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11th Physics Weekly Test - 3 (Kinematics)

MABS Institution

11th Physics Weekly Test - 3 (Kinematics)-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

A person performing a somersault is an example of__________motion.

circular
vibratory
linear
rotational

The equation y = \(\frac{8}{2u^2}x^2\) represents:

the path of a freely falling body
the path of a thrown bodies
the path of a projectile
hyperbola

A particle moves along a straight line Ox. At a time t (in seconds) the distance x (in metres) of the particle from 0 is given by x = 40 + 12t - t³• How long would the particle travel before coming to rest?

16m
24m
40m
56m

If \(\overline P-\overline Q\) then which of the following is incorrect

\(\hat P=\hat Q\)
\(|\hat P|=|\hat Q|\)
\(P\hat Q=Q\hat A\)
\(\hat P\hat Q=PQ\)

A body dropped from top of a tower fall through 40 III during the last two seconds of its fall. The height of tower is (g = 10 m/s²)

60m
45m
80m
50m

Which one of the following satatement is true?

A scalar quantity is conserved in a process
A scalar quantity does not vary from one point to another in apace
A scalar quantity can never take -ve values
A scalar quantity has only magnitude and no direction.

The speed of a train is reduced from 60 kmh^-1 to 15 kmh^-1 in a distance of 450 m. If the retardation is uniform is the distance, it will travel further before coming to rest is

25m
30m
15m
20m

The ratio of the numerical values of the average velocity and average speed ofa body is always:

unity
unity or less
unity or more
less than unity

Which of the following is not a scalar?

Volume
angular momentum
Relative density
time

The scalar product \(\vec A.\vec B\) is equal to

\(\vec A+\vec B\)
\(AB\sin\theta\)
\(AB\cos\theta\)
\(\vec B+\vec A\)

\(\hat i.\hat j\) is

0
1
\(\infty \)
none

For the figure, which of the following is correct?

\(\vec A+\vec B=\vec C\)
\(\vec B+\vec C=\vec A\)
\(\vec C+\vec A=\vec B\)
\(\vec A+\vec B+\vec C=0\)

\(X\propto \frac { 1 }{ Y } \) (or) XY = constant is represented by

During a projectile motion if the maximum height equals the horizontal range, then the angle of projection with the horizontal is:

tan^-1(1)
tan^-1(2)
tan^-1(3)
tan^-1(4)

What is the ratio of the angular speeds of the minute hand and second-hand of a clock?

1: 12
12: 1
1: 60
60: 1

Which of the following is true regarding projectile motion?

horizontal velocity of projectile is constant
vertical velocity of projectile is constant
acceleration is not constant
momentum is constant

A particle starts its motion from rest under the action of a constant force. If the distance covered in first 10 seconds is S₁ and that covered in the first 20 seconds is S₂ ,then

\(s_2=3s_1\)
\(s_2=4s_1\)
\(s_2=s_1\)
\(s_2=2s_1\)

If a body moving in a circular path with uniform speed, then

the acceleration is directed towards its centre
velocity and acceleration are perpendicular to each other
speed of the body is constant but its velocity is varying.
all the above

A bus is moving with a speed of 10 ms^-1 on a straight road. A scooterist wishes to overtake the bus in 100 s.If the bus is at a distance of I km from the scooterist, with what speed should the scooterist chase the bus?

40ms^-1
25ms^-1
10ms^-1
20ms^-1

A swimmer can swim in still water at of 10 ms^-1. While crossing a river his average speed is 6 ms^-1. If he crosses the river in the shortest possible time, what is the speed of flow of water?

16 ms^-1
4 ms^-1
60 ms^-1
8 ms^-1

Two objects of masses m₁ and m₂ fall from the heights h₁ and h₂ respectively. The ratio of the magnitude of their momenta when they hit the ground is

\(\sqrt { \frac { { h }_{ 1 } }{ { h }_{ 2 } } } \)
\(\sqrt { \frac { { { m }_{ 1 }h }_{ 1 } }{ { { m }_{ 2 }h }_{ 2 } } } \)
\(\frac { { m }_{ 1 } }{ { m }_{ 2 } } \sqrt { \frac { { h }_{ 1 } }{ { h }_{ 2 } } } \)
\(\frac { { m }_{ 1 } }{ { m }_{ 2 } } \)

A ball is dropped from a high rise platform at t = 0 starting from rest. After 6 seconds another ball is thrown downwards from the same platform with a speed v. The two balls meet at t = 18 s. What is the value of v? (Take g = 10 m/s²)

75m/s
55m/s
40m/s
60m/s

It is found that \(\left|A+B\right|=\left|A\right|.\) This necessarily implies

B=0
A, B are anti-parallel
A, B are perpendicular
\(A,B\le 0\)

Y = 1 - e^-kx is represented by

An object is dropped from rest. Its v - t graph is

What is the vertical displacement of a body when it is projected at an angle with the horizontal?

Maximum
zero
Infinity
Minimum

A car runs at a constant speed on a circular track of radius 100 m, taking 62.8 seconds for every circular lap. The average velocity and average speed for each circular lap respectively is

10m\s,0
0,0
0,10m/s
10m/s,10m/s

The expression for horizontal range when a body is projected at an angle with the horizontal is R =

\(\frac{u\sin\theta}{g}\)
\(\frac{u^2\sin\theta}{g}\)
\(\frac{u^2\sin\theta}{2g}\)
\(\frac{u^2\sin^2\theta}{2g}\)

An object falling freely under gravity close to earth is

one dimensional
circular motion
rotational motion
spinning motion

A stone projected vertically upwards with a speed of 15 ms^-1 from the top of a tower strikes the base of the tower in 5s. The height of the tower is (g = 10 ms^-2)

20m
45m
50m
35m

Radial acceleration is:

\(v\omega^2\)
\(r\omega\)
\(r^2\omega\)
\(r\omega^2\)

A particle moves a distance x in time t according to equation x = (I +5)^-1. The acceleration of particle is proportional to

(velocity)^3\2
(distance)²
(distance)^-2
(velocity)^2/3

If \(\bar A\)and \(\bar B\) are two vectors which of the statement is wrong?

\(\bar A+\bar B=\bar B+\bar A\)
\(\bar A-\bar B=-(\bar B+\bar A)\)
\(\bar A\times\bar B=\bar B\times\bar A\)
\(\bar A.\bar B=\bar B.\bar A\)

The unit vector along the negative z-axis is:

\(-\hat k\)
\(-\hat j\)
\(-\hat i\)
\(+\hat k\)

A car moves from X to Y with a uniform speed V_n and returns to Y with a uniform speed V_dThe average speed for this round trip is

\(\sqrt{V_uV_d}\)
\(\frac{V_uV_d}{V_d+V_u}\)
\(\frac{V_u+V_d}{2}\)
\(\frac{2V_dV_u}{V_d+V_u}\)

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