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Light energy is converted into chemical energy in the presence of (A) Pyrenoids (B) Chloroplasts (C) Ribosomes (D) Mesosomes

Chloroplasts In the chlorophyll containing cells of photosynthetic organisms, the electromagnetic energy of sunlight is converted to chemical energy. In... View Article

The fossil fuels include (A) uranium (B) soil (C) natural gas (D) plants

Natural gas Fossil fuels are made from plants and animals that decompose. In the Earth’s surface, these oils contain carbon... View Article

The minimum velocity in (ms^-1) with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is: (A) 60 m/s (B) 30 m/s (C) 15 m/s (D) 25 m/s

Given A car avoid skidding ⇒ mv2/r = μmg Here, μ is frictional coefficient , v is minimum speed to... View Article

A man starts his job with a certain monthly salary and earns a fixed increment every year. If his salary was Rs 1500 after 4 year of service and Rs 1800 after 10 years of service, what was his starting salary and what is the annual increment?

Let Rs x be the starting salary of a man and Rs y be the fixed annual increment. Then, Salary... View Article

A drop of water of radius 0.0015 mm is falling in air. If the coefficient of viscosity of air is 2.0 x 10^-5 kgm^-1s^-1, the terminal velocity of the drop will be: (The density of water = 10^3 kgm^-3 and g = 10ms^-2) (A) 1.0 x 10^-4 ms^-1 (B) 2.0 x 10^-4 ms^-1 (C) 2.5 x 10^-4 ms^-1 (D) 5.0 x 10^-4 ms^-1

Here, r = 0.0015 mm ⇒ 0.0015 x 10-3m η = 2.0 x 10-5 kgm-1s-1 ρ = 1.0 x 103kgm-3... View Article

Stainless steel contains in addition to iron nickel and chromium which imparts (A) Hardness to the alloy (B) Tensile strength to the alloy (C) Luster to the alloy (D) None of these

Tensile strength to the alloy In addition to iron, carbon and chromium, modern stainless steel may also contain nickel, niobium,... View Article

Juxtaglomerular apparatus is made up of (A) juxtaglomerular cell, macula densa and lacis cell (B) juxtaglomerular cell, purkinje cell and chief cell (C) juxtaglomerular cell, lacis cell and myoepithelial cell (D) juxtaglomerular cell, macula densa and argentaffin cell

juxtaglomerular cell, macula densa and lacis cell The juxtaglomerular apparatus is a specialized sensitive region that is formed by the... View Article

What would happen if forest disappears?

If forest disappear the following changes occurs, 1. The amount of carbon dioxide in air will increase, resulting in the... View Article

Isotopes have same atomic number but different atomic mass number. State whether the given statement is True or False (A) True (B) False

True An atomic mass number tells you the total number of protons and neutrons present in an atomic nucleus. Atoms... View Article

Draw a circle with diameter 6 cm. (i) 6 cm (ii) 8.4 cm. In each case measure the length of the radius of the circle drawn

(i) AB is the diameter of the circle AB = 6 cm and OA is the radius of the circle... View Article

The HCF of 455 and 42 using Euclid algorithm is (A) 7 (B) 6 (C) 5 (D) 4

Euclid’s division lemma states that, Any positive real number a can be represented as a = bq + r where... View Article

Which of the following is the heaviest metal? (A) Silver (B) Copper (C) Gold (D) Lead

Gold is the heavy metal. Hence, the correct option is (C)

In a parallelogram ABCD, E and F are the mid-points of sides AB and CD respectively. Show that the line segments AF and EC trisect the diagonal BD.

Given: ABCD is a parallelogram. E and F are the mid-points of sides AB and CD respectively. To prove: AF... View Article

The part of the electromagnetic spectrum which is suitable for radar systems used in aircraft navigation: (A) X – Rays (B) Gamma Rays (C) Microwaves or short radio waves (D) Ultraviolet

Microwaves and short radio waves X-rays, gamma rays and ultraviolet rays have larger wavelengths and thus are not suitable for... View Article

What happens when ethanol is oxidised with chromic anhydride in glacial ethanoic acid?

When ethanol is treated with chromic anhydrous in the presence of glacial ethanoic acid, the formation of ethanal takes place... View Article

Aquatic plants use CO2 dissolved in water for (A) breakdown of toxic materials (B) respiration (C) excretion (D) photosynthesis

Photosynthesis Carbon Dioxide also known as CO2 is present in water as a dissolved gas. CO2 can dissolve in water... View Article

Which of the following reduces Tollen’s reagent? (A) Cane sugar (B) Starch (C) Glucose (D) All of these

Glucose reduces Tollen’s reagent. Hence, the correct option is (C)

AB and CD are two common tangents to circles which touch each other at C. If D lies on AB such that CD = 4 cm, then AB is equal to (A) 4 cm (B) 6 cm (C) 8 cm (D) 12 cm

Given CD = 4 cm We know that tangent drawn from an exterior point are equal Hence, From the figure,... View Article

Prove that any rectangle is a cyclic quadrilateral

Consider ABCD is a rectangle Hence, ∠A = ∠B = ∠C = ∠D = 900 [Each angle of a rectangle... View Article

Which of the above is a pair of geometrical isomers? (A) I and II (B) I and III (C) II and IV (D) III and IV

II and IV Geometrical isomerism is a type of stereoisomerism having the same molecular formula and same structure but differ... View Article

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