Question 1 :
A $120 m$ long train is moving towards west at a speed of $5 {m}/{sec}$ crosses the train. The time taken by the bird to cross the train would be
Question 2 :
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 negative
Question 4 :
If radius of the were to shrink by $1\% ,$ It's mass remain same the the value of g on the earth surface would
Question 5 :
A truck moves along a straight highway track. It covers first $2 km$ distance in $10 min$, next $4 km$ in $20 min$ and final $6 km$ in $30 min$. Then, its motion is an example of :
Question 6 :
A person wants to drive on the vertical surface of a large cylindrical wooden 'well' commonly known as'death well' in a circus. The radius of the well is 2meter, and the coefficient of friction between the tyres of the motorcycle and the wall of the well is $0.2 ,$ theminimum speed the motorcyclist must have in orderto prevent slipping should be
Question 7 :
A particle is moving towards East velocity $V$ after some time it is moving with velocity $2 V$ towards North. What is magnitude of change in velocity?
Question 8 :
Source and observer start moving simultaneously along x and y-axis respectively. The speed of source is twice the speed of observer, $V_0$.If the ratio of observed frequency to frequency of the source is $0.75$, find the velocity of sound
Question 9 :
A bomber plane moving horizontally with a speed of $720 \ km /hour$, releases a bomb. The bomb strikes the ground in $10 \ s$. What is the angle at which the bomb strikes the ground? $(g = 10 m/s^2)$
Question 10 :
A source of sound is travelling with a velocity 40 km/hr towards an observer and emits sound of frequency 2000 Hz. If velocity of sound is 1220 km/hr, then what is the apparent frequency heard by an observer?
Question 11 :
A car moving along a straight road with speed of 144 km $h^{-1}$ is brought to a stop within a distance of 200 m. How long does it take for the car to stop?
Question 12 :
Whenever an object moves with a constant speed, its distance - time graph is a
Question 13 :
A car travels first $60 km$ of a distance in $1 hr$, next $70 km$ of the distance in next hour and remaining $20 km$ distance in final hour. Then, its motion is:
Question 16 :
If $y$ co-ordenate of a particle moving in $x-y$ plane is given as $ y=\sqrt { 60-{ 9x }^{ 2 }m/s }$ then graph between $y$ and $x$ is
Question 17 :
Two trains of length $500\, m$ and $1000\,m$ moving in opposite direction with same speed crosses each other in $10\, sec$, find their speed :
Question 18 :
Motion of a body falling freely under gravity is an example of
Question 19 :
A train of length 50 m is moving with a constant speed of 10 m/s.Calculate the time taken by the train to cross an electric pole and a bridge of length 250 m.
Question 20 :
Two heaters designed for the same voltage V have different power rating. When connected individually across a source of voltage V, they produce H amount of heat each in time $t_1$ and $t_2$ respectively. When used together across the same source, they produce H amount of heat in time t
Question 21 :
Which of the following graphs should be used to represent the percentage of boys and girls in a class?
Question 22 :
A stone is projected vertically upward from the top of a tower with a velocity $u$ and strikes the bottom of the tower with a velocity $3u$. The distance travelled by stone is
Question 23 :
For a simple pendulum, relation between time period $T$, length of pendulum $l$ and acceleration due to gravity $g$ is given by :
Question 25 :
A body starts from rest and with a uniform acceleration of $10 ms^{-2}$ for 5 seconds. During the next 10 seconds it moves with uniform velocity. The total distance travelled by the body is :-
Question 26 :
A person has two hourglass, one of 30 seconds and other of 1 minute. Which of the following time intervalscan he not measure?
Question 27 :
A particle $P$is a moving in a circle of radius e with a uniform speed $v.C$ is the centre of the circle, and $AB$is a diameter, If $P$is at $B$, the angular velocities of $P$about $A$and $C$are in the ratio
Question 28 :
A stone is thrown vertically upwards. On its way, passes a point P with a speed $v$ and point Q is $20 m$ higher than Q with a speed $\cfrac{\sqrt{5}}{3}v$. The value of speed: [$g = 10 m/s^2$]
Question 29 :
Assertion: Position-time graph of a stationary object is a straight line parallel to time axis.
Reason: For a stationary object, position does not change with time.
Question 30 :
An object with a mass of $10kg$ moves at a constant velocity of $10m/s$. A constant force then acts for $4 sec$ on the object and gives it a speed of $2m/sec$ in opposite direction. The acceleration produced in it is,<br/>
Question 32 :
State whether true or false :<br>The pendulum is said to be in mean position or stable equilibrium when the centre of mass of the bob lies directly below the the point of suspension.
Question 33 :
In a rocket of mass $1000kg$ fuel is consumed at a rate of $40kg/s.$ The velocity of the gases ejected from the rocket is $5000m/s.$ the thrust on the rocket is
Question 34 :
A tourist being chased by an energy bear is running in a straight line towards his car at a speed of $4.0 \ m/s$. The car is a distance $d$ away. The bear is $26 \ m$ behind the tourist and running at $6.0 \ m/s$. The tourist reaches the car safely the maximum possible value for $d$ is:-<br>
Question 35 :
Assertion: The $V\rightarrow t$ graph perpendicular to time axis is not possible in practice.
Reason: Infinite acceleration can not be realized in practice.
Question 36 :
A particle is moving with velocity 5m/s<b> </b>towards the east and its velocity changes to 5m/s north in 10sec.<b></b> Find the acceleration.
Question 37 :
A mass m rotates in a vertical circle of radius R and has a circular speed $v_{c}$ at the top . If the radius of the circle is increased by a factor of 4, circular speed at the top will be
Question 38 : <p>A body travels $200cm$ in the first two seconds and<b> $220cm$</b>in the next 4 seconds.<b> </b> The velocity at the end Of the eleventh second is </p>
Question 39 :
The position of a particle varies according to expression $x = t\left( {t - 1} \right)\left( {t - 2} \right)$, velocity of the particle is zero at times.<br>
Question 40 :
The time period and frequency of a second's pendulum is :
Question 41 :
A shell of mass 10 kg is moving with a velocity of $\displaystyle 10{ ms }^{ -1 }$ when it blasts and forms two parts of mass 9 kg and 1 kg respectively. If the 1st mass is stationary, the velocity of the 2nd is:
Question 42 :
A car moves on a circular road describing equal anglesabout the centre in equal intervals of time. Which of following statements about the velocity of car are not true?
Question 43 : <p>Two bodies are thrown simultaneously from a tower with same initial velocity${v_0}$ one vertically upwards, the other vertically downwards. The distance between the two bodies after time<b> t</b> is.</p>
Question 44 :
A speed of 90 km $h^{-1}$ is equal to _______ m $s^{-1}$.<br/>
Question 45 :
Which of the following shows a motion in a straight line?
Question 46 :
Two trains 121 m and 99 m in length are running in opposite directions with velocities 40 $km \ h^{-1}$ and 32 $km \ h^{-1}$. In what time they will completely cross each other?
Question 47 :
Assertion: The watches having hours hand, minutes hand and second hand have least count as 1 ms.
Reason: Least count is the measurement that can be measured accurately by an instrument.
Question 48 :
A car of mass m is driven with acceleration 'a' alone When the velocity of the car is V the rate at which the engine of the car is doig work will be :
Question 49 :
When a simple pendulum is taken from the Equator to the Pole, its period of oscillation will :
Question 50 :
Write the true or false for each of the statement.<br/>The speed 5 $ ms^{-1} $ is less than 25 km $ h^{-1} $.
