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## The basic principle of operation of a beam balance is?

A. Hooke’s law B. Archimedes principle C. law of flotation D. principle of moments Correct Answer: Option D – principle of moments Explanation Hooke’s Law states that the extension of a spring is proportional to the load that is applied to it. A...

## In which of the following situations is friction not useful?

A. Operation of a grinding machine B. Walking C. Application of brakes D. Moving piston in a sleeve Correct Answer: Option D – Moving piston in a sleeve Explanation friction, force that resists the sliding or rolling of one solid object over another. Examples of...

## The viscosity of a fluid depends on the following factors except the?

A. relative motion between the layers of the fluid B. nature of the material of the fluid C. surface area of the fluid in contact D. normal reaction in the fluid Correct Answer: Option D – normal reaction in the fluid Explanation The viscosity of a material is...

## Using venier calipers; which of the following readings gives the correct measurement for the length of a rod?

A. 4.1 cm B. 4.13cm C. 125 cm D. 1254 cm Correct Answer: Option B = 4.13cm Explanation Vernier calipers commonly used in industry provide a precision to 0.01 mm (10 micrometres), or 0.01cm or one thousandth of an inch. Usually, it is the total length of the main...

## A small object of mass 50 g is released from a point A. Determine the velocity of the object when it reaches point B; a vertical distance of 30m below A. [g = 10 ms−2]

A. 1.5 ms−1 B. 6.0 m s−1 C. 17.3 m s−1 D. 24.5 m s−1 Correct Answer: Option D = 24.5 m s−1 Explanation v = ?, u = 0, a = 10, s = 30 V² = U²+2as V² = 0 + 2 * 10 * 30 V² = 0 + 600 V = √600 V =...

## A quantity of water at 0 °C is heated to 30 °C. For each degree rise in temperature, its density will?

A. rise steadily B. fall steadily C. fall and then rises D. rise and then falls Correct Answer: Option B – fall steadily Explanation When a liquid or gas is heated, the molecules move faster, bump into each other, and spread apart. This is Because the molecules...