CBSE
Multiple Choice QuestionsAn alpha nucleus of energy bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to
v2
1/ m
1/ν4
1/ Ze
Amount of work which can be obtained from 200 cal heat, will be
280 J
800 J
420 J
840 J
If the heat of 110 J is added to a gaseous system, whose internal energy is 40 J, then the amount of external work done is
180J
70J
110J
30J
Which of the following is not an inelastic collision ?
A man jump on a cart
A bullet embedded in a block
Collision of two glass ball
none of the above
The spring extends by x on loading, then energy stored by the spring is (if T is the tension in spring and k is
spring constant
For inelastic collision between two spherical rigid bodies
the total kinetic energy is conserved
the total mechanical energy is not conserved
the linear momentum is not conserved
the linear momentum is conserved
A particle of mass 100 g is thrown vertically upwards with a speed of 5 m/s. The work done by the force of gravity during the time the particle goes up is
-0.5 J
-1.25 J
1.25 J
0.5 J
A force F acting on an object varies with distance x as shown here. The force is in newton and distance is in metre. The work done by the force in moving the object from x = 0 to x = 6 m is
4.5 J
13.5 J
9.0
18.0 J
A 5 A fuse wire can withstand a maximum power of 1 W in circuit. The resistance of the fuse wire is
0.2 Ω
5 Ω
0.4 Ω
0.04 Ω
A mass of M kg is suspended by a weightless string. The horizontal force that is required to displace it until the string makes an angle of 45° with the initial vertical direction is
