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What happens when a piece of silver metal is added to copper sulphate solution? (A) Silver sulphate is formed (B) Silver displaces copper sulphate (C) Oxygen gas is evolved (D) No reaction

No reaction There is no reaction when silver Ag metal is added to copper sulphate CuSO4. Since silver is less reactive than that of copper, so... View Article

Vascular tissues that transport water and minerals in plants are called as ___________ (A) Phloem (B) Xylem (C) Sclerenchyma (D) Cambium

Xylem In plants, minerals and water are transported through the xylem cells from soil to the leaves. The xylem cells of the stem, roots, and... View Article

The side faces of a pyramid are (A) Triangles (B) Squares (C) Trapeziums (D) Polygons

Triangles The side faces of a pyramid are triangles. They are also called its lateral faces Hence, the correct option is (A)... View Article

If a bimetallic strip is heated it will (A) Bend towards the metal with higher thermal expansion (B) Not bend at all (C) Twist itself into a helix (D) Bend towards the metal with lower thermal expansion

Bend towards the metal with lower thermal expansion On heating, the bimetallic strip starts bending. Bending will be higher towards the metal... View Article

Rainbow is an example for continuous spectrum. Explain

A rainbow is regarded as one of the most spectacular light shows observed on the earth. Rainbow is a multicoloured arc made due to the striking... View Article

Which among the following statements is incorrect for magnesium metal? (A) It burns in oxygen with a dazzling white flame (B) It reacts with cold water to form magnesium oxide and evolves hydrogen gas (C) It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas (D) It reacts with steam to form magnesium hydroxide and evolves hydrogen gas

It reacts with cold water to form magnesium oxide and evolves hydrogen gas Magnesium reacts with cold water to form magnesium oxide and evolves... View Article

A cable breaks if stretched by more than 2 mm. It is cut into two equal parts. How much either part can be stretched without breaking? (A) 0.25 m (B) 0.5 mm (C) 1 mm (D) 2 mm

The elongation ΔL of a metallic cable of young modulus E, cross sectional area A and length L under the tensile load P is given by ΔL... View Article

A vendor buys bananas at 3 for a rupee and sells at 4 for a rupee. Find his profit or loss percentage

Consider the number of bananas bought = 12 Here, LCM of 3 and 4 is 12 We know that C.P. of bananas = 1/3 x 12 = ₹ 4 S.P. of bananas = 1/4 x... View Article

A large steel wheel is to be fitted on to a shaft of the same material. At 27 degree C the outer diameter of the shaft is 8.70 cm and the diameter of the central hole in the wheel is 8.69 cm. The shaft is cooled using ‘dry ice’. At what temperature of the shaft does the wheel slip on the shaft? Assume coefficient of linear expansion of the steel to the constant over the required temperature range: αsteel = 1.20 x 10^-5 K^-1

Given T = 270C This can be written in Kelvin as, 27 + 273 = 300 K Outer diameter of the steel shaft at T, d1 = 8.70 cm Diameter of the... View Article

If the radius of earth shrinks by 1.5 percent (mass remaining same), then the value of gravitational acceleration changes by (A) 2% (B) -2% (C) 3% (D) -3%

According to the question, Given Decrease in the radius of the earth is 1.5% Let the test mass used in the process is m and the mass of the earth... View Article

Write the structure of the following organic halogen compound. 2 – (2 – Chlorophenyl) – 1 – iodooctane

The structure of the given organic halogen compound is shown below... View Article

Glycogen on hydrolysis gives (A) lactose and glucose (B) only glucose (C) glucose and fructose (D) glucose and maltose

Only glucose Glycogen: It is a multibranched polysaccharide of glucose that serves as a source of energy in animals.These carbohydrates are... View Article

___________ is considered as the father of Socialism

Karl Marx revolutionized and popularized the ideas of Socialism. Therefore, he is called as the father of modern socialism... View Article

A proton of energy 8 eV is moving in a circular path in a uniform magnetic field. The energy of an alpha particle moving in the same magnetic field and along the same path will be (A) 4eV (B) 2eV (C) 8eV (D) 6eV

Given Energy of a proton = 8eV Here, Momentum of a particle moving in a magnetic field mv = p = qBr Hence, Kinetic energy of that particle can be... View Article

A depleting source of energy is (A) Wind (B) Sunlight (C) Water (D) Fossil fuels

A depleting source of energy is fossil fuels. Fossil fuels are buried flammable geologic deposits of organic substances such as dead plants and... View Article

Find the zeroes of the following polynomial 5x^2 – 4 – 8x and verify the relationship between zeros of the polynomial and the coefficients of the polynomial

Given polynomial is 5x2 - 8x - 4 = 5x2 - 10x + 2x - 4 = 5x (x - 2) + 2 (x - 2) = (5x + 2) (x - 2) Hence, the value of 5x2 - 8x - 4 = 0 when... View Article

Use Euclid’s Division Algorithm to find the HCF of 726 and 275

HCF of 726 and 275 726 = 275 x 2 + 176 275 = 176 x 1 + 99 176 = 99 x 1 + 77 99 = 77 x 1 + 22 77 = 22 x 3 + 11 22 = 11 x 2 + 0 Therefore,... View Article

Let x and a stand for distance. Show that ∫dx/√(a^2-x^2)=1/a sin^-1 a/x dimensionally correct

Dimension on the left side = ∫dx/√(a2-x2)= [L0] Dimension on the right side = 1/a sin-1 (a/x) = [L-1] So, dimension of LHS... View Article

Deuteron and alpha particle are put 1 A apart in air magnitude Å apart in air. Magnitude of intensity of electric field due to deuteron of alpha particle is (N/C) (A) Zero (B) 2.88 x 10^11 N/C (C) 1.44 x 10^11 N/C (D) 5.76 x 10^11 N/C

Electric field = 1/4πε0 x q/r2 E = 9 x 109 q/r2 E = 9 x 109 x 1.6 x 10-19/(1 x 10-10)2 On further calculation, we get, E = 1.44 x... View Article

In earthworm gizzard is found in (A) Eighth to tenth segment (B) Eighth segment (C) Twenty-seventh segment (D) Eighth to eleventh segment

Eighth segment The digestive system of earthworm consists of the pharynx, the esophagus, the crop, the intestine and the gizzard. In the eighth... View Article