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
$R=4 H$
$R=4 H$
$\frac{\mathrm{U}^{2} \times 2 \sin \theta \cos \theta}{\mathrm{g}}=4 \times \frac{\mathrm{U}^{2} \sin ^{2} \theta}{2 \mathrm{g}}$
$\tan \theta=1 \quad\left[\theta=45^{\circ}\right]$
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 material has Poisson's ratio $0.5$. If a uniform rod of it suffers a longitudinal strain of $3 \times 10^{-3}$, what will be percentage increase in volume is .......... $\%$
→$Assertion$ : The dimensional formula for relative velocity is same as that of the change in velocity.
→$Reason$ : Relative velocity of $P$ w.r.t. $Q$ is the ratio of velocity of $P$ and that of $Q$.
A refrigerator is to maintain eatables kept inside at $9^{\circ} C .$ If room temperature is $36^{\circ} C$ calculate the coefficient of performance.
→An object starts $5m$ from origin and moves with an initial velocity of $5\ ms^{-1}$ and has an acceleration of $2\ ms^{-2}$. After $10\sec,$ the object is how far from the origin?
→A flywheel rotates about an axis. Due to friction at the axis, it experiences an angular retardation proportional to its angular velocity. If its angular velocity falls to half while it makes $n$ rotations, how many more rotations will it make before coming to rest?
→A screw gauge with a pitch of $0.5 \ mm$ and a circular scale with $50$ divisions is used to measure the thickness of a thin sheet of Aluminium. Before starting the measurement, it is found that wen the two jaws of the screw gauge are brought in contact, the $45^{th} $division coincides with the main scale line and the zero of the main scale is barely visible. What is the thickness of the sheet (in $mm$) if the main scale reading is $0.5\ mm$ and the $25^{th}$ division coincides with the main scale line
→In an experiment, the percentage of error occurred in the measurment of physical quantities $A, B, C$ and $D$ are $1 \%, 2 \%, 3 \%$ and $4 \%$ respectively. Then the maximum percentage of error in the measurement $X,$
→where $X = \frac{{{A^2}{B^{\frac{1}{2}}}}}{{{C^{\frac{1}{3}}}{D^3}}}$, will be
Graph of specific heat at constant volume for a monoatomic gas is
In an experiment of simple pendulum time period measured was $50\,sec$ for $25$ vibrations when the length of the simple pendulum was taken $100\,cm$ . If the least count of stop watch is $0.1\,sec$ . and that of meter scale is $0.1\,cm$ then maximum possible error in value of $g$ is .......... $\%$
→A charge q is placed at the centre of the open end of a cylindrical vessel (figure). The flux of the electric field through the surface of the vessel is:
