Class XI Physics Exam Prep
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Class XI Physics Exam Prep
English 20 leveled MCQs Free
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Sample questions with model answers
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3 marks Medium answer
The distance of two planets from the sun are $10^{13}$ and $10^{12}$ m respectively. Find the ratio of time periods and speeds of the two planets.
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Ratio of time periods is $\sqrt{10}$ and speeds is $\sqrt{10}$.
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3 marks Medium answer
A particle is projected upward from the surface of the earth (radius R) with a Kinetic Energy equal to half the minimum value needed for it to escape. To which height does it rise above the surface of the earth?
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Height is $\frac{R}{2}$.
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3 marks Medium answer
A block of mass 25 kg is raised by a 50 kg man in two different ways as shown below. What is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding?
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Use the pulley method to avoid yielding.
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3 marks Medium answer
A bullet of mass 0.01 kg and travelling at a speed of 500 m/s strikes a block of mass 2 kg which is suspended by a string of length 5 m. The centre of gravity of the block is found to rise a vertical distance of 0.1 m. What is the speed of the bullet after it emerges from the block? Take $g = 9.8 \text{ m/s}^2$.
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Use conservation of momentum and energy principles.
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1 marks Short answer
A simple pendulum has a time period $T_1$ when on the earth's surface, and $T_2$ when taken to a height R above the earth's surface, where R is the radius of the earth. The value of $T_2/T_1$ [use $T = 2\pi\sqrt{(l/g)}$]
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$\sqrt{2}$
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1 marks Short answer
The number of significant figures in 0.06900 is
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4
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1 marks Short answer
Two spheres of mass m and M are situated in air and gravitational force between them is F. The space around the mass is now filled with a liquid of relative density 3. The gravitational force will now be
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F/3
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1 marks Short answer
If momentum (p), area (A) and time (T) are taken to be fundamental quantities, then energy has the dimensional formula
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[p^2 A^1 T^1]
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1 marks Short answer
If a planet existed whose mass and radius were both half of those of the earth, what would be the acceleration due to gravity on its surface as compared to what it is on the earth's surface?
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g/4
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1 marks Short answer
A particle is projected at $60^\circ$ to the horizontal with a kinetic energy K. The kinetic energy at the highest point is
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K/2
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1 marks Short answer
A ball is thrown vertically upward. It has a speed of 10 m/s when it has reached one-half of its maximum height. How high does the ball rise? Take $g = 10 \text{ m/s}^2$
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15 m
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1 marks Short answer
If $\vec{A} \times \vec{B} = \vec{B} \times \vec{A}$, then the angle between $\vec{A}$ and $\vec{B}$ is
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$\pi$
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1 marks Short answer
Sand is being dropped on a conveyor belt at the rate of M kg/s. The force necessary to keep the belt moving with a constant velocity of v m/s will be
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Mv
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1 marks Short answer
A block of mass m is in contact with the cart as shown in figure. The coefficient of static friction between the block and the cart is $\mu$. The acceleration $\alpha$ of the cart that will prevent the block from falling satisfies
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$\alpha \ge g/\mu$
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1 marks Short answer
If a long spring is stretched by 0.02 m, its potential energy is U. If the spring is stretched by 0.1 m then its potential energy will be
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25 U
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1 marks Short answer
A and B are two vectors and $\theta$ is the angle between them, if $\sqrt{3} |\vec{A} \times \vec{B}| = (\vec{A} \cdot \vec{B})$, then value of $\theta$ is
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$30^\circ$
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1 marks Short answer
Assertion: A body can have acceleration even if its velocity is zero at that instant of time. Reason: The body will be momentarily at rest when it reverses its direction of motion.
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Both A and R are true and R is the correct explanation of A
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1 marks Short answer
Assertion: For a given time interval, average velocity is single value while average speed can have many values. Reason: Velocity is a vector quantity and speed is a scalar quantity.
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Both A and R are true and R is the correct explanation of A
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1 marks Short answer
Assertion: The scalar product of two vectors can be zero. Reason: If two vectors are perpendicular to each other, their scalar product will be zero.
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Both A and R are true and R is the correct explanation of A
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1 marks Short answer
Assertion: The co-efficient of restitution is the negative ratio of relative velocities of bodies after and before collision. Reason: Co-efficient of restitution is a measure of the degree of elasticity of a collision.
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Both A and R are true but R is not the correct explanation of A
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