Recent questions and answers

The molecular geometry of SF6 is octahedral. What is the geometry of SF4 (including lone pair(s) of electrons, if (any)? (1) Square planar (2) Trigonal bipyramidal (3) Tetrahedral (4) Pyramidal

A curve y = ax2 + bx + c passing through the point (1, 2) has slope at origin equal to 1. then ordered triplet (a, b, c) may be (1) (1, 1, 0) (2) ($1\over2$, 1, 0) (3) (−$1\over2$, 1, 1) (4) (2, −1, 0)

A aeroplane is flying horizontally with speed of 432 km/hr at height h meter from ground. Its angle of elevation from a point on ground is 60°. After 20 sec its angle of elevation from same point is 30° then the height 'h' is equal to (1) $1200\sqrt3$ (2) ...

The area of the region defined by $5x^2\leq y\leq 2x^2+9$ is (1) $6\sqrt3$ (2) $12\sqrt3$ (3) $18\sqrt3$ (4) $9\sqrt3$

A curve y = f(x) passing through the point (1,2) satisfies the differential equation $x{dy\over dx}+y=bx^4$ such that $\int\limits_1^2f(y)dy={62\over5}$. The value of b is (1) 10 (2) 11 (3) $32\over5$ (4) $62\over5$

Given f(0) = 1, f(2) = e2 also f'(x) = f'(2 – x), then the value of $\int\limits_0^2$ f(x)dx is (1) 1 – e2 (2) 1 + e2 (3) e (4) e2

The separation of two chromatids of each chromosome at early anaphase is initiated by (a) the interaction of centromere with the chromosomal fibres (b) the elongation of metaphasic spindle (c) the force of repulsion between the divided kinetochores (d) all ...

If A and B are subset s of X = {1, 2, 3, 4, 5} then find the probability such that n(A $\cap$ B) = 2. (1) $65\over2^7$ (2) $65\over2^9$ (3) $35\over2^9$ (4) $135\over2^9$

Find the value of n+1C2 + 2(2C2 + 3C2 + …… + nC2) = ? (1) $n(n+1)(2n-1)\over6$ (2) $n(n+1)(2n+1)\over6$ (3) $(n-1)n(n+1)\over6$ (4) $n(n+1)\over2$

Mass of Li3+ is 8.33 times mass of proton Li3+ and proton are accelerated through same potential difference. Then ratio of Debroglie's wavelength of Li3+ to proton is x × 10–1. Find x Numerical Value Type

4.5 gm of solute having molar mass of 90 gm/mol is dissolved in water to make 250 ml solution. Calculate molarity of the solution Numerical Value Type

Among the following compounds how many are amphoteric in nature Be(OH)2, BeO, Ba(OH)2, Sr(OH)2 Numerical Value Type

What is the coordination number in Body centred cubic (BCC) arrangement of identical particles Numerical Value Type

Composition of gun metal is (1) Cu, Zn, Sn (2) Al, Mg, Mn, Cu (3) Cu, Ni, Fe (4) Cu, Sn, Fe

(1) $\require{mhchem}\ce{I2 +H2O2 +2OH- -> 2I- +2H2O +O2}$ (2) $\ce{H2O2 +HOCl->Cl- +H3O+ +O2}$ (1) H2O2 is acting as oxidising agent in both the reaction (2) H2O2 is acting as reducing agent in both the reaction (3) H2O2 is acting as oxidising agent in ...

S-1: Colourless cupric metaborate is converted into cuprous metaborate in luminous flame. S-2: Cuprous metaborate is formed by reacting copper sulphate with boric anhydride heated in non luminous flame. (1) S1 is true and S2 is false (2) S1 is false and S2 ...

Which of the following ores are concentrated by cyanide of group Ist element. (1) Sphalerite (2) Malachite (3) Calamine (4) Siderite

Which of the following have both the compound isostructural. (A) TiCl4, SiCl4 (B) SO42-, CrO42- (C) NH3, NO3– (D) ClF3, BCl3 (1) A,B (2) A,C (3) B,C (4) A,D

The gas evolved due to anaerobic degradation of vegetation causes? (1) Global warming and caner (2) Acid rain (3) Ozone hole (4) Metal corrosion

Which force is responsible for the stacking of $\alpha$-helix structure of protein? (1) H-bonding (2) Ionic bonding (3) Covalent bond (4) Vander Wal forces

The correct order of steps in Polymerase Chain Reaction (PCR) is : (1) Denaturation, Extension, Annealing (2) Annealing, Extension, Denaturation (3) Extension, Denaturation, Annealing (4) Denaturation, Annealing, Extension

A charged particle (mass m and charge q) moves along X axis with velocity V0. When it passes through the origin it enters a region having uniform electric field $\vec{E}=-E\hat{j}$ which extends upto x = d. Equation of path of electron in the region x > d ...

Let $f(x)={4x^3-3x^2\over6}-2\sin x+(2x-1)\cos x$ then $f(x)$ (1) decreases in $\left[{1\over2},\ \infty\right)$ (2) increases in $\left[{1\over2},\ \infty\right)$ (3) decreases in $(-\infty,\ \infty)$ (4) increases in $\left(-\infty,\ {1\over2}\right]$

Tangent at point P(t, t3) of curve y = x3 meets the curve again at Q then ordinate of point which divides PQ in 1 : 2 internally, is (1) 0 (2) 2t3 (3) –2t3 (4) 8t

Two towers are 150m distance apart. Height of one tower is thrice the other tower. The angle of elevation of top of tower from midpoint of their feets are complement to each other then the height of smaller tower is (1) $25\sqrt3$ m (2) $25\over\sqrt3$ m (3...

The value of (–15C1 + 2.15C2 – 3.15C3 + ....... –15.15C15) + (14C1 + 14C3 + .......... + 14C11) is (1) 216 – 14 (2) 213 – 14 (3) 213 – 13 (4) 214

Which of following is tautology ? (1) $A\land(A\to B)\to B$ (2) $B\to(A\land A\to B)$ (3) $A\land (A\lor B)$ (4) $(A\lor B)\land A$

Population of a town at time t is given by the differential equation ${dP(t)\over dt}=(0.5)\ P(t)-450$. Also P(0) = 850 find the time when population of town becomes zero. (1) $\ln9$ (2) $3\ln4$ (3) $2\ln18$ (4) $\ln18$

A fair die is thrown n times. The probability of getting an odd number twice is equal to that getting an even number thrice. The probability of getting an odd number, odd number of times is (1) $1\over3$ (2) $1\over6$ (3) $1\over2$ (4) $1\over8$

There are two positive number p and q such that p + q = 2 and p4 + q4 = 272. Find the quadratic equation whose roots are p and q. (1) x2 – 2x + 2 = 0 (2) x2 – 2x + 135 = 0 (3) x2 – 2x + 16 = 0 (4) x2 – 2x + 130 = 0