Recent questions tagged chapter3

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A graph of `x` versus `t` is shown in figure. Choose correct statement given

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Match the Column I with Column II and select the correct option from the codes given below. Column I Column II A. `dv'/'dt` p. Acceleration B. `d|v|'/'dt q. Rate of change of speed C. `(d r)/(dt)` r. Velocity D. `(d|r|)/(dt)` s. Magnitude of velocity

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Given x-t graph represents the motion of an object. Match the Column I (parts of graph) with Column II (representation) and select the correct option from the codes given below. Column I Column II A. Part OA of graph p. Positive velocity B. Part AB of graph q. Object at rest C. Part BC of graph r. Negative velocity D. Point A in the graph s. Change in direction of motion

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Match the Column I (position-time graph) with Column II (representation) and select the correct option from the codes given

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: In real-life, in a number of situations, the object is treated as a point object. Reason: An object is treated as point object, as far as its size is much smaller than the distance, it moves in a reasonable duration of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: If the displacement of the body is zero, the distance covered by it may not be zero. Reason: Displacement is a vector quantity and distance is a scalar

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: An object can have constant speed but variable velocity. Reason: SI unit of speed is

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: The speed of a body can be negative. Reason: If the body is moving in the opposite direction of positive motion, then its speed is

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: For motion along a straight line and in the same direction, the magnitude of average velocity is equal to the average speed. Reason: For motion along a straight line and in the same direction, the magnitude of displacement is not equal to the path

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: An object may have varying speed without having varying velocity. Reason: If the velocity is zero at an instant, the acceleration is zero at that

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: Acceleration of a moving particle can change its direction without any change in direction of velocity. Reason: If the direction of change in velocity vector changes, direction of acceleration vector does not

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: The `v-t` graph perpendicular to time axis is not possible in practice.Reason: Infinite acceleration cannot be realised in

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: In realistic situation, the `x-t, y-t and a-t` graphs will be smooth. Reason: Physically acceleration and velocity cannot change values abruptly at an

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: A body cannot be accelerated, when it is moving uniformly. Reason: When direction of motion of the body changes, then body does not have

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: For uniform motion, velocity is the same as the average velocity at all instants. Reason: In uniform motion along a straight line, the object covers equal distances in equal intervals of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: A body is momentarily at rest at the instant, if it reverse the direction. Reason: A body cannot have acceleration, if its velocity is zero at a given instant of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: In the `s-t` diagram as shown in figure, the body starts moving in positive direction but not from `s= 0`.Reason At `t = t_0`, velocity of body changes its direction of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: If acceleration of a particle moving in a straight line varies as `a prop t^n` then `s prop t^(n+2)` . Reason: If `a-t` graph is a straight line,then `s-t` graph may be a

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Average Speed and Average Velocity-When an object is in motion, its position changes with time. So, the quantity that describes how fast is the position changing w.r.t. time and in what direction is given by average velocity.It is defined as the change in position or displacement `(Deltax)` divided by the time interval `(Delta t)` in which that displacement occur. However, the quantity used to describe the rate of motion over the actual path, is average speed. It defined as the total distance travelled by the object divided by the total time taken.A `250 m` long train is moving with a

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Average Speed and Average Velocity-When an object is in motion, its position changes with time. So, the quantity that describes how fast is the position changing w.r.t. time and in what direction is given by average velocity.It is defined as the change in position or displacement `(Deltax)` divided by the time interval `(Delta t)` in which that displacement occur. However, the quantity used to describe the rate of motion over the actual path, is average speed. It defined as the total distance travelled by the object divided by the total time taken.A truck requires 3 hr to complete a journey

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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