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Practice Test - Physics 32

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Question 1

A parallel plate condenser with a dielectric constant K between the plates has a capacity C and is charged to a potential V volts. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in the process is

Question 2

Suppose the gravitational force varies inversely as the nth power of distance. Then, the time period of planet in around circular orbit of radius R around the sun will be proportional to

Question 3

A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about scale reading is

Question 4

The magnetic lines of force inside a bar magnet

Question 5

A thin liquid film formed between a U-shaped wire and a light slider supports a weight of 1.5 × 10^–2 N (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is

Question 6

A wire suspended vertically from one of its ends stretched by attaching weight of 200 N to the lower end. The weight stretches the wire by 1 mm. Then the elastic energy (in J) stored in the wire is

Question 7

A parachute falls from an airplane moving with uniform horizontal velocity V. At the moment he just touches the ground-

Question 8

A spring of spring constant 5 × 10³ N/m is stretched initially by 5 cm from the unstretched position. Then the work required to stretch is further by another 5 cm is

Question 9

A force of 16 N is applied on a block of mass 4 kg with μ = 0.6. Then the force of friction acting on the block is
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