In the Rutherford scattering experiment, a beam of alpha particles was fired at a thin gold film and few of the particles were deflected considerably. This shows that the nucleus of an atom
- A. is positively charged and is concentrated in a tiny volume
- B. contains protons and electrons distributed in a tiny volume.
- C. is concentrated in a tiny volume and contains alpha particles.
- D. is distributed in a tiny volume and emits alpha particles.
A lead bullet of mass 0.05 kg is fired with a speed of 200 m/s into a lead block of mass 0.95 kg at rest. Given that the lead block moves after the impact, determine its kinetic energy.
- A. 150J
- B. 200J
- C. 50J
- D. 100J
A ball, P, is released from the roof of a building at the same time as another ball, Q, is thrown vertically upward from the base of the building. Which of the following statements is correct?
- A. The acceleration of P is greater than that of Q and both are in the same direction.
- B. The acceleration of P is less than that of Q and both are in the same direction.
- C. The acceleration of P is equal to that of Q and both are in the same direction.
- D. The acceleration of P is equal to that of Q and are in opposite directions.
The colours of the visible light region of the electromagnetic spectrum that have the shortest and longest wavelengths respectively are
- A. red and blue.
- B. indigo and violet
- C. violet and red.
- D. yellow and blue.
The property of a body that determines the direction of heat flow when the body is in contact with another body is the
- A. Heat capacity
- B. mass
- C. Power
- D. Temperature
The sagging of overhead electrical wires is caused by
- A. radiation of heat.
- B. rough handling.
- C. gravitational attraction
- D. Linear expansion
A direct current cannot pass through a parallel plate capacitor because
- A. the plates are non-conducting.
- B. the dielectric between the plates is non-conducting.
- C. there is a leakage of charge from the plates.
- D. the plates have equal but opposite charges.
The diagram above illustrates a hot metal suspended at the centre of a closed uniform box. Thermometers E, F, G and H are placed in contact with four sides of the box. Which of the thermometers would register the highest temperature?
- A. G
- B. F
- C. H
- D. E
A cell of emf 2 V has an internal resistance of 0.5 Ω. A current of 0.4 A passes through an external resistor, P. Determine the resistance of P.
- A. 4.5Ω
- B. 5Ω
- C. 1Ω
- D. 4Ω
When a light-weight body and a massive body are acted upon by the same force for the same period of time, the
- A. massive body has a higher momentum.
- B. massive body builds up a higher velocity.
- C. lighter body has a higher momentum.
- D. momenta of both bodies remain the same.
A car, P, with a velocity of 30 m/s is traveling in the same direction as a car, Q, with a velocity of 20 m/s. The velocity of P relative to Q is
- A. \(50ms^1\)
- B. \(45ms^1\)
- C. \(20ms^1\)
- D. \(10ms^1\)
The specific latent heat of vapourization of lead is 8.7 × \(10^5 Jkg_1\). This means that 8.7 × \(10^5\) J of thermal energy is required to change
- A. a given mass of molten lead to vapour at constant temperature and pressure.
- B. 1 kg of molten lead to vapour at constant temperature and pressure.
- C. 1 kg of solid lead to vapour at constant temperature and pressure.
- D. 1 kg of molten lead to vapour for every degree rise in temperature.
A liquid is left in an open dish. After several days, there is less liquid in the dish. Which of the following statements explains this observation? The
- A. most energetic molecules leave the surface and escape into the air.
- B. least energetic molecules leave the surface and escape into air.
- C. most energetic molecules leave the surface and return.
- D. least energetic molecules leave the surface and return.
An electron moves from an energy level of -8.6 eV to another level of -3.5 eV. Determine the frequency of the absorbed radiation. [1 eV = 1.6 × \(10^{19}\) J, h = 6.6 × \(10^{34}\) Js]
- A. \( 2.93 \times 10^{15}\)Hz
- B. \( 3.59 \times 10^{16}\)Hz
- C. \( 5.39 \times 10^{15}\)Hz
- D. \( 1.24 \times 10^{15}\)Hz
The range of wavelengths of the infrared waves in an electromagnetic spectrum is \(10^{-3}\) m to \(10^{-6}\)m. The wavelength of the radiation is
- A. longer than \(10^{-6} m\).
- B. shorter than \(10^{-6} m\).
- C. shorter than \(10^{3} m\).
- D. longer than \(10^{3} m\).
The ratio of maximum range to maximum height of a projectile is 4. Determine the angle of projection.
- A. \(30^0\)
- B. \(60^0\)
- C. \(45^0\)
- D. \(0^0\)
A charge of 10 C is transferred across a potential difference of 220 V. Determine the work done.
- A. 22J
- B. 2200J
- C. 210J
- D. 230J
A sound of frequency 512 Hz reaches a listener 100 m away. If the sound travels in air at s.t.p., what is its wavelength?
[speed of sound in air = 331 m/s]
- A. 1.550m
- B. 0,646m
- C. 5.120m
- D. 0.195m
The diagram above illustrates a velocity-time graph. Determine the distance between X and Y.
- A. 80.0m
- B. 160.0m
- C. 40.0m
- D. 10.0m
In an RLC series circuit at resonance, the voltages across the resistor and the inductor are 30 V and 40 V respectively. Determine the voltage across the capacitor.
- A. 50V
- B. 30V
- C. 70V
- D. 40V
The type of mirror used by dentists to inspect the teeth of patients is a
- A. Plane mirror
- B. cylindrical mirror
- C. concave mirror
- D. convex mirror