List of practice Questions

An element crystallises in a b.c.c. lattice. Nearest and next nearest neighbours are respectively
The maximum value of sin θ\theta cos θ\theta is
The mass of moon is 1% o f mass of earth. The ratio of gravitational pull of earth on moon and that of moon on earth will be
Two matrices A and B are multiplicative inverse of each other only if
If (a, b), (c, d) and (a - c, b - d) are collinear, then which one of the following is correct ?
If at 298 K the bond energies of C-H, C-C, C = C and H-H bonds are respectively 414, 347, 615 and 435 kJ mol−1mol^{-1} the value of enthalpy change for the reaction.H2C=CH2(g)+H2(g)−−−−−>H3C−CH3(g)H_2C = CH_2(g) + H_2(g) -----> H_3C-CH_3(g) at 298 K will be
Identified A, B, C and D.

Six vectors, a⃗\vec{a} through f⃗\vec{f} have the magnitudes and directions indicated in the figure. Which of the following statements is true?

In two different systems of units, acceleration is represented by the same number while a velocity is represented by numbers in the ratio 1:31 : 3. The ratios of unit of length and time are, respectively,
The control rods used in a nuclear reactor can be made up of
Consider the following statement: "The mean of a binomial distribution is 3 and variance is 4." Which of the following is correct regarding this statement?
Quantisation of charge implies

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A) : For extraction of Iron haematite ore is used. 

Reason (R) : Because haematite is carbonate ore.

In the light of the above statements, choose the correct answer from the options given below

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A) : H-S-H bond angle in H2_2S is closer to 90∘^{\circ} but H-0-H bond angle in H2O_2O is 104.5∘^{\circ}. 

Reason (R) : lp−lplp-lp repulsion is stronger in H2SH_2S than in H2O_2O.

In the light of the above statements, choose the correct answer from the options given below

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A): London smog is oxidising in nature. 

Reason (R): London smog contains O3_3, NO2_2 and hydrocarbons.

In the light of the above statements, choose the correct answer from the options given below

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A): On cooling, ammonia liquifies first whereas CO2CO_{2} requires more cooling. 

Reason (R): Critical temperatures of ammonia and carbon dioxide are 405.5K405.5 K and 304.10K304.10 K respectively.

In the light of the above statements, choose the correct answer from the options given below

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A): Propagation of light through an optical fibre is due to total internal reflection taking place at the core-cladding interface 

Reason (R) : Refractive index of the material of the core of the optical fibre is greater than that of air.

In the light of the above statements, choose the correct answer from the options given below

Nissl's granules are found in cyton of nerve cells. These have affinity for basic dyes. The granules are made up of

Study the given figure of respiratory passage carefully and identify the parts labelled as AA, BB, CC, DD and EE.
Choose the wrong statement:
Which of the following have identical bond order? (I) CN−CN^-\quad (II) O2−O_2 ^- \quad(III) NO+NO^+\quad (IV) CN+CN^+
If x>1,y>1,z>1x > 1, y > 1, z > 1 are in G.P.G.P. then 11+log x,11+log y,11+log z\frac{1}{1+log\,x}, \frac{1}{1+log\,y}, \frac{1}{1+log\,z} are in :
lim⁡x→π482−(cos⁡x+sin⁡x)72−2sin⁡2x\displaystyle\lim _{x \rightarrow \frac{\pi}{4}} \frac{8 \sqrt{2}-(\cos x+\sin x)^7}{\sqrt{2}-\sqrt{2} \sin 2 x} is equal to
The correct order of energy of absorption for the following metal complexes is A:[Ni(en)3]2+A :\left[ Ni ( en )_3\right]^{2+}, B:[Ni(NH3)6]2+ B :\left[ Ni \left( NH _3\right)_6\right]^{2+}, C:[Ni(H2O)6]2+C :\left[ Ni \left( H _2 O \right)_6\right]^{2+}
a+ib<c+ida + ib < c + id is meaningful only when