A ray of light passing through the centre of curvature of a concave mirror is reflected by the mirror at?
A. 0° B. 45° C. 90° D. 180° Correct Answer: Option A – 0°
A man 1.5m tall is standing 3m in front of a pinhole camera whose distance between the hole and the screen is 0.1m. What is the height of the image of the man on the screen?
A. 0.05m B. 0.15m C. 0.30m D. 1.00m Correct Answer: Option A – 0.05m Explanation hi=(ho×V)/u hi=(1.5×0.1)/3 = 0.05m
If a sonometer has a fundamental frequency of 450HZ; what is the frequency of the fifth overtone?
A. 2700Hz B. 456Hz C. 444Hz D. 75Hz Correct Answer: Option A – 2700Hz Explanation 5th Overtone = 6fo = 6 x 450 = 2700Hz
What is the velocity of sound at 100°C if the velocity of sound at 0°C is 340ms−¹?
A. 497m−¹ B. 440m−¹ C. 397m−¹ D. 240m−¹ Correct Answer: Option C – 397m−¹ Explanation V∝√T ⇒ V1/√T1=V2/√T2 Using the above formula, we get V2≊397ms−¹Products
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