body of mass M2 and both move with a common velocity V. If linear momentum is conserved, which expression correctly represents V?
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Pergunta 48 Relatório
Which radiation is emitted when a beam of fast moving cathode rays is stopped by a heavy element?
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