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qUESTIONS

MCQs-PYQs-12th-jee

A wind with speed 40m/s blows parallel to the roof of a house. The area of the roof is 250m ^ 2 Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be: (P air =1.2kg/m^ 3 )

MCQs-PYQs-12th-jee

The cylindrical tube of a spray pump has radius, R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is V, the speed of the ejection of the liquid through the holes is

MCQs-PYQs-12th-jee

Two non-mixing liquids of densities p and np(n ) 1) are put in a container. The height of each liquid is h. A solid cylinder of length Land density d is put in this container. The cylinder floats with its axis vertical and length pL(p ( 1) in the denser liquid. The density d is equal to

MCQs-PYQs-12th-jee

A U tube with both ends open to the atmosphere, is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10 mm above the water level on the other side. Meanwhile the water rises by 65 mm from its original level (see diagram). The density of the oil is

MCQs-PYQs-12th-jee

The value of coefficient of volume expansion of glycerine is 5 * 10 ^ – 4 * k ^ – 1 The fractional change in the density of glycerine for a rise of 40°C in its temperature is

MCQs-PYQs-12th-jee

The heart of man pumps 5 litres of through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be 13.6×10 kg/m³ and g = 10m/s² the power of heart in watt is

MCQs-PYQs-12th-jee

Bernoulli’s equation is based on the law of conservation of

MCQs-PYQs-12th-jee

According to Bernoulli’s equation (P/pg)+h+1/2(v^2/g) = constant. The terms A, B and C are generally called respectively

MCQs-PYQs-12th-jee

The working of an atomizer depends on

MCQs-PYQs-12th-jee

Water containing air bubbles flows without turbulence through a horizontal pipe which has a region of narrow cross – section. In this region the bubbles

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