A simple magnifying glass is used to view an object. At what distance from the lens must the object be placed so that an image 5 times the size of the object is produced 20cm from the lens?
A. 2cm B. 4cm C. 15cm D. 25cm E. 100cm Correct Answer: Option B – 4cm
The image of an object placed at the center of the curvature of a concave mirror is?
A. Inverted and magnified B. at the principal focus C. real and diminshed D. Erect and virtual E. at the center of the curvature Correct Answer: Option E – at the center of the curvatureA hygrometer is an instrument used to measure?
A. Dew point B. Temperature C. Relative density D. Relative humidity E. Vapour pressure Correct Answer: Option D – Relative humidity
A steam trap is a component of apparatus used in determining the specific latent heat of vaporization of steam. In the steady-state, the steam trap
A. stores the steam for future use B. prevents the steam from escaping C. ensures that only dry steam gets into the calorimeter D. allows condensed steam to go into the calorimeter E. determines the quantity of steam used Correct Answer: Option C – ensures that...A tap supplies water at 30°C while another supplies at 86°C. If a man wishes to bath with water at 44°C, calculate the ratio of mass of hot water to that of cold water required
A. 1:3 B. 3:1 C. 3:7 D. 7:3 E. 15:8 Correct Answer: Option A – 1:3Products
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