physics

The radiator of a motor car is cooled by?

A. radiation B. conduction C. convection D. radiation and conduction Correct Answer: Option C - convection Explanation The function of…

4 years ago

A coin place below a rectangular glass block of thickness 9cm and refractive index 1.5 is viewed vertically above the block. The apparent displacement of the coin is?

A. 3 cm B. 5 cm C. 6 cm D. 8 cm Correct Answer: Option A - 3 cm Explanation…

4 years ago

The effect of a particle in a fluid attaining its terminal velocity is that the?

A. acceleration is maximum B. weight is equal to the retarding force C. buoyancy force is equal to the viscous…

4 years ago

A particle in circular motion performs 30 oscillation in 6 seconds. Its angular velocity is?

A. 5 rads-1 B. 6 rads-1 C. 5π rads-1 D. 10π rads-1 Correct Answer: Option D = 10π rads-1 Explanation…

4 years ago

Two force each of 10N acts on a body; one towards the north and the other towards the east. The magnitude and the direction of the resultant force are

A. 20N, 45°E B. 20N, 45°W C. 10√2N, 45°W D. 10√2N, 45°E Correct Answer: Option D = 10√2N, 45°E Explanation…

4 years ago

If the distance between two suspended masses 10kg each is tripled; the gravitational force of attraction between them is reduced by?

A. one half B. one third C. one quarter D. one-ninth Correct Answer: Option D - one-ninth Explanation Let the…

4 years ago

A body weighing 80N stands in an elevator that is about to move. The force exerted by floor on the body as the elevator moves upward with an acceleration of 5 ms−² is? [g = 10ms−²]

A. 40 N B. 80 N C. 120 N D. 160 N Correct Answer: Option D - 160 N Explanation…

4 years ago

The hydrostatic blood pressure difference between the head and the feet of a boy standing straight is 1.65 x 10^4 Nm−². Find the height of the boy. [Density of blood = 1.1 x 10³ kgm−³, g = 10ms−²]

A. 0.5 m B. 0.6 m C. 1.5 m D. 2.0 m Correct Answer: Option C = 1.5 m Explanation…

4 years ago

A wheel and axle is used to raise a load of 500N by the application of an effort of 250N. If the radii of the wheel and the axle are 0.4cm and 0.1cm respectively; the efficiency of the machine is?

A. 20 % B. 40 % C. 50 % D. 60 % Correct Answer: Option C - 50 % Explanation…

4 years ago

A copper cube weighs 0.25 N in air; 0.17N when completely immersed in paraffin oil and 0.15N when completely immersed in water. The ratio of upthrust in oil to upthrust in water is?

A. 3 : 5 B. 4 : 5 C. 7 : 10 D. 13 : 10 Correct Answer: Option B…

4 years ago
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