Two bodies of masses 3.0 kg and 2.0 kg are separated by a distance of 50 cm. Calculate the force of attraction between them. [G = 6.67 x 10¯¹¹ Nm² kg² ]
A. 1.6 x 10−9N B. 1.3 x 103N C. 2.3 x 103N D. 5.0x 103N Correct Answer: Option A = 1.6 x 10−9N Explanation Using the formula F = Gm1m2/r2 = 6.67×10−11×3.0×2.0/(50)2 = 40.02×10−11/2500 = 1.6 x...
A rectangular piece of iron measuring 4 cm by 3 cm at 20°C is heated until its temperature increases by 100°C. Calculate the new area of the metal. [Linear expansivity of iron is 1.2 x 10^−5 K¯¹]
A rectangular piece of iron measuring 4 cm by 3 cm at 20°C is heated until its temperature increases by 100°C. Calculate the new area of the metal. [Linear expansivity of iron is 1.2 x 10^−5 K¯¹] A. 12.0144 cm3 B. 12.0346 cm3 C. 12.0288 cm3 D. 12.0173 cm3 Correct...
A ray of light traveling from a rectangular glass block of refractive index 1.5 into air strikes the block at an angle of incidence of 30. Calculate its angle of refraction.
A. 48.6° B. 19.5° C. 20.0 D. 45.0 Correct Answer: Option B = 19.5° Explanation n = sini/sinr=sin30°/sinr 1.5 = sin30°/sinr 1.5 sin r = sin30°/1.5=0.51.5 sin r = 0.3333 = 19.47°
Which of the following devices is used for storing electric charges?
A. Transformer B. Ammeter C. Potentiometer D. Capacitor Correct Answer: Option D – Capacitor
Which of the following statements is the correct reason for using soft iron in making the armature or an electric bell?
A. It is a diamagnetic material B. It loses its magnetism readily C. It is not easily magnetized D. It retains its magnetism for a long time Correct Answer: Option B – It loses its magnetism readilyProducts
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