Archives

The C.I. on a sum of money for 2 years is Rs. 832 and the S.I. on the same sum for the same period is Rs. 800. The difference between the C.I and S.I. for 3 years will be

Given that, The simple interest for 2 years = 800. Hence, S.I for 1st year = Rs. 400 and S.I for 2nd year = Rs. 400. So, Compound interest... View Article

The sides of a triangle are 150 cm, 100 cm and 200 cm. find the area of the triangle.

The sides of a triangle are 150 cm, 100 cm and 200 cm respectively. If three sides are given, then the area of a triangle can be calculated... View Article

The angle of elevation of the top of a tower from a point on the ground, which is 64 m away from the foot of the tower is 45°. The height of the tower is

Let the height of the tower be “h” Now, consider the triangle ABC, tan 45° = Opposite side/Adjacent side tan 45° = AC/BC tan 45° = h/64 1... View Article

For what value of k do the equations 5x-2y+8=0& 15x+ky=-24

Given equations: 5x - 2y + 8 = 0 15x + ky+24 = 0 The equations are of a1x + b1y + c1 = 0 and a2x + b2y + c2 = 0 Here, a1 = 5, b1 = -2, c1 = 8... View Article

The angle between the curves y=2x and x^3+y^3=3xy at the point other than origin is

Given two curves are: y = 2x …(1) x3 + y3 = 3xy …(2) On solving the two equations, we get (x, y) = (⅔, 4/3) [Other than... View Article

The correct order of acidic strength of HOCl, HClO2, HClO3 and HClO4 are:

(A) HOCl > HClO2 > HClO3 > HClO4 (B) HOCl4 > HClO3 > HClO2 > HClO (C) HOCl3 > HClO4 > HClO2 > HClO (D) HOCl3... View Article

Assertion: Racemic mixture is optically inactive. Reason: Racemic mixture is a mixture of meso compounds.

(A) Both Assertion and Reason are false. (B) Assertion is true, but Reason is false. (C) Both Assertion and Reason are true. The reason is... View Article

The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase?

(A) Ar < K+ < Ca2+. (B) Ca2+ < K+ < Ar. (C) K+ < Ar < Ca2+. (D) Ca2+ < Ar < K+. The Correct Answer is(B) Ca2+ < K+... View Article

Which one of the following characteristics is not correct for physical adsorption?

(A) Adsorption is spontaneous (B) Adsorption increases with the increase in temperature (C) Both enthalpy and entropy of adsorption (D)... View Article

In a hypothetical Bohr hydrogen atom, the mass of the electron is doubled. The energy E0 and the radius r0 of the first orbit will be (r0 is the Bohr radius)

(A) -6.8 eV (B) -11.2 eV (C) -27.2 eV (D) -33.6 eV The Correct Answer is (C) -27.2 eV Solution: As: Therefore, As: Therefore,... View Article

The 71st electron of an element X with an atomic number of 71 enters into the orbital:

(A) 4s (B) 5s (C) 5d (D) 6s The Correct Answer is (C) 5d Solution: The electronic configuration of element X with atomic number 71 is... View Article

For emission line of atomic hydrogen from ni=8 to nf- the plot of wavenumber (v) against (1/n2) will be:(The Rydberg constant, RH is in wave number unit).

(A) Non-linear (B) Linear with slope RH (C) Linear with slope - RH (D) Linear with intercept- RH The Correct Answer is (B) Linear with slope... View Article

Assertion: The ease of dehydration of alcohols follows the order: Primary > Secondary > Tertiary. Reason: Dehydration proceeds through the formation of oxonium ions.

(A) Both Assertion and Reason are false.< (B) Assertion is true, but Reason is false. (C) Both Assertion and Reason are true. The reason... View Article

Two liquids (P) and (Q) can be separated by the method of fractional distillation. The boiling points of P and Q are _ and ___ respectively.

(A) 329 K and 332 K (B) 329 K and 354 K (C) 329 K and 373 K (D) 329 K and 473 K The Correct Answer is (A) 329 K and 332 K. Solution:... View Article

Which one of the following schemes of ordering closed packed sheets of equal-sized spheres do not generate close-packed lattice?

(A) ABCABC (B) ABBAABBA (C) ABACABAC (D) ABCBCACBC The Correct Answer is (B) ABBAABBA Solution: The scheme ABBAABBA of ordering... View Article

Which of the following series of transitions in the spectrum of hydrogen atoms fall in the visible region?

(A) Lyman series (B) Brackett series (C) Balmer series (D) Paschen series The Correct Answer is (C) Balmer series. Solution: In the... View Article

Which of the following arrangements does not represent the correct order of property stated against it?

(A) Sc < Ti < Cr < Mn: Number of oxidation states (B) Ni2+ < Co2+ < Fe2+ < Mn2+: Ionic size (C) V2+ < Cr3+ < Mn2+ <... View Article

For an exothermic chemical process occurring in two steps as (i) A+B→X (Slow) and (ii) X→AB (Fast). The progress of the reaction can be best described by:

The Correct Answer is (B) Explore more such questions and answers at BYJU'S.... View Article

The mass percentage of urea in an aqueous solution is 30%. The molality of urea in the solution is:

(A) 4.5 m (B) 5.2 m (C) 6.1 m (D) 7.1 m The Correct Answer is (D) 7.1 m. Solution: Molality = Weight of Water = 100 - 30 = 70 g... View Article

H2S, toxic gas with a rotten egg-like smell, is used for the qualitative analysis. If the solubility of H2S in water at STP is 0.195 m. Calculate Henry’s law constant.

(A) 213.8 bar (B) 282.0 bar (C) 345.8 bar (D) 462.9 bar The Correct Answer is (B) 282.0 bar Solution: 1kg of solvent contains . Mole... View Article