MCQ
Suppose the earth suddenly stops attracting objects placed near surface. A person standing on the surface of the earth will:
- ✓Remain standing.
- BFly up.
- CSink into earth.
- DEither $(b)$ or $(c).$
✓
Answer
Correct option: A.
Remain standing.
If downward force on the earth stops,
so upward self adjusting force also stop.
In vertical direction, there is no force. Due to inertia person resists any change to its state of rest.
Person will remain standing.
so upward self adjusting force also stop.
In vertical direction, there is no force. Due to inertia person resists any change to its state of rest.
Person will remain standing.
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 standing wave is represented by:
$
y=a \sin (100 t) \cos (0.01 x)
$
where y and a are in millimetre, t in second and x in metre. Velocity of wave is:
→$
y=a \sin (100 t) \cos (0.01 x)
$
where y and a are in millimetre, t in second and x in metre. Velocity of wave is:
A ball $P$ collides with another identical ball $Q$ at rest. For what value of coefficient of restitution $e$ , the velocity of ball $Q$ become two times that of ball $P$ after collision
→A small drop of water falls from rest through a large height $h$ in air; the final velocity is
→A gas taken through cyclic process $ABCA$ is shown in figure. If $2.4\,cal.$ of heat is given in the process, what is value of $J$ ...... $J/cal$ (mechanical equivalent of heat)?
→An ideal gas follows a process described by $p V^2=C$ from $\left(p_1, V_1, T_1\right)$ to $\left(p_2, V_2, T_2\right)$ and $C$ is a constant. Then,
→A glass flask of volume $200 \,cm ^3$ is just filled with mercury at $20^{\circ} C$. The amount of mercury that will overflow when the temperature of the system is raised to $100^{\circ} C$ is ........ $cm ^3$ $\left(\gamma_{\text {glase }}=1.2 \times 10^{-5} / C ^{\circ}, \gamma_{\text {mercury }}=1.8 \times 10^{-4} / C^{\circ}\right)$
→The volume of an ideal gas $(\gamma=1.5)$ is changed adiabatically from $5$ litres to $4$ litres. The ratio of initial pressure to final pressure is:
→A student determined Young's Modulus of elasticity using the formula $Y=\frac{M g L^{3}}{4 b d^{3} \delta} .$ The value of $g$ is taken to be $9.8 \,{m} / {s}^{2}$, without any significant error, his observation are as following.
→| Physical Quantity | Least count of the Equipment used for measurement | Observed value |
| Mass $({M})$ | $1\; {g}$ | $2\; {kg}$ |
| Length of bar $(L)$ | $1\; {mm}$ | $1 \;{m}$ |
| Breadth of bar $(b)$ | $0.1\; {mm}$ | $4\; {cm}$ |
| Thickness of bar $(d)$ | $0.01\; {mm}$ | $0.4 \;{cm}$ |
| Depression $(\delta)$ | $0.01\; {mm}$ | $5 \;{mm}$ |
Then the fractional error in the measurement of ${Y}$ is
The position-time graphs for two students $A$ and $B$ returning from the school to their homes are shown in figure
→$(A)$ $A$ lives closer to the school
$(B)$ $B$ lives closer to the school
$(C)$ $A$ takes lesser time to reach home
$(D)$ $A$ travels faster than $B$
$(E)$ $B$ travels faster than $A$
Choose the correct answer from the options given below :
Given below are two statements :
→$Statement$ $(I)$ : Planck's constant and angular momentum have same dimensions.
$Statement$ $(II)$ : Linear momentum and moment of force have same dimensions.
In the light of the above statements, choose the correct answer from the options given below :