![The change in volume when 450kg of ice is completely melted is? [density of ice = 900 kgm−³; density of water = 100 kgm−³]](https://erudites.ng/wp-content/uploads/2020/06/past-questions-and-answers.jpg)
When left in a freezer; a bottle full of water cracks on freezing into ice because of the?
A. increase in the volume of water B. contraction of the bottle C. expansion of the bottle D. decrease in the volume of water Correct Answer: Option A = increase in the volume of water
If U is the object distance and V the image distance; which of the following expressions gives the linear magnification produced by a convex lens of focal length f?
A. u/f + f B. u/v +1 C. v/f + 1 D. v/f – 1 Correct Answer: Option D = v/f – 1 Explanation Magnification, M = v/u = v (1/u) And for the Lens formula 1/u + 1/v = 1/f => 1/u = 1/f – 1/v ∴M = V(1/u) = V(1/f – 1/v) = v/f – v/v = v/f –...
The pitch of a sound note depends on?
A. timbre B. frequency C. harmonics D. quality Correct Answer: Option B = frequency
A person can focus an object only when it lies within 200cm from him. Which spectacles should be used to increase his maximum distance of distinct vision infinity?
A. Convex lens B. Binoculars C. Concave lens D. Plane glasses Correct Answer: Option C – Concave lens Explanation A person with this condition is said to be short-sighted. Hence, to correct it, a concave lens is used for...
A ray of light makes an angle of 35° with a plane mirror. What is the angle of reflection?
A. 35° B. 55° C. 70° D. 65° Correct Answer: Option B = 55° Explanation 35° =35° = 70° 180 – 70 = 110 110/2 = 55°Products
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