MCQ
The work done against gravity in taking $10 \mathrm{~kg}$ mass at $1 \mathrm{~m}$ height in lsec will be
- A$49 \mathrm{~J}$
- ✓$98 \mathrm{~J}$
- C$196 \mathrm{~J}$
- DNone of these
✓
Answer
Correct option: B.
$98 \mathrm{~J}$
Work done $=m g h=10 \times 9.8 \times 1=98 \mathrm{~J}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A body moves due East with velocity $20 km / hour$ and then due North with velocity $15 km / hour$. The resultant velocity
→A free body of mass $8 \mathrm{~kg}$ is travelling at 2 meter per second in a straight line. At a certain instant, the body splits into two equal parts due to internal explosion which releases 16 joules of energy. Neither part leaves the original line of motion finally
→Which of the following relations is true
The magnifying power of an astronomical telescope is $8$ and the distance between the two lenses is $54 \mathrm{~cm}$. The focal length of eye lens and objective lens will be respectively
→Oxygen is $16$ times heavier than hydrogen. Equal volumes of hydrogen and oxygen are mixed. The ratio of speed of sound in the mixture to that in hydrogen is
→A force of $(3 \hat{i}+4 \hat{j})$ Newton acts on a body and displaces it by $(3 \hat{i}+4 \hat{j}) m$. The work done by the force is
→Find the change in the entropy in the following process $100 \mathrm{gm}$ of ice at $0^{\circ} \mathrm{C}$ melts when dropped in a bucket of water at $50^{\circ} \mathrm{C}$ (Assume temperature of water does not change)
→A particle of mass $\mathrm{m}$ moving with horizontal speed $6 \mathrm{~m} / \mathrm{sec}$ as shown in figure. If $m \ll M$ then for one dimensional elastic collision, the speed of lighter particle after collision will be
→
A block of steel of size $5 cm \times 5 cm \times 5 cm$ is weighed in water. If the relative density of steel is 7 , its apparent weight is
→An aeroplane is flying horizontally with a velocity of $600 km / h$ at a height of $1960 m$. When it is vertically at a point A on the ground, a bomb is released from it. The bomb strikes the ground at point $B$. The distance $A B$ is
→