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. 2.3×10¹J B. 2.3×10²J C. 2.3×10^4J D. 2.3×10^5J E. 3.3×10^7J Correct Answer: Option D – 2.3×10^5J Explanation ΔH=mL=0.1×2.3×10^6 =2.3×10^5JWhenever 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
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 ⇒v=5u=20, let u be x; v= 5x if v= 20 then 5x = 20 therefore x =20/5 = 4u = 4cm
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 – RefractionProducts
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