Why does the cord of an electric heater not glow while the heating element does?
The heater’s heating element is made up of an alloy that has very high resistance, so when current flows through... View Article
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How would you distinguish between Zn2+ and Pb2+ using ammonium hydroxide solution?
Zn2+ On adding ammonium hydroxide solution to a solution containing Zn2+ ion a white precipitate is formed. If the addition of ammonium... View Article
The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
Answer: The radius of the curvature of the mirror is defined by the radius of the sphere from which the... View Article
What is the term used for the phenomenon of producing seeds without fertilization?
Apomixis is the development of a seed without fertilization. Apomixis is a type of asexual reproduction which mimics sexual reproduction.... View Article
Which of the following letter does not show lateral inversion? (a) M (b) N (c) I (d) A
Answer: (c) I (d) A T M O I A H U V W X Y are alphabet that do not... View Article
The compound with the lowest boiling point among the following is: (A) HF (B) HCl (C) HI (D) HBr
Answer: Option (B) HCl Explanation The boiling point of covalent compounds(HF, HCl, HBr, HI) increases with an increase in their... View Article
How does the resistance of: i) a semiconductor ii) an alloy vary with temperature?
i) Semiconductor The resistance decreases with an increase in temperature. The resistance is directly proportional to the temperature. The number of... View Article
What type of reaction is the nitration of benzene by nitric acid and sulphuric acid?
Nitration of benzene by nitric acid and sulphuric acid is an Electrophilic substitution reaction. Nitration is the class of chemical process that introduces... View Article
Name the compound that gets oxidised in the following reaction: 4Na + O2 → 2Na2O
Sodium (Na) gains oxygen and gets oxidised to sodium oxide (Na2O). Explanation A substance is said to oxidised if it... View Article
What is the term that is used when a binary compound of oxygen with another element?
A binary compound of oxygen with another element is called oxide. An oxide is a binary compound of oxygen and another... View Article
What is the term used for explaining the dispersion of one liquid in another liquid?
The emulsion is the term used for explaining the dispersion of one liquid in another liquid. The emulsion is a type of... View Article
What is the chemical formula of cryolite which is an important mineral of aluminium?
The chemical formula of Cryolite is Na3AlF6. Cryolite, also known as sodium hexafluoroaluminate, is a colourless compound forming cube-like crystals comprising... View Article
Which of the following is not a form of precipitation? a) Hail b) Fog c) Rain d) Snowfall
Fog is not a form of precipitation Explanation Precipitation is any form of water particle, whether liquid or solid, that falls... View Article
What are the various energy transformations that occur when you are riding a bicycle?
Answer: During riding a bicycle, the muscular energy of the rider is regenerate into heat and mechanical energy. Kinetic energy... View Article
How are the magnitude of repulsion and the distance separating the molecules related?
Liquids and solids are hard to compress because the magnitude of repulsion rises as the distance separating the molecules decreases.... View Article
Choose the odd one out from the following: i) Potato ii) Bamboo iii) Onion iv) Tulips
The correct option is i) Potato. Potato is dicotyledonous. All others given are monocotyledonous. Dicotyledonous and Monocotyledonous Cotyledon refers to... View Article
Dihydrogen under certain reaction conditions combines with all elements except _____.
Dihydrogen under certain reaction conditions combines with all elements except noble gases. This is mainly because the atoms of these... View Article
Which one of the following minerals is a fossil fuel?a)Coal b)Zircon c)Uranium d)Iron
(a) Coal is a fossil fuel. Coal is a black hard rock, flammable in nature. It belongs to the category... View Article
Mesta is a substitute for which of the following crops? a)Wheat b)Rice c)Maize d)Jute
Jute is a substitute for Mesta. Mesta is a herbaceous yearly plant. It is an essential commercial crop after Jute. Its... View Article
What happens to the concentration of H2SO4 during the working of lead-storage battery?
The concentration of H2SO4 decreases during the working of the lead storage battery. The conversion of electrical energy into chemical energy... View Article
