physics

An object is placed 10m from a pinhole camera of length 25cm. Calculate the linear magnification.

A. 2.5x10² B. 2.5x10−² C. 2.5x10−¹ D. 2.5x10¹ Correct Answer: Option B - 2.5x10−² Explanation Linear Magnification=Length of Camera/Distance of…

5 years ago

A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill?

A. 528m B. 66m C. 136m D. 264m Correct Answer: Option C - 136m Explanation Time for echo both ways…

5 years ago

The distance between two successive crests of a wave is 15cm and the velocity 300m/s¹. Calculate the frequency.

A. 2.0x10²Hz B. 4.5x10³Hz C. 2.0x10³Hz D. 4.5x10²Hz Correct Answer: Option C - 2.0x10³Hz Explanation Wavelength = 15cm = 0.15m…

5 years ago

Heat transfer by convection in a liquid is due to the ______?

A. Latent heat of vaporization of the liquid B. Increased vibration of the molecules of the liquid about theit mean…

5 years ago

The temperature at which the water vapour present in the air is just sufficient to saturate air is?

A. Boiling point B. Ice point C. Saturation point D. Dew point Correct Answer: Option D - Dew point

5 years ago

The melting point of a substance is equivalent to its?

A. Vapour Pressure B. Solidification Temperature C. Liquidification Temperature D. Solidification Pressures Correct Answer: Option B - Solidification Temperature

5 years ago

The quantity of heat needed to raise the temperature of a body by 1K is the body’s?

A. Heat capacity B. Internal energy C. Specific heat capacity D. Latent heat of fusion Correct Answer: Option A -…

5 years ago

What is the equivalent of 20K in Celsius scale?

A. -253°C B. -293°C C. 68°C D. 36°C Correct Answer: Option A = -253°C Explanation = (20 - 273)°C =…

5 years ago

The small droplets of water that form on the grass in the early hours of the morning is?

A. Fog B. Haul C. Mist D. Dew Correct Answer: Option D - Dew

5 years ago

A force of 500N is applied to a steel wire of cross-sectional area 0.2m². The tensile stress is?

A. 2.5x10^4Nm−² B. 1.0x10²Nm−² C. 1.0x10³Nm−² D. 2.5x10³Nm−² Correct Answer: Option D - 2.5x10³Nm−² Explanation Stress=Force/Area Stress=500/0.2 = 2500 =…

5 years ago