141.Water has an anomalous behavior between 0° and 4° C. Which of the following is correct?
- A. Mass of water increases between 0° C and 4° C
- B. Density of water decreases between 0° C and 4° C
- C. Volume of water increases between 0° C and 4°C
- D. Volume of water decreases between 0° C and 4° C
142.What is the Celsius equivalent of 50.0° F?
- A. 10° C
- B. 20° C
- C. 30° C
- D. 40° C
143.When water is heated in a glass vessel, the level first falls and then rises because
- A. The apparent expansion of the water is initially small and later increases
- B. There is anomalous expansion of water
- C. The glass vessel does not expand.
- D. Glass vessel expands first before water starts a more rapid expansion
144.Which of the following quantities of water has undergone the greatest change from its heat content at melting point?
- A. 0.5 kg of water at 3° C
- B. 0.2 kg of water at 8° C
- C. 0.005 kg of water at 80° C
- D. 0.1 kg of water at 12° C
145.Which would cause a more serious burn: 30 g of steam or 30 g of liquid water, both at 100 °C; and why is this so?
- A. Water, because it is denser than steam
- B. Steam, because of its specific heat capacity
- C. Steam, because of its latent heat of vaporization
- D. Water, because its specific heat is greater than that of steam
146.A certain radioactive element has a half life of 20 years. How long will it take the activity to become ¼ of its original?
- A. 20 years
- B. 40 years
- C. 60 years
- D. 80 years
147.A plane progressive wave is represented by y 2sin 100 t 0.2 x where all the symbols have their usual meanings. What is the velocity of the wave?
- A. 500 m s⁻¹
- B. 400 m s⁻¹
- C. 200 m s⁻¹
- D. 100 m s⁻¹
148.A point on a stationary wave where there is no movement of the medium is called
- A. Node
- B. Antinode
- C. Note
- D. Amplitude
149.A uniform wave has a speed of 10m/s and a period of 0.5 s. The distance between two nearest crests is
- A. 0.2 m
- B. 20 m
- C. 2 m
- D. 5 m
150.An organ pipe closed at one end is 80cm long. Determine the frequency of the fundamental note assuming that the speed of sound in air is 340m/s?
- A. 213Hz
- B. 318Hz
- C. 425Hz
- D. 425Hz
151.As transverse wave moves through a medium, the particles of the medium
- A. vibrate in a path parallel to the path of the wave
- B. do not move
- C. vibrate in a path perpendicular to the path of the wave
- D. vibrate at an angle of 60° to the path of the wave
152.The sound heard after the reflection of sound wave from a plane surface is known as
- A. Echo
- B. Refraction
- C. Vibration
- D. Revibration
153.Which of the following properties is not common to all waves?
- A. Reflection
- B. interference
- C. Diffraction
- D. Polarization
154.Which of the following statements is true about electromagnetic waves?
- A. They are longitudinal
- B. They can be seen
- C. They have the same frequency in vacuum
- D. They travel at the same speed in a vacuum
155.Which one of the following statements concerning electromagnetic waves is false?
- A. Electromagnetic waves are longitudinal waves
- B. Electromagnetic waves transfer energy through space
- C. The existence of electromagnetic waves was predicted by Maxwell
- D. Electromagnetic waves can propagate through a material substance
156.Which one of the following statements concerning waves is false?
- A. A wave can have both transverse and longitudinal components
- B. A wave carries energy from one place to another
- C. A wave does not result in the bulk flow of the material of its medium
- D. A transverse wave is one in which the disturbance is parallel to the direction of travel
157.A luminous object is placed at a given distance from a converging lens of focal length 12cm and a real image is produced. Find the image distance if it is equal to the object distance.
- A. 6cm
- B. 3cm
- C. 12cm
- D. 24cm
158.An object is placed 15 cm in front of a concave mirror of radius 40 cm. The image formed is
- A. virtual and 60 cm behind the mirror
- B. real and 60 cm in front of the mirror
- C. virtual and 40 cm from the mirror
- D. at infinity
159.How far from a concave mirror of radius 120 cm must an object be placed such that its erect image is four times its natural size?
- A. 72 cm
- B. 64 cm
- C. 45 cm
- D. 50 cm
160.How many images are formed when an object is placed in front of two plane mirrors that are inclined at angle 30° to each other?