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The velocity ($v$)-time ($t$) plot of the motion of a body is shown below: The acceleration ($a$)-time ($t$) graph that best suits this motion is:
A car moving with a velocity of $10 \text{ m/s}$ can be stopped by the application of a constant force $F$ in a distance of $20 \text{ m}$. If the velocity of the car is $30 \text{ m/s}$, it can be stopped by this force in:
Which of the following velocity-time graphs represent uniform motion?
A particle starts from rest, accelerates at $2 \text{ m/s}^2$ for $10 \text{ s}$ and then goes for constant speed for $30 \text{ s}$ and then decelerates at $4 \text{ m/s}^2$ till it stops. What is the distance travelled by it?
The initial velocity of a body moving along a straight line is $7 \text{ m/s}$. It has a uniform acceleration of $4 \text{ m/s}^2$. The distance covered by the body in the 5th second of its motion is:
A packet is dropped from a balloon which is going upwards with the velocity $12 \text{ m/s}$, the velocity of the packet after $2 \text{ seconds}$ will be:
Which of the following velocity-time graphs shows a realistic situation for a body in motion?
If a body is thrown up with the velocity of $15 \text{ m/s}$, then the maximum height attained by the body is: (assume $g = 10 \text{ m/s}^2$)
The solids which have the negative temperature coefficient of resistance are:
A small block slides down on a smooth inclined plane starting from rest at time $t=0$. Let $S_n$ be the distance traveled by the block in the interval $t=n-1$ to $t=n$. Then the ratio $\frac{S_n}{S_{n+1}}$ is:
The time of reverberation of a room $A$ is one second. What will be the time (in seconds) of reverberation of a room, having all the dimensions double those of room $A$?
The acceleration due to gravity on the planet A is $9$ times the acceleration due to gravity on planet B. A man jumps to a height of $2 \text{ m}$ on the surface of A. What is the height of jump by the same person on the planet B?
A body falling from a high Minaret travels $40 \text{ m}$ in the last $2 \text{ s}$ of its fall to the ground. The height of the Minaret in meters is: (take $g=10 \text{ m/s}^2$)
A body is falling freely in a resistive medium. The motion of the body is described by $\frac{dv}{dt} = (4 - 2v)$, where $v$ is the velocity of the body at any instant (in $\text{m s}^{-1}$). The terminal velocity in this case refers to the velocity the body approaches as time $t \to \infty$. The initial acceleration and terminal velocity of the body, respectively, are:
The correct Boolean operation represented by the circuit diagram given above is:
A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27$^{\circ}$C. Its density is : (R = 8.3 J mol$^{-1}$ K$^{-1}$)
Time taken by an object falling from rest to cover the height of $h_1$ and $h_2$ is respectively $t_1$ and $t_2$. Then the ratio of $t_1$ to $t_2$ is:
Electron volt is a unit of
The energy required to break one bond in DNA is $10^{-20}\text{ J}$. This value in eV is nearly:
Two bodies of different masses $m_a$ and $m_b$ are dropped from two different heights $a$ and $b$. The ratio of the time taken by the two to cover these distances is: