NEET 2017 Question Paper - Code A Mock Test

Which of the following statements are correct?(a) Centre of mass of a body always coincides with the centre of gravity of the body.(b) Centre of mass of a body is the point at which the total gravitational torque on the body is zero.(c) A couple on a body produce both translational and rotational motion in a body.(d) Mechanical advantage greater than one means that small effort can be used to lift a large load.

A Carnot engine having an efficiency of $\frac{1}{10}$ as heat engine, is used as a refrigerator. If the work done on the system is $10\text{J}$, the amount of energy absorbed from the reservoir at lower temperature is:

If ${\theta }_1$ and ${\theta }_2$ be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip $\theta$ is given by:

An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current ‘$I$ ’ along the same direction is shown in Fig. Magnitude of force per unit length on the middle wire ‘$B$ ’ is given by:

Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will: