physics

Surface waves travelling in deep water at 15ms‾¹ are incident at a shallow water boundary. If the angles of incidence and refraction are 45° and 30° respectively. Calculate the speed of the waves in shallow water

A. 8.1ms‾¹ B. 10.0ms‾¹ C. 10.6ms‾¹ D. 22.5ms‾¹ Correct Answer: Option C C. 10.6ms‾¹

6 years ago

Humidity is used to describe the amount of?

A. air in water vapour B. cloud available in the atmosphere C. air in equal volume of cloud D. water…

6 years ago

Which of the following physical qualities affects the saturated vapour pressure of a liquid?

A. temperature B. volume C. mass D. density Correct Answer: Option A A. temperature

6 years ago

The amount of heat given out or absorbed when a substance changes its state at a constant temperature is known as?

A. latent heat B. heat capacity C. specific latent heat D. specific heat capacity Correct Answer: Option A A. latent…

6 years ago

The volume of an ideal gas at a pressure of 77cmHg and temperature 60°C is 24cm³. If the temperature and pressure are increased to 98°C and 81cmHg respectively, calculate the new volume of the gas

A. 411.5cm³ B. 267.1cm³ C. 254.2cm³ D. 112.7cm³ Correct Answer: Option C C. 254.2cm³

6 years ago

A given mass of an ideal gas has a pressure of 500Nm‾² at -13ºC. If its volume remains constant. Calculate its pressure at 247°C.

A. 25Nm‾² B. 50Nm‾² C. 500Nm‾² D. 1000Nm‾² Correct Answer: Option D D. 1000Nm‾²

6 years ago

A resistance thermometer has a resistance of 20Ω at 0°C and 85Ω at 100°C. If its resistance is 52Ω in a medium, calculate the corresponding temperature

A. 49.2°C B. 60.6°C C. 80.0°C D. 84.7°C Correct Answer: Option A A. 49.2°C Explanation 85Ω ........100°C 52Ω ........θ°C 20Ω…

6 years ago

A beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal. [neglect the weight of the beam]

A. 32.0N B. 26.7N C. 16.0N D. 13.3N Correct Answer: Option D D. 13.3N Explanation E x 3 = 80…

6 years ago

A screw jack with a Tommy bar of length 12cm is used to raise a car through a vertical height of 25cm by turning the Tommy bar through 50 revolutions. Calculate the approximate velocity ratio of the jack [π=3.142]

A. 21 B. 38 C. 48 D. 151 Correct Answer: Option D D. 151 Explanation P = 25/50=0.5 V.R =…

6 years ago

A simple machine with an efficiency of 75% lifts a load of 5000N when a force of 500N is applied to it. Calculate the velocity ratio of the machine

A. 10.0 B. 13.3 C. 17.5 D. 25.0 Correct Answer: Option B B. 13.3

6 years ago
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