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Pregunta 2 Informe
In which of the following are the substances arranged in descending order of their thermal conductivities?
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Pregunta 4 Informe
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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Pregunta 5 Informe
The ability of the eye to focus on objects at various distances is known as
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Pregunta 6 Informe
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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Pregunta 7 Informe
If the refractive index of water is 1.33, what is the critical angle for a water-air boundary?
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Pregunta 8 Informe
What does NOT affect the rate of evaporation of a liquid
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Pregunta 9 Informe
What part of the camera corresponds to the iris of the eye?
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Pregunta 10 Informe
Which colour is deviated least when white light passes through a triangular prism?
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Pregunta 11 Informe
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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Pregunta 12 Informe
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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Pregunta 13 Informe
The silvered walls of a vacuum flask minimise loss of heat due to
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Pregunta 14 Informe
In the normal use of a simple microscope, a person sees an
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Pregunta 15 Informe
If the temperature of a resistance wire is gradually increased, its resistance will
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Pregunta 16 Informe
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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Pregunta 17 Informe
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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Pregunta 18 Informe
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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Pregunta 19 Informe
Which process will increase the rate of oscillation of a pendulum?
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Pregunta 20 Informe
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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Pregunta 21 Informe
If the size of the hole of a pinhole camera is increased, the image formed becomes
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Pregunta 22 Informe
Which statement is NOT correct about Rutherford’s model of the atom?
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Pregunta 23 Informe
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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Pregunta 24 Informe
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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Pregunta 25 Informe
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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Pregunta 26 Informe
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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Pregunta 27 Informe
Which device does NOT make use of the magnetic effects of an electric current?
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Pregunta 28 Informe
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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Pregunta 30 Informe
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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Pregunta 31 Informe
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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Pregunta 33 Informe
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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Pregunta 34 Informe
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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Pregunta 35 Informe
The energy stored in a capacitor of capacitance 5 μF is 40J. What is the voltage applied across its terminals?
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Pregunta 36 Informe
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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Pregunta 37 Informe
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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Pregunta 38 Informe
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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Pregunta 39 Informe
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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Pregunta 40 Informe
Which radiation is emitted when a beam of fast moving cathode rays is stopped by a heavy element?
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Pregunta 41 Informe
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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Pregunta 43 Informe
An a.c. generator can be converted into a d.c. generator by replacing
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Pregunta 44 Informe
A short response time is obtained in a liquid-in-glass thermometer when the
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Pregunta 45 Informe
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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Pregunta 47 Informe
According to the Kinetic Theory, what does NOT occur when the temperature of a constant volume of gas is increased?
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Pregunta 48 Informe
In which simple machine is the effort applied between the load and the fulcrum?
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