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A student plots V-I graphs for three samples of nichrome wire with resistances R1 , R2 and R3 . Choose from the following the statement that holds true for this graph. (a) R1 = R2 = R3 (b) R1 > R2 > R3 (c) R3 > R2 > R1 (d) R2 > R1 > R3

(c) R3 > R2 > R1 Comparing the slopes of the three samples. The slope for R1 is the maximum and the slope for R3 is the minimum. (... View Article

The maximum resistance which can be made using four resistors each of 2 Ω is (a) 2 Ω (b) 4Ω (c) 8Ω (d) 16 Ω

c) 8ohm The maximum resistance of a set of resistors can be obtained by connecting them in series. Hence, R = 2+2+2+2 = 8 ohm A circuit is... View Article

Person suffering from cataract has (a) elongated eyeball (b) excessive curvature of eye lens (c) weakened ciliary muscles (d) opaque eye lens

(d) Opaque eye lens A person suffering from cataract has an opaque eye lens. In cataracts, the crystalline lens of the people becomes milky and... View Article

Consider the following reasons for the reddish appearance of the sun at the sunrise or the sunset : A. Light from the sun near the horizon passes through thinner layers of air. B. Light from the sun covers larger distance of the earth’s atmosphere before reaching our eyes. C. Near the horizon, most of the blue light and shorter wavelengths are scattered away by the particles. D. Light from the sun near the horizon passes through thicker layers of air. The correct reasons are (a) A and C only (b) B, C and D (c) A and B only (d) C and D only

(b) B, C and D Explanation The reddish appearance of the sun at sunrise or sunset is due to the scattering of light by the molecules of air and... View Article

How can we control hypothyroidism?

Limit processed foods and those high in fat and sugar. Proper treatment can also help you manage your weight and other symptoms of... View Article

What is hyperthyroidism?

Hyperthyroidism (overactive thyroid) occurs when your thyroid gland produces too much of the hormone thyroxine. Hyperthyroidism can accelerate... View Article

State the function of thyroxine in human body.

The thyroid gland is a vital hormone gland: It plays a major role in the metabolism, growth and development of the human body. It helps to... View Article

Where is thyroid gland situated in our body?

Thyroid gland is found at the front of the neck, under the voice box. It is butterfly-shaped: The two side lobes lie against and around the... View Article

State an important advantage of using AC over DC.

Advantages of alternating current (AC) over direct current (DC) AC is easy and cheaper to generate than DC. AC can be transferred to long... View Article

Name the phenomenon that explains the working of an electric generator.

Electromagnetic Induction is the phenomenon used for the electric generator. Faraday’s First Law: The Faraday’s First law of... View Article

Name two countries, other than India, where power plants based on geothermal energy are operational.

Indonesia and Iceland are some countries where geothermal power plants are operational. Geothermal energy is the thermal energy generated and... View Article

What are geothermal energy hot-spots?

Geothermal energy is the thermal energy generated and stored inside the Earth’s crust. The center of the Earth remains at the same... View Article

How many metals are present in second period of periodic table?

Two metals are present in second period of periodic table that is Lithium and Beryllium. Lithium exhibits distinct properties due to the tiny... View Article

Covalent compounds have low melting and boiling point. Why?

Covalent compounds have low melting point due to the weak van der Waal's forces,hus less energy is required to break the force of bonding.... View Article

Permafrost – Causes and Effects of Thawing Permafrost

Latest context: The latest Intergovernmental Panel on Climate Change (IPCC) report has warned that increasing global warming will result in... View Article

15 Sep 2021: The Hindu Analysis

UPSC Current Affairs Preparation: The Hindu Analysis Watch expert analysis of ‘The Hindu’ dated 15th Sep 2021. Important news and views to boost... View Article

Robots in Warfare [UPSC GS 3 Notes]

For the uninitiated, military robots are either autonomous or remote-controlled robots designed for use in military applications such as search... View Article

In one glass, milk and water are mixed in the ratio of 3:5 and in another glass they are mixed in the ratio 6:1. In what ratio should the content of the two glasses be mixed together so that the next mixture contains milk and water in the ratio of 1:1?

The ratio of milk and water in mixture 1 is 3:5 Let the quantity of mixture-1 be x Quantity of milk in mixture 1 Quantity of water in... View Article

The Molecular Weight Of Benzoic Acid In Benzene As Determined By Depression In The Freezing Point Method Corresponds To (A) Solvation Of Benzoic Acid. (B) Ionization Of Benzoic Acid. (C) Dimerisation Of Benzoic Acid.(D) Trimerisation Of Benzoic Acid.

Answer : (C) Dimerisation of benzoic acid. Benzoic acid is an organic compound that is described by the chemical formula C6H5COOH. It consists... View Article

Sterilization of tissue culture medium is done by (A) Keeping the medium at -20°C. (B) Filtering the medium through a fine sieve. (C) Mixing the medium with antifungal agents. (D) Autoclaving of the medium at 120°C for 15 minutes.

The correct answer is (D) Autoclaving of the medium at 120°C for 15 minutes. Explore more such questions and answers at BYJU’S.... View Article

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