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
Which of the following statements about a ferromagnetic material is correct? It
- A. has a high susceptibility.
- B. attracts non-magnetic materials.
- C. has low relative permeability.
- D. repels other magnetic materials.
The following statements are observations made about a towing vehicle and a bus that is being towed
I. The force exerted on the bus by the towing vehicle is of the same magnitude as the force that the bus exerts on the road.
II. The force exerted on the bus by the towing vehicle is of the same magnitude as the force exerted on the towing vehicle by the bus.
III. The towing vehicle exerts a force on the bus greater than the force exerted by the bus on the towing vehicle.
IV. The towing vehicle exerts a force on the bus that is the same as the force the road exerts on the towing vehicle.
Which of the following statements is/are correct?
- A. II, III and IV
- B. II only
- C. I, II and III only
- D. I only
A ball of mass 0.8 kg is dropped from a height, H. Just before hitting the ground, its velocity is 5.0 m/s. Determine H.
[g = 10 ms-2]
- A. 1.25m
- B. 4.00m
- C. 6.25m
- D. 1.60m
The instrument used to measure relative humidity is a
- A. Hygrometer
- B. Barometer
- C. Hydrometer
- D. Manometer
Which of the following devices is used to compare the relative magnitudes of charges on two given bodies?
- A. Ebonite rod
- B. Proof Plane
- C. Gold Leaf Electroscope
- D. Electrophorus
The following statements are advantages of a solid dielectric material between the plates of a capacitor except that
- A. the maximum potential difference the capacitor can withstand is increased.
- B. it increases the electrical conduction of the capacitor.
- C. the capacitance of the capacitor of given dimensions is much greater than that of the plates in a vacuum.
- D. it keeps the plates at a fixed separation.
A solenoid is constructed by winding an insulated copper on a long test tube. A constant direct current is passed through the solenoid. Which of the following actions will not increase the strength of the magnetic field of the solenoid? Inserting a
- A. steel rod in the test tube
- B. Nickel rod in the test tube
- C. Brass rod in the test tube
- D. Soft iron rod in the test tube
A 100 kg device is pulled up a plane inclined at 30° to the horizontal with a force of 1000 N. If the coefficient of friction between the device and the surface is 0.25, determine the total force opposing the motion.
[ g = 10 ms-2]
- A. 283.5N
- B. 975.0N
- C. 216.5N
- D. 716.5N
The most appropriate value of fuse for a kettle rated 220 V, 1.06 kW is
- A. 3A
- B. 6A
- C. 5A
- D. 4A
An atom in an excited state is one whose
- A. electrons are in the conduction band.
- B. potential energy is minimum.
- C. potential energy is maximum.
- D. electrons have moved to a higher energy level.
A planet has mass, M, and radius R, If the universal gravitational constant is G, what is the expression for the escape velocity of an object on the planet?
- A. \(\frac{\sqrt{GR}}{2}\)
- B. \(\frac{\sqrt{2GM}}{R}\)
- C. \(\frac{\sqrt{2G}}{R}\)
- D. \(\frac{\sqrt{GM}}{R}\)
Increasing the frequency of a sound wave produces a sound with
- A. higher pitch
- B. longer wavelength
- C. more overtones
- D. reduced loudness
In a mass spectrometer, an ion of charge, q, and mass, m, moving in a path of radius, r, in a field of flux density, B, has a speed of
- A. \(\frac{qBr}{m}\)
- B. \(\frac{mr}{qB}\)
- C. \(\frac{qm}{Br}\)
- D. \(\frac{mq}{r}\)
A body starts with an initial velocity of 20 m/s and moves with a uniform acceleration, a, for 15 seconds. Which of the following equations represents the distance, S, traveled?
- A. 300 + 56\(\frac{a}{2}\)
- B. 300 + \(\frac{225a}{2}\)
- C. 300 + \(\frac{225}{2a}\)
- D. 300a + \(\frac{225}{2}\)
In a controlled thermal fission reactor, the use of control rods will not affect the
- A. energy generated in the nuclear reactor
- B. rate of production of the neutrons.
- C. speed of the neutrons released on fission.
- D. amount of radiation produced in the nuclear reactor.
The process of producing electric current by a changing magnetic field is referred to as
- A. magnet induction
- B. electromagnetic induction
- C. flux linkage
- D. electrostatic induction.