Recent questions and answers in CBSE XI

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

answered Feb 2, 2022 by meena.clay6

1 answer

Prove the following statement by the principle of mathematical induction : \[\] $1+5+9+...+(4n-3)=n(2n-1)$ for all natural numbers $n$.

answered Feb 3, 2021 by abdulrahimshafiuyusuf

1 answer

Choose the correct answer for all $n \in N, 3.5^{2n+1}+2^{3n+1}$ is divisible by

answered Sep 25, 2020 by apoorva14544

1 answer

State the three steps of sexual cycle in fungi.

answered Jun 28, 2020 by kphasnashirin

2 answers

Discuss how classification systems have undergone several changes over a period of time. Since the dawn of civilization, many attempts have been made to classify organisms.

answered Jun 28, 2020 by kphasnashirin

2 answers

Describe briefly the four major groups of protozoa. The four groups of Protozoa are classified based on their locomotory organs.

answered Jun 28, 2020 by kphasnashirin

2 answers

What is relative mass and charge of an electron?

answered Feb 17, 2020 by dashsourav53

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 .

answered Jan 8, 2020 by aniket.mankar001

2 answers

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 .

answered Jan 8, 2020 by aniket.mankar001

2 answers

Acceleration of a particle changes when

answered Aug 21, 2019 by meena.clay6

1 answer

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

answered 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

answered 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

answered 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.

answered 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

answered 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

answered Aug 19, 2019 by meena.clay6

1 answer

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

answered 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 :

answered Aug 19, 2019 by meena.clay6

1 answer

If $P(n) : 2n < n!, n \in N$, then $P(n)$ is true for all $n \geq $______ .

answered Aug 14, 2019 by s9466813326

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

answered 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

answered Jul 29, 2019 by meena.clay6

1 answer