Eight drops of a liquid of density ρ and each of radius a are falling through air with a constant velocity 3.75 cms⁻¹. When the eight drops coalesce to from a single drop the terminal […]
Two cars A and B moving with same speed of 45 km/hr along same direction. If a third car C coming from the opposite direction with a speed of 36 km/hr meets two cars in […]
A resistor 30Ω, inductor of reactance 10 Ω and capacitor of reactance 10 Ω are connected in series to an a.c. voltage source. The current in the circuit is
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(a) 10√2 A […]
The energy released in the fission of 1 kg of ₉₂U²³⁵ is (energy per fission = 200 MeV)
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(a) 5.1 x 10²⁶ eV (b) 5.1 x 10²⁶ J (c) 8.2 x 10¹³ […]
The excess pressure inside one soap bubble is three times that inside a second soap bubble, then the ratio of their surface area is
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(a) 1 : 9 (b) 1 : 3 […]
A bullet of mass 0.05 kg moving with a speed of 80 m/s enters a wooden block and is stopped after a distance of 0.40m. The average resistive force exerted by the block on the […]
Oxidation number of iodine in IO₃⁻, IO₄⁻, KI and I₂ respectively are
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(a) -1, -1, 0 , 1 (b) 3, 5, 7, 0 (c) 5, 7, -1, 0 (d) -1, -5, -1, […]
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