Given C(graphite) + O2 (g) → CO2 (g) ; ∆r Ho = −393.5 kJ mol−1
H2 (g) + [1 / 2] O2 (g) → H2O (l) ; ∆r Ho= −285.8 kJ mol−1 CO2 (g) +... View Article
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Consider a compound slab consisting of two different materials having equal lengths, thicknesses and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is (A) √2K (B) 3K (C) (4/3)K (D) (2/3)K
The thermal resistances can be added as they are in series. Here the width of the combined slab is twice... View Article
The amount of heat produced in a wire depends on its materials (A) Length (B) Thickness (C) Length and thickness (D) None of these
Amount of heat produced in a wire = I2R Where R is resistance of wire I is current through wire... View Article
What are the temperate grasslands of South Africa called?
The temperate grasslands of South Africa are called the velds. Velds are rolling plateaus with differing heights ranging from 600... View Article
Collective noun of geese
Collective Noun: A name used for a group of people, animals, or things. Example, cattle, family, herd, team, etc.Collective nouns are... View Article
What type of stoichiometric defect is shown by: (i) ZnS (ii) AgBr
(i) ZnS shows Frenkel defect (ii) AgBr shows both Frenkel and Schottky defect Learn more: Defects in solids
The refracting angle of a prism is A, and refractive index of the material of the prism is cot (A/2). The angle of minimum deviation is:(A) 1800 – 2A(B) 900 – 2A(C) 1800 + 2A(D) 1800 – 3A
Here, μ = cot (A/2) According to prism formula, \(\begin{array}{l}\mu = \frac{sin\frac{A+\delta _{m}}{2}}{sin\frac{A}{2}}\\\mu = \frac{cos \frac{A}{2}}{sin\frac{A}{2}}\end{array} \) Therefore, \(\begin{array}{l}sin \frac{A+\delta... View Article
Factorise 2x2 + 3x – 90
Given 2x2 + 3x – 90 This can be written as, 2x2 + 15x – 12x – 90 x (2x... View Article
Which of the following can be made into crystal? (a) A Bacterium (b) An Amoeba (c) A Virus (d) A Sperm
The answer is ‘A Virus’. Viruses are considered as the intermediates between living and non- living as they cannot metabolize... View Article
The thickness of stratospheric ozone layer is measured in/on (A) Sieverts (B) Dobson units (C) Melson units (D) Beaufort scale
The thickness of stratospheric ozone layer is measured in Dobson units. Hence, the correct option is (B)
Soil fertility is reduced by: (a)crop rotation (b)nitrogen fixing bacteria (c)decaying organic matter (d)intensive agriculture
Soil fertility is reduced by intensive agriculture. It is a method by which soil gets harmed and the nutrient content... View Article
What is the scientific study of earthquakes called?
The scientific study of earthquake is called ‘Seismology’. Learn more: Seismology
Give the scientific reason for the following. In the atmosphere oxygen is available as O2 but not as O
Valency of oxygen is 2 since it can accept or share 2 electrons to form a bond. Therefore, it is... View Article
The language of discourses of Gautama Buddha was (A) Sanskrit (B) Pali (C) Magadhi (D) Bhojpuri
‘Pali’ was the language of discourses of Gautama Buddha. It is the sacred language of all texts of Buddhism and... View Article
Why does nitrogen show catenation properties less than phosphorus?
Catenation is much more common in phosphorous compounds than in nitrogen compounds. This is because of the relative weakness of... View Article
Who is the head of a tehsil?
A tehsildar is the head of a tehsil. A tehsildar is a revenue officer who is accompanied with revenue inspectors.... View Article
Coconut fruit is a (A) Capsule (B) Drupe (C) Berry (D) Nut
Coconut fruit is a drupe. Drupes are fleshy fruits developing from either one or many fused carpels having one or... View Article
Why was Nelson Mandela sentenced to life imprisonment in 1964?
South African anti-apartheid leader and world human rights activist Nelson Mandela was sentenced to life imprisonment on June 12, 1964... View Article
Factorise : a – b – a2 + b2 (A) (a-b) [1-(a+b)] (B) (a+b) [1-(a-b)] (C) (a-b) [1-(a-b)] (D) none of these
Given a – b – a2 + b2 a – b – a2 + b2 = (a – b) –... View Article
Which of the following has a definite length? (a) A line (b) A line segment (c) A ray (d) None of these
A line segment has definite length and can be drawn on a paper. Hence, the correct answer is option (b)
