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Physics NEET MCQ
Mcq On Motion In A Straight Line
Quiz 1
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Q.1
The displacement of a particle is given by $y=a+bt+ct^2-dt^4$ The initial velocity and acceleration are respectively
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b, -4d
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–b, 2c
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b, 2c
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2c, -4d
Q.2
In 1.0s, a particle goes from point A to point B, moving in a semicircle of radius 1.0 m as shown in below Figure. The magnitude of average velocity is
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3.14 m/s
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0 m/s
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2 m/s
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1 m/s
Q.3
A particle moves along a straight line such that its displacement at any time t is given by : $x=(t^3-6t^2+3t+4)$ metres The velocity when the acceleration is zero is
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-9 m/s
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42 m/s
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-15 m/s
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3 m/s
Q.4
The ratio of magnitudes of average velocity to average speed, is
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always less than one
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always equal to one
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always more than one
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equal to or more than one
Q.5
The displacement x of a particle varies with time t as $x=ae^{- \alpha t}+be^{ \beta t}$, where a, b, $\alpha$ and $\beta$ are positive constants. The velocity of the particle will
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go on decreasing with time
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be independent of $\alpha$ and $\beta$
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drop to zero when $\alpha = \beta$
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go on increasing with time
Q.6
The displacement-time graph of a moving particle is shown in
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D
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E
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C
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F
Q.7
What determines the nature of the path followed by the particle?
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Speed
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Velocity
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Acceleration
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Both (b) and (c)
Q.8
The correct statement from the following is
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A body having zero velocity will not necessarily have zero acceleration
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A body having zero velocity will necessarily have zero acceleration
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A body having uniform speed can have only uniform acceleration
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A body having non-uniform velocity will have zero acceleration
Q.9
A body is thrown vertically upwards. If air resistance is to be taken into account, then the time during which the body rises is
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equal to the time of fall.
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twice the time of fall.
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less than the time of fall.
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greater than the time of fall.
Q.10
The displacement of a body is given to be proportional to the cube of time elapsed. The magnitude of the acceleration of the body, is
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constant but not zero
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increasing with time
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zero
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decreasing with time
Q.11
A particle is thrown vertically upward. Its velocity at half of the height is 10 m/s, then the maximum height attained by it (g=$10 \ m/s^2$)
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8m
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20cm
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10cm
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16 m
Q.12
A car moves from X to Y with a uniform speed $v_u$ and returns to Y with a uniform speed $v_d$. The average speed for this round trip is
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$\sqrt {v_u v_d} $
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$\frac {v_u v_d}{v_u + v_d}$
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$\frac {v_u + v_d}{v_u v_d}$
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$\frac {2v_u v_d}{v_u + v_d}$
Q.13
If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is
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ut
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$\frac {1}{2} gt^2$
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$ut-\frac {1}{2} gt^2 $
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(u+gt)t
Q.14
Assertion : A body can have acceleration even if its velocity is zero at a given instant of time. Reason : A body is momentarily at rest when it reverses its direction of motion
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Both assertion and reason are true and reason is the correct explanation of the assertion.
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Both assertion and reason are true, but reason is not correct explanation of the assertion
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assertion is true, but reason is false.
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both assertion and reason are false.
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reason is true but assertion is false
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