Given below are two statements : one is labelled as Assertion A a… - Vidyadip

MCQ

Given below are two statements : one is labelled as Assertion $A$ and the other is labelled as Reason $R$.

Assertion $A$ : When a body is projected at an angle $45^{\circ}$, it's range is maximum.

Reason $R$ : For maximum range, the value of $\sin 2 \theta$ should be equal to one.

In the light of the above statements, choose the correct answer from the options given below :

A
Both $A$ and $R$ are correct but $R$ is NOT the correct explanation of $A$
✓
Both $A$ and $R$ are correct $R$ is the correct explanation of $A$
C
$A$ is true but $R$ is false
D
$A$ is false but $R$ is true

✓

Answer

Correct option: B.

Both $A$ and $R$ are correct $R$ is the correct explanation of $A$

b
$R =\frac{ u ^2}{ g } \sin 2 \theta$

$R$ is maximum for $2 \theta=90^{\circ}$.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 3.2 , motion in plane→3.2 , motion in plane — all question types→Physics STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

The graph shows the variation of velocity of a rocket with time. Then, the maximum height attained by the rocket is ...........$km$ :-

A sonometer wire of length $114\, cm$ is fixed at both the ends. Where should the two bridges be placed so as to divide the wire into three segments whose fundamental frequencies are in the ratio $1 : 3 : 4$ ?

A car is travelling with linear velocity $v$ on a circular road of radius $r$. If it is increasing its speed at the rate of $'a'$ $meter/{\sec ^2}$, then the resultant acceleration will be

When no current is passed through a conductor:

The free electrons do not move.
The average speed of a free electron over a large period of time is zero.
The average velocity of a free electron over a large period of time is zero.
The average of the velocities of all the free electrons at an instant is zero.

Mass m₁moves on a slope making an angle $\theta$ with the horizontal and is attached to mass m₂ by a string passing over a frictionless pulley as shown in The co-efficient of friction between m₁ and the sloping surface is $\mu$.
Which of the following statements are true?

If m₂ > m₁ $\sin\theta,$ the body will move up the plane.
If m₂ > m₁ $(\sin\theta+\mu\cos\theta),$ the body will move up the plane.
If m₂ < m₁ $(\sin\theta+\mu\cos\theta),$ the body will move up the plane.
If m₂ < m₁ $(\sin\theta-\mu\cos\theta),$ the body will move down the plane.

There is small hole in a hollow sphere. The water enters in it when it is taken to a depth of $40 \,cm$ under water. The surface tension of water is $0.07 \,N / m$. The diameter of hole is .......... $mm$

The displacement-time graphs of two moving particles make angles of 30° and 45° with the x-axis. The ratio of their velocities is:

In a mixture of gases at a fixed temperature:

‘Gulab Jamuns’ (assumed to be spherical) are to be heated in an oven. They are available in two sizes, one twice bigger (in radius) than the other. Pizzas (assumed to be discs) are also to be heated in oven. They are also in two sizes, one twice big (in radius) than the other. All four are put together to be heated to oven temperature. Choose the correct option from the following:

A body of mass $2\, kg$ is situated at a height $5\, m$ above the ground. It's potential energy is reported as $70\, J$ . Potential energy of a $3\, kg$ body situated at height $1\,m$ above ground will be reported ................ $\mathrm{J}$