physics

A simple microscope forms an image 10cm from an eye close to the lens. If the object is 6cm from the eye, calculate the focal length of the lens

A. 3.75cm B. 4.00cm C. 15.00cm D. 16.00cm Correct Answer: Option A A. 3.75cm

6 years ago

A concave mirror can be used to produce a parallel beam of light if a lighted bulb is placed?

A. between its focus and the pole B. at its focus C. at its centre of curvature D. between its…

6 years ago

A periodic pulse travels a distance of 20.0m in 1.00s. If its frequency is 2.0 x 10³Hz. Calculate the wavelength.

A. 1.0 x 10‾³m B. 1.0 x 10‾²m C. 2.0 x 10‾²m D. 1.0 x 10²m Correct Answer: Option B…

6 years ago

The temperature at which the saturated vapour pressure of a liquid is equal to the external atmospheric pressure is known as its?

A. dew point B. boiling point C. lower fixed point D. Tripple point Correct Answer: Option B B. boiling point

6 years ago

The mass of water vapour in a given volume of air is 0.05g at 20°C, while the mass of water vapour required to saturate it at the same temperature is 0.15g. Calculate the relative humidity of the air.

A. 3.33% B. 5.55% C. 33.33% D. 55.55% Correct Answer: Option C C. 33.33%

6 years ago

A piece of metal of mass 50g is cooled from 80°C to 20°C. Calculate the amount of heat lost. (specific heat capacity of the material of metal = 450Jkg‾¹K‾¹)

A. 4.50 x 10³J B. 2.25 x 10³J C. 1.80 x 10³J D. 1.35 x 10³J Correct Answer: Option D…

6 years ago

The volume and pressure of a given mass of gas at 27°C are 76cm³ and 80cm³ of mercury respectively. Calculate the volume at s.t.p

A. 36.2cm³ B. 72.8cm³ C. 100.0cm³ D. 808.9cm³ Correct Answer: Option B B. 72.8cm³

6 years ago

The diagram shows the variation of volume V of gas with temperature at the point X is

A. -32°C B. -100°C C. -273°C D. -373°C Correct Answer: Option C C. -273°C

6 years ago

Two bodies P and Q, are in thermal equilibrium, which of the following statements about the bodies is correct?

A. the temperature of Q is higher than that of P B. P and Q have the same heat capacity…

6 years ago

A machine of efficiency 8% is used to raise a body of mass 75kg through a vertical height of 3m in 30s. Calculate the power input. (g = 10ms‾²)

A. 9.4W B. 60.0W C. 75.0W D. 93.8W Correct Answer: Option D D. 93.8W

6 years ago
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