Archives

Two substances of densities ρ1 and ρ2 are mixed in equal volume and the relative density of mixture is 4. When they are mixed in equal masses, the relative density of the mixture is 3. The value of ρ1 and ρ2 are: A. ρ1=6;ρ2=2 B. ρ1=3;ρ2=5 C. ρ1=12;ρ2=4 D. None of these

Answer: A. ρ1=6;ρ2=2 Explanation: When the substances are mixed in equal volume, then the density will be: (ρ1+ρ2)/2 = 4 ρ1 +... View Article

Which scheme for animal protection was launched in 1973? A. Project Deer B. Project Chital C. Project Tiger D. None of these

Answer: C. Project Tiger... View Article

Which of the following relation is not correct? A. Equivalent conductivity: Scm^2eq^−1 B. Conductance: ohm^−1 C. Specific conductance: S cm D. Cell constant: cm^−1

Answer: C. Specific conductance: S cm... View Article

The surface tension of which of the following liquid is maximum: A. C2H5OH B. CH3OH C. H2O D. C6H6

Answer: C. H2O... View Article

A photosynthetic organism which does not release oxygen is: A. Blue-green alga B. Green sulphur bacterium C. Green alga D. Algal component of lichen.

Answer: B. Green sulphur bacterium... View Article

Which of the following is solid? A. Fluorine B. Bromine C. Iodine D. Chlorine

Answer: C. Iodine... View Article

There are exactly two points on the ellipse x^2/(a^2)+y^2/(b^2)=1 whose distance from its centre is same and equal to (1/sqrt2)(sqrt(a^2+2b^2)). The eccentricity of the ellipse is: A. 1/2 B. 1/√2 C. 3√2 D.1/3√2

Answer: B. 1/√2 As per the given condition, a = √[(a2 +2b2)/√2] Squareing both the sides we get; a2 = 2b2 b2/a2... View Article

Five bells begin to toll together and toll respectively at intervals of 6, 5, 7, 10 and 12 seconds. How many times will they toll together in one hour excluding the one at the start ? A. 7 times B. 8 times C. 9 times D. 11 times

To toll together we need to take the LCM of each seconds of bell. L.C.M. of 6, 5, 7, 10 and 12 = 420. 420/60 = 7 minutes So, the bells will... View Article

The coagulation of 200 mL of a positive colloid took place when 0.73 g HCl was added to it without changing the volume much. The flocculation value of HCl for the colloid is: A: 100 B: 36.5 C: 0.365 D: 150

200mL of the solution requires 0.73gHCl Moles of HCl = 0.73/36.5 mol = 0.02mol or 20.0m mol Hence, 1L or 1000 mL of the solution will require =... View Article

Calculate oxidation number of central atom in FeCO5.

( Charge onFe) +5(Charge on CO)=0 ( Charge on Fe) +5(0)=0 ( Charge on Fe)=0 Hence, the oxidation number of Fe inFe(CO)5 is 0.... View Article

One who does not care for literature or art: A. Barbarian B. Philistine C. Illiterate D. Primitive

Answer: B. Philistine... View Article

Two organisms live in close association with each other such as one is benefited and the other is neither benefited nor harmed. Which of the following terms best describes this relationship? A. parasitism B. mutualism C. tautomerism D. commensalism

Answer: D. commensalism... View Article

The maximum peak-to-peak voltage of an AM wave is 16mV, and the minimum peak-to-peak voltage is 4mV. The modulation factor is equal to A. 0.6 B. 0.3 C. 0.8 D. 0.25

Answer: A. 0.6 Maximum voltage, Emax = 16/2 = 8mV Minimum voltage, Emin = 4/2 = 2mV Modulation factor, μ = (Emax - Emin)/(Emax +... View Article

A transformer is employed to: A. obtain a suitable dc voltage B. convert dc into ac C. obtain a suitable ac voltage D. convert ac into dc

Answer: C. obtain a suitable ac voltage... View Article

A red LED emits light at 0.1Watt uniformly around it. The amplitude of the electric field of the light at a distance of 1m from the diode is: A. 6V/m B. 2.45V/m C. 5.48V/m D. 1.73V/m

Answer: B. 2.45V/m Explanation: Intensity of light, I = P/4πr2 = uav×c uav = 1/2 ∈0E02 = 2.45 V/m ... View Article

There is no life on moon because of the absence of: A. Water B. Oxygen C. Nitrogen D. Hydrogen

Answer: A. Water... View Article

Explain how a square is a parallelogram.

A square has its opposite sides equal and parallel, so, it is a parallelogram.... View Article

M	T	W	T	F	S	S
						1
2	3	4	5	6	7	8
9	10	11	12	13	14	15
16	17	18	19	20	21	22
23	24	25	26	27	28	29
30	31