physics

Calculate the quantity of heat released when 100g of steam at 100°C condenses to water (Take the specific latent heat of vaporization of water as 2.3x 10^6Jkg−¹)

A. 2.3x10¹J B. 2.3x10²J C. 2.3x10^4J D. 2.3x10^5J E. 3.3x10^7J Correct Answer: Option D - 2.3x10^5J Explanation ΔH=mL=0.1×2.3×10^6 =2.3×10^5J

5 years ago

Whenever light waves are restricted to a specific plane they are said to be?

A. Diffracted B. Refracted C. Diffused D. Regularly reflected E. Plane polarized Correct Answer: Option E - Plane polarized

5 years ago

At what distance from a simple microscope must an object be placed so that the image 5 times the size of the object is produced 20cm from the lens?

A. 2cm B. 3.3cm C. 4cm D. 5cm E. 15cm Correct Answer: Option C - 4cm Explanation M=v/u = 5…

5 years ago

When white light is incident on a glass prism the spectrum produced on a screen placed beyond the prism is due to?

A. Diffraction B. Reflection C. Refraction D. Polarisation E. Interference Correct Answer: Option C - Refraction

5 years ago

Which of the following explains why a thick glass cup cracks when boiling water is poured into it?

A. Unequal expansion of the exterior and interior walls of the cup B. Anomalous expansion of the water C. Greater…

5 years ago

A solid plastic cube of side 0.2m is submerged in a liquid density of 0.8kgm−³. Calculate the upthrust of the liquid on the cube (g=10ms−²)

A. 0.064N B. 0.025N C. 0.016N D. 0.008N E. 0.003N Correct Answer: Option A - 0.064N Explanation Upthrust = Volume…

5 years ago

what would be the weight of the missile at that altitude?

A missile weighing 400N on the earth's surface is shot into the atmosphere to an altitude of 6.4 x 10^−6m.…

5 years ago

If they fall freely neglecting air resistance the?

Two blocks of the same dimension, one steel and the other wooden are dropped simultaneously from the same height. If…

5 years ago