Recent questions in CBSE XI

What is weight of NaOH present in 250 cc of a 2M Solution ?

asked Feb 2, 2022 by meena.clay6

1 answer

Acceleration of a particle changes when

asked Aug 21, 2019 by meena.clay6

1 answer

A ball is thrown vertically upwards from top of tower at $4.9\;m/s$ . It strikes the base of the tower after 3 seconds. The height of tower .

asked Aug 21, 2019 by meena.clay6

2 answers

A particle has velocity $v= 2\hat r+4 \hat j$ and acceleration $\overrightarrow{a}=0.1 \hat{i}+0.4 \hat j$ Find the speed after 10 seconds

asked Aug 20, 2019 by meena.clay6

1 answer

A particle starts with constant acceleration At a time t s speed is found to be 100 m/s and one second later speed becomes 150 m/s. Find the acceleration

asked Aug 20, 2019 by meena.clay6

1 answer

If the velocity of a particle is given by $v= (180-15x)^{1/2}$ . Then its acceleration will be

asked Aug 20, 2019 by meena.clay6

1 answer

The velocity of bullet is reduced from 200 m/s to 100 m/s. While travelling through a wooden block, of thickness 10m.what is the retordation.

asked Aug 20, 2019 by meena.clay6

1 answer

A body starts from rest. What is the ratio of the distance travelled by the body during fourth and 2nd second

asked Aug 19, 2019 by meena.clay6

1 answer

A particle has speed $6.25 m/s$ is decelerated at sale of given by $\large\frac{dv}{dt}$ $=-2.5 \sqrt {v}$ where v is instantaneous speed. The time taken for the object to come to real is

asked Aug 19, 2019 by meena.clay6

1 answer

A stone is shot upwards with a speed of 20 m/s from a tower $200\;m$ high . The speed with which the stone strikes the ground is approximately .

asked Aug 19, 2019 by meena.clay6

2 answers

The motion of a particle is described by equation $x= a+bt^2$ where $a=15\;cm,b=3\;cm/s$ The instantaneous velocity at time 3 will be

asked Aug 19, 2019 by meena.clay6

1 answer

A 210 m long train is moving north at a speed of $25\;m/s$ . A small bird is flying south a little above the train with speed of $5m/s$ . The time after which the bird crosses the train is :

asked Aug 19, 2019 by meena.clay6

1 answer

A body A is projected upward with velocity 98m/s. The second body B is projected with same initial velocity after 4 seconds . Both bodies will meet after

asked Jul 29, 2019 by meena.clay6

0 answers

Consider the motion of the tip of the minute hand of a clock. In one hour

asked Jul 29, 2019 by meena.clay6

1 answer

A body starts from road. What is the ratio of the distance travelled by the body during 4th and 3rd second

asked Jul 29, 2019 by meena.clay6

1 answer

One car is moving on a straight road covers one third of the distance with $20\;km/hr$ and rest with $60\;km/hr$ . The average speed

asked Jul 29, 2019 by meena.clay6

1 answer

Water drops fall at regular interval from tap which is 5 m above the ground . The third drop is leaving the tap at the instant first drop touches the ground . How far above the ground is the second drop at that instant.

asked Jul 25, 2019 by meena.clay6

1 answer

A boy walks to his school at a distance of 6 km with constant speed of 2.5 km/hr and walks both with a constant speed of 4 km/hr . His average speaks for the round trip is

asked Jul 25, 2019 by meena.clay6

1 answer

Two trains each 50 m long are travelling in opposite direction with velocity 10 m/s and 15 m/s. The time of crossing is

asked Jul 25, 2019 by meena.clay6

1 answer

A stone is thrown vertically upwards with a velocity $98 m/s$ Its velocity will be zero after

asked Jul 25, 2019 by meena.clay6

1 answer

A particle starts from rest with constant acceleration $2m/s^2$ . Find the displacement in 5th sec

asked Jul 25, 2019 by meena.clay6

1 answer

Two bodies of different masses say 1 kg and 5 kg are dropped simultaneously a tower. They will reach the ground

asked Jul 25, 2019 by meena.clay6

1 answer

A car moving along a straight highway with speed $126\;km/hr$ is brought to a stop with in a distance of 200 m . ?What is the retardation of the car, and how long does it take for the car to stop .

asked Jul 25, 2019 by meena.clay6

1 answer

A planet is at a distance of $8.427 \times 10^8 \;km$ from earth. Its angular diameter $=35.72''$ of an arc. Calculate diameter of planet.

asked Jul 25, 2019 by meena.clay6

1 answer

If Area(A) , velocity(V) and density $(\rho)$ are base units , then dimensional formula of force

asked Jul 25, 2019 by meena.clay6

1 answer

The percentage error in measuring radius of a sphere is found to be $0.05\%$ calculate the percentage of error is measuring its volume

asked Jul 25, 2019 by meena.clay6

1 answer

Magnification of a microscope is 150. A person find the average width of a thread to be 3 mm . what is estimate of thickness of thread

asked Jul 24, 2019 by meena.clay6

1 answer

Find density of lead if its relative density = 11.3

asked Jul 24, 2019 by meena.clay6

1 answer

convert 1kg $m^2\;s^{-2}$ into = ______ $g cm^{-2}S^{-2}$

asked Jul 23, 2019 by meena.clay6

1 answer

Find the distance between Quasar (the most distance objects from earth) in km if light takes 3.0 billion year h reach us

asked Jul 23, 2019 by meena.clay6

1 answer

Error in measurement of length is found to be $0.2\%$ what is the error in meaning the volume of a cube .

asked Jul 23, 2019 by meena.clay6

1 answer