Which of the following factors does not affect the speed of sound?
- A. Loudness.
- B. Wind direction
- C. Temperature
- D. Material density
In storing magnets, the keeper is used to
- A. cancel the effect of the earth's magnetism
- B. reduce self demagnetization
- C. protect the magnet from stray electric field
- D. increase the strength of the magnet.
A galvanometer of full-scale deflection 10 mA has a resistance of 5\(\Omega\). Calculate the shunt needed to convert it to measure currents of 2 A.
- A. 0.025\(\Omega\)
- B. 0.050\(\Omega\)
- C. 0.250\(\Omega\)
- D. 0.500\(\Omega\)
A non-conducting vessel contains a liquid of mass 70 g at 25º C. Another 70.0g of the same liquid at 35ºC is quickly poured into the vessel. Determine the final temperature of the mixture
- A. 15ºC
- B. 20ºC
- C. 30ºC
- D. 40ºC
The maximum displacement of particles from equilibrium position in a wave motion is known as
- A. wave length.
- B. amplitude.
- C. frequency.
- D. polarization.
Four pieces of constantan wire, marked E, F, G, and H, each of length 1.0m, are at the temperature. Their respective diameters are 1 mm, 2 mm, 6 mm, and 10 mm. Which wire has the highest resistance?
- A. E
- B. F
- C. G
- D. H
The correct sequence of ionization power of alpha particle, gamma ray, and beta particle respectively is
- A. low, medium, high.
- B. high, medium, low.
- C. medium, low, high.
- D. high, low, medium.
Which of the following modes is the most economical method of transmitting electrical power over a long distance?
- A. Alternating current at high voltage and low current.
- B. Alternating current at low voltage and high current.
- C. Direct current at high voltage and low current.
- D. Direct current at low voltage and high current.
The phenomenon used for explaining the formation of a rainbow in the sky is
- A. interference.
- B. refraction.
- C. reflection.
- D. dispersion.
The main difference between X-rays and gamma rays is in their
- A. ionizing ability.
- B. absorbing rate.
- C. mode of propagation.
- D. mode of production.
Atmospheric pressure decreases with an increase in altitude because:
- A. Acceleration due to gravity increases with altitude.
- B. Temperature increases with altitude.
- C. Internal energy increases with altitude.
- D. Interaction among air molecules decreases due to less quantity of air.
Which of the following statements about a projectile is not correct?
- A. Projectile motion is a two-dimensional motion.
- B. A projectile is an object launched into the air and allowed to move freely due to gravity.
- C. The range of a projectile is independent of the acceleration due to gravity.
- D. The time of flight dependent of the acceleration due to gravity
The inside portion of a hollow metal sphere of diameter 20 cm is polished. The portion will therefore form a
- A. Concave mirror of focal length 5cm.
- B. Concave mirror of focal length 10 cm.
- C. Convex mirror of focal length 10 cm
- D. Convex mirror of focal length 5cm
In which of the following devices is the thermal expansion considered a disadvantage?
- A. Fire alarm
- B. Thermostat
- C. Bimetallic thermometer
- D. Balance wheel of a watch
A capacitor described as a mica capacitor has
- A. both plates are made of mica.
- B. a mica dielectric.
- C. a dielectric made of mica
- D. the same capacitance as that of mica
Which of the following terms has different dimension from the others?
- A. Stress x Strain
- B. Pressure
- C. \(\frac{\text{stress}}{\text{strain}}\)
- D. Torque
The depolarizing agent in a Leclanché cell is
- A. powdered carbon.
- B. manganese (IV) oxide.
- C. carbon rod.
- D. ammonium.
A boy of mass 40 kg jumps off a stationary skateboard and moves horizontally with a speed of 1.5 m/s while the skateboard moves in the opposite direction with a speed of 2.5 m/s. Calculate the mass of the skateboard.
- A. 60 kg
- B. 40 kg
- C. 3 kg
- D. 2 kg
The diagram above illustrates two boxes P and Q of masses 27.3 kg and 6.2 kg respectively on a smooth horizontal surface. If a force F of 150 N is applied to the combined forces, calculate the acceleration.
- A. 4.5 ms\(^{-2}\)
- B. 33.5 ms\(^{-2}\)
- C. 70 ms\(^{-2}\)
- D. 150 ms\(^{-2}\)
An object 2.0 cm high is placed at the radius of curvature of a concave mirror such that it is perpendicular to the principal axis of the mirror. Determine the height of the image.
- A. 0.5 cm
- B. 1.0 cm
- C. 1.5 cm
- D. 2.0 cm
Light of energy 1.12 x 10\(^{-18}\) J is incident on a metal of ejected electrons with maximum energy of 8.0 x 10\(^{-19}\)J. Calculate the threshold frequency of the metal. [h = 6.626 x 10\(^{-34}\)Js]
- A. 4.8 x 10\(^{14}\)Hz
- B. 1.2 x 10\(^{15}\)Hz
- C. 1.7 x 10\(^{15}\)Hz
- D. 2.8 x 10\(^{15}\)Hz