Science Quiz: Day 18

November 21, 2022

Which of the following substances undergo ‘sublimation’ on heating
1.Iodine
2. Napthalene
3. Camphor

(A) 1 and 2
(B) 1 and 3
(C) 2 and 3
(D) All of them

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Answer – D

Amalgam is a term used for an alloy of a metal with:

(A) Copper
(B) Mercury
(C) Lead
(D) Aluminium

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Answer – B

Gammaxene, D.D.T. and Bleaching powder are important compounds of :

(A) Chlorine
(B) Nitrogen
(C) Sulphur
(D) Phosphorus

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Answer – A

L.P.G. is a hydrocarbon consisting of a mixture of

(A) Methane and Butane
(B) Propane and Butane
(C) Ethane and Propane
(D) Ethane and Butane

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Answer – B

Gargling with a solution of table salt is known to provide relief for a sore throat because ___ ?

(A) It kills bacteria
(B) It works as analgesic
(C) It dehydrates water from inflammatory tissues by Osmosis
(D) Placebo effect

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Answer – C

A warm salt water gargle soothes the inflamed membranes of your throat and prevents further thickening. The salt in water helps in dehydration in the swollen part of the throat and flushes out all the bacteria in the throat.

Polymetallic Modules (PMN) predominantly contain_____?

(A) Calcium
(B) Magnesium
(C) Manganese
(D) Copper

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Answer – C

Aluminium is getting popular worldwide today as a ―Green Metal. Which among the following properties of Aluminium makes it a Green Metal?

(A) Aluminium has been providing a replacement of wood for saving forests and contributes in environment protection
(B) Aluminium is a light metal and it is resistant to corrosion
(C) Aluminium has fairly high rate of recycling and it can be re-used repeatedly without its quality deteriorating
(D) The lands after the Bauxite mining can be restored very quickly and easily

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Answer – C

Now a days, a little pack of Silica Gel (granular beads of Silica made from Sodium Silicate) comes with many products to control humidity and avoid spoilage or degradation of some goods. Which among the following property of Silica gel makes it useful for that purpose?

(A) Silica gel molecules are hydrophilic with large surface area and so its molecules trap the moisture
(B) Silica gel is a Hygroscopic substance with large surface area so its molecules absorb the moisture.
(C) Silica gel molecules are with a portion that is charge-polarized and capable of hydrogen bonding, thus bonds with the water molecules
(D) The semi permeable pouch in which silica gel is placed absorbs the moisture which later reacts with water

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Answer – B

Consider the following statements:
1. The space between the valence and conduction bands is zero in Graphene
2. This property of Graphene makes it an excellent transistor of commercial viability
Which among the above statements is/ are correct?

(A) Only 1
(B) Only 2
(C) Both 1 & 2
(D) Neither 1 nor 2

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Answer – A

For respiration in deep sea, divers use mixture of -

(A) Oxygen and helium
(B) Oxygen and hydrogen
(C) Oxygen and carbon dioxide
(D) Oxygen, Helium & nitrogen

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Answer – D

The minimum temperature at which a combustible substance catches fire is called -

(A) Fireless temperature
(B) Ignition temperature
(C) Static temperature
(D) Optimum temperature

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Answer – B

Haber Process is used to produce which among the following?

(A) Potash
(B) Ammonia
(C) Urea
(D) Nitrates

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Answer – B

Which among the following is the unit of the scale used for measurement of the spicy heat of a chili pepper?

(A) Smith
(B) Wright
(C) Orville
(D) Scoville

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Answer – D

Which among the following is – Fool’s Gold ?

(A) Copper Sulphate
(B) Iron Sulphide
(C) Brass
(D) Silver Bromide

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Answer – B

The mineral pyrite, or iron pyrite, also known as fool’s gold, is an iron sulphide with the chemical formula FeS₂. Pyrite is the most abundant sulphide mineral. Pyrite’s metallic lustre and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fool’s gold

Which among the following acid is used to ascertain, whether pure Ghee has been adulterated with Vanaspati or Margarine?

(A) Sulphuric Acid
(B) Nitric Acid
(C) Hydrochloric Acid
(D) Boric Acid

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Answer – C

Ghee Vanaspati or Margarine Take about one tea spoon full of melted sample of Ghee with equal quantity of concentrated Hydrochloric acidin a stoppered test tube and add to it a pinch of sugar. Shake for one minute and let it for five minutes. Appearance of crimson colour in lower (acid) of Vanaspati or Margarine

Which among the following first increases than decreases in a Period of a periodic table?

(A) Metallic property
(B) Chemical Reactiveness
(C) Valency
(D) Electron affinity

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Answer – C

Kimberley Process is related to which among the following ?

(A) Gold
(B) Diamonds
(C) Semi Precious Stones
(D) Aluminium

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Answer – B

Pearl is mainly made up of which among the following?

(A) Protein
(B) Calcium Carbonate
(C) Silica
(D) Sodium Carbonate

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Answer – B

Which among the following is not correctly matched?

(A) Brass - copper and zinc
(B) Duralumin - Copper and aluminium
(C) Constantan: Copper and Nickel
(D) White Gold- Gold and Silver

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Answer – D

Which among the following gives hissing sound when dissolved into H2O?

(A) Calcium carbonate
(B) Calcium hydroxide
(C) Calcium oxide
(D) Calcium chloride

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Answer – C