NECO SSCE - Physics - 2002

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?

Maelezo ya Majibu

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

Maelezo ya Majibu

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?

Maelezo ya Majibu

The energy stored in a capacitor of capacitance 5 μF is 40J. What is the voltage applied across its terminals?

Maelezo ya Majibu

What is stored by a dry Leclanhé cell?

Maelezo ya Majibu

A short response time is obtained in a liquid-in-glass thermometer when the

Maelezo ya Majibu

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?

Maelezo ya Majibu

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?

Maelezo ya Majibu

In which simple machine is the effort applied between the load and the fulcrum?

Maelezo ya Majibu

The wavelength of a stationary wave is 36.0cm. What is the distance between a node and the next anti-node?

Maelezo ya Majibu

In an operating X-ray tube, a high p.d is applied between the cathode and the anode for the purpose of

Maelezo ya Majibu

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?

Maelezo ya Majibu

The use of electrical fuses in domestic wiring is

Maelezo ya Majibu

Which device does NOT make use of the magnetic effects of an electric current?

Maelezo ya Majibu

An a.c. generator can be converted into a d.c. generator by replacing

Maelezo ya Majibu

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?

Maelezo ya Majibu

Which colour is deviated least when white light passes through a triangular prism?

Maelezo ya Majibu

If the temperature of a resistance wire is gradually increased, its resistance will

Maelezo ya Majibu

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.

Maelezo ya Majibu

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?

Maelezo ya Majibu

The ability of the eye to focus on objects at various distances is known as

Maelezo ya Majibu

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?

Maelezo ya Majibu

Which is a fundamental unit?

Maelezo ya Majibu

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)

Maelezo ya Majibu

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]

Maelezo ya Majibu

A body executing a simple harmonic motion has an angular velocity of 22 radians per second. If it has a maximum

Maelezo ya Majibu

What does NOT affect the rate of evaporation of a liquid

Maelezo ya Majibu

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?

Maelezo ya Majibu

According to the Kinetic Theory, what does NOT occur when the temperature of a constant volume of gas is increased?

Maelezo ya Majibu

If the size of the hole of a pinhole camera is increased, the image formed becomes

Maelezo ya Majibu

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?

Maelezo ya Majibu

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?

Maelezo ya Majibu

It is NOT possible to determine exactly and simultaneously the position and momentum of a particle. This statement is known as the

Maelezo ya Majibu

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)

Maelezo ya Majibu

The phenomenon of photoelectric effect is NOT used in

Maelezo ya Majibu

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

Maelezo ya Majibu

Which statement is NOT correct about Rutherford’s model of the atom?

Maelezo ya Majibu

Which radiation is emitted when a beam of fast moving cathode rays is stopped by a heavy element?

Maelezo ya Majibu

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?

Maelezo ya Majibu

Lenz’s law of electromagnetic induction states that

Maelezo ya Majibu

In which of the following are the substances arranged in descending order of their thermal conductivities?

Maelezo ya Majibu

Which of the following is a percussion instrument?

Maelezo ya Majibu

If the refractive index of water is 1.33, what is the critical angle for a water-air boundary?

Maelezo ya Majibu

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?

Maelezo ya Majibu

The silvered walls of a vacuum flask minimise loss of heat due to

Maelezo ya Majibu

What part of the camera corresponds to the iris of the eye?

Maelezo ya Majibu

Which process will increase the rate of oscillation of a pendulum?

Maelezo ya Majibu

In the normal use of a simple microscope, a person sees an

Maelezo ya Majibu