MCQ
The horizontal range is four times the maximum height attained by a projectile. The angle of projection is ......... $^o$
- A${90}$
- B${60}$
- ✓${45}$
- D${30}$
✓
Answer
Correct option: C.
${45}$
c
$ R = 4H\cot \theta ,$
$ R = 4H\cot \theta ,$
if R = 4H then $\cot \theta = 1 \Rightarrow \theta = 45^\circ $
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
The $x-t$ graph of a particle moving along a straight line is shown in figure The speed-time graph of the particle is correctly shown by
→A planet revolving in elliptical orbit has
→$(A)$ a constant velocity of revolution.
$(B)$ has the least velocity when it is nearest to the sun.
$(C)$ its areal velocity is directly proportional to its velocity.
$(D)$ areal velocity is inversely proportional to its velocity.
$(E)$ to follow a trajectory such that the areal velocity is constant.
Choose the correct answer from the options given below
In a vernier callipers, $10$ divisions of vernier scale coincides with $9$ divisions of main scale, the least count of which is $0.1\,cm$. If in the measurement of inner diameter of cylinder zero of vernier scale lies between $1.3\,cm$ and $1.4\, cm$ of main scale and $2^{nd}$ division of vernier scale coincides with main scale division then diameter will be .......... $cm$
→The frequency of vibration of string is given by $\nu = \frac{p}{{2l}}{\left[ {\frac{F}{m}} \right]^{1/2}}$. Here $p$ is number of segments in the string and $l$ is the length. The dimensional formula for $m$ will be
→Assuming the earth to be a sphere of uniform mass density, the weight of a body at a depth $d=\frac{R}{2}$ from the surface of earth, if its werght on the surface of earth is $200\,N$, will be $...........\,N$ ( $Given R =$ Radrus of earth)
→$STATEMENT-1$ The stream of water flowing at high speed from a garcen hose pipe tends to spread like a fountain when held vertically up, but tends to narrow down when held vertically down. and
→$STATEMENT-2$ In any steady flow of an incompressible fluid, the volume flow rate of the fluid remains constant.
The time period of a particle executing $S.H.M.$ is $8 \,s$. At $t=0$ it is at the mean position. The ratio of distance covered by the particle in $1^{\text {st }}$ second to the $2^{\text {nd }}$ second is .............. $s$
→A stone of mass m is tied to a string and is moved in a vertical circle of radius $ r$ making n revolutions per minute. The total tension in the string when the stone is at its lowest point is
→Which statements are correct about degrees of freedom?
→$A.$ $A$ molecule with $n$ degrees of freedom has $n^{2}$ different ways of storing energy.
$B.$ Each degree of freedom is associated with $\frac{1}{2} RT$ average energy per mole.
$C.$ $A$ monoatomic gas molecule has $1$ rotational degree of freedom where as diatomic molecule has $2$ rotational degrees of freedom
$D$ $CH _{4}$ has a total to $6$ degrees of freedom Choose the correct answer from the option given below:
A metallic wire of length $L$ is fixed between two rigid supports. If the wire is cooled through a temperature difference $\Delta T$ ($Y$ = young’s modulus, $\rho$ = density, $\alpha$ = coefficient of linear expansion) then the frequency of transverse vibration is proportional to :
→