Two charges are placed at certain distance apart in air. When a metallic sheet is placed between them, the electrostatic force between them will
(a)
decrease
(b)
increase
(c)
remain unchanged
(d)
become zero
Chlorine acts as a bleaching agent only in presence of
(a)
dry air
(b)
moisture
(c)
sunlight
(d)
pure oxygen
aa
Let g(x) be a continuous function such that 0ò1 g(t) dt = 2. Let f(x) = 1/2 0òx (x-t)2 g(t) dt then find f ’(x) and hence evaluate f “(x).
Two
equal particles are attached to the end of a light rod and a 3rd equal particle
is connected by an inextensible string to a point on the rod at distance a and b from its
ends. The latter particle is projected at right angles to the rod with a velocity
vo. Show that when the string becomes taut […]
A uniform thin rod AB of mass 3m and length 2a is free to rotate in a horizontal plane about a smooth fixed vertical axis which passes through the midpoint O of the rod. Two small smooth rings each of mass m are free to slide on the rod. At time t=0 the rings […]
How much energy would be required to heat two moles of methane by one degree if the gas is kept at constant volume?
6.5 calories
8.5 calories
11 calories
13 calories
Answer: D Select the row using Mouse to view the answer
Let X be the energy needed to raise the temperature of 5 moles of nitrogen held at constant pressure by one degree. Let Y be the energy needed to raise 5 moles of carbon monoxide by one degree with the pressure held constant. What is the ratio X:Y?
5:7
1:1
7:5
7:9
Answer: B Select the row using Mouse to […]
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