List of practice Questions

$MnO_2 + HCl { ->[\Delta] } A(g)$ $ A(g)+ F_{2 {\text{(excess)}}}->[573 \, K] B(g)$ $B(l)+ U(s)\rightarrow C(g)+D(g)$ The gases $A, B, C$ and $D$ are respectively

Which of the following is the largest taxon among plants in terms of the number of species ?

Which of the following statements is correct for the spontaneous adsorption of a gas?

The time period of a particle undergoing SHM is 16 s. It starts motion from the mean position. After 2 s, its velocity is 0.4 m s. The amplitude is

Which one of the following species has plane triangular shape?

A stone is dropped into a quiet lake and waves move in circles at the speed of $5\, cm/sec$. At that instant, when the radius of circular wave is $8 \,cm$, how fast is the enclosed area increasing ?

The standard deviation of $9, 16, 23, 30, 37, 44, 51$ is

Which of the following names does not fit a real name?

Select the correct option -

The force $F$ acting on a particle of mass $m$ is indicated by the force-time graph shown below. The change in momentum of the particle over the time interval from zero to $8\,s$ is

Transformation was discovered by

What is the value of shunt resistance required to convert a galvanometer of resistance $100$ $\Omega$ into an ammeter of range $1\,A$ ? Given : Full scale deflection of the galvanometer is $5 \,mA$

If $A$ is $3 \times 4$ matrix and $B$ is a matrix such that $A'B$ and $BA'$ are both defined. Then $B$ is of the type

The angle between two diagonals of a cube is

The statement that is NOT correct is

$ {X ->[{\text{Ozonolysis}}][{\text{(Reductive)}}] Y + Z}$ $Y$ can be obtained by Etard's reaction, $Z$ undergoes disproportionation reaction with concentrated alkali. $X$ could be

What is a period of revolution of earth satellite ? Ignore the height of satellite above the surface of earth. Given : (1) The value of gravitational acceleration $g= 10\,ms^{-2}$ (2) Radius of earth $R_E = 6400\, km$. Take $\pi = 3.14$

In a triangle $ABC, a[b \,cos \,C - c\, cos\, B]$ =

In anomalous expansion of water, at what temperature, the density of water is maximum ?

Match the following and select the correct answer. (A) Centriole - (i) lnfoldings in mitochondria (B) Chlorophyll - (ii) Thylakoids (C) Cristae - (iii) Nucleic acids (D) Ribozymes - (iv) Basal body of cilia or flagella

A 4 metre long ladder weighing 25 kg rests with its upper end against a smooth wall and lower end on rough ground. What should be the minimum coefficient of friction between the ground and the ladder for it to be inclined at 60? with the horizontal without slipping ? (Take $g = {10 \,m \,s^{-2}}$)

Which one of the following fungi contains hallucinogens?

Which of the following shows coiled RNA strand and capsomeres?

Viruses have

Which one of the following living organisms completely lacks a cell wall?