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 : 5 Explanation Wt. in air = 0.25 N Wt.in water = 0.15 N therefore lost in wt. in water = Upthrust in water = 0.25 – 0.15 = 0.10 N. Wt. in paraffin oil = 0.17 N. .. loss in wt.in oil = upthrust...
If the uncertainty in the measurement of the position of a particle is 5.0 x 10^-10m, the uncertainty in the momentum of the particle is?
A. 1.32 x 10-44Ns B. 3.30 x 10-44Ns C. 1.32 x 10-24Ns D. 3.30 x 10-24Ns Correct Answer: Option C – 1.32 x 10-24Ns
Given that young’s modulus for aluminium is 7.0 x 10¹°Nm−² and density is 2.7 x 10³kgm−³. Find the speed of the sound produced if a solid bar is struck at one end with a hammer
A. 5.1 x 103ms-1 B. 4.2 x 103ms-1 C. 3.6 x 103ms-1 D. 2.8 x 103ms-1 Correct Answer: Option A – 5.1 x 103ms-1
A force of 100N was used to kick a football of mass 0.8kg. Find the velocity with which the ball moves if it takes 0.8s to be kicked?
A. 32ms−¹ B. 50ms−¹ C. 64ms−¹ D. 100ms−¹ Correct Answer: Option D – 100ms−¹
An electron makes a transition from a certain energy level Ek to the ground state E0. If the frequency of emission is 8.0 x 10^14Hz. The energy emitted is?
A. 8.25 x 10-19J B. 5.28 x 10-19J C. 5.28 x 1019J D. 8.25 x 1019J Correct Answer: Option B – 5.28 x 10-19J Explanation Atomic emission and absorption of energy is usually in packets referred to as photon or quantum of energy of magnitude E =hf, where f is the...Products
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