Practice General science mcq - general science mcq Online Quiz (set-2) For All Competitive Exams

Q-1)   Two bodies A and B have masses M and m respectively where M > m and they are at a distance d apart. Equal force is applied to them so that they approach each other. The position where they hit each other is

(a)

(b)

(c)

(d)

Explanation:

As net external force on the system is zero therefore position of their centre of mass remains unaffected i.e. they will hit each other at the point of centre of mass. The centre of mass of the system lies nearer to A because MA > MB .

Q-2)   Cobalt-60 is generally used in radiation treatment because it ejects

(a)

(b)

(c)

(d)

Q-3)   What is the weight of one atom of Hydrogen in grams?

(a)

(b)

(c)

(d)

Q-4)   The forbidden gap in the energy bands of germanium at room temperature is about

(a)

(b)

(c)

(d)

Explanation:

Δ$E_{g(Germanium)}$ = 0.67 eV.

Q-5)   Which one of the following colours is seen in the middle of a Rainbow?

(a)

(b)

(c)

(d)

Q-6)   Which one among the following is the correct order of strength of acids ?

(a)

(b)

(c)

(d)

Q-7)   Insulin is produced by

(a)

(b)

(c)

(d)

Q-8)   Rh factor derives its name from a type of

(a)

(b)

(c)

(d)

Q-9)   Minamata disease was caused by toxic quantities of the following metal.

(a)

(b)

(c)

(d)

Q-10)   Energy conservation means

(a)

(b)

(c)

(d)

Q-11)   A genetically engineered form of brinjal, known as the Bt brinjal has been developed. The objective of this is

(a)

(b)

(c)

(d)

Q-12)   Archeopteryx is

(a)

(b)

(c)

(d)

Q-13)   Which of the following acid is found in molasses?

(a)

(b)

(c)

(d)

Q-14)   Discharge of Nitrogen causes

(a)

(b)

(c)

(d)

Q-15)   Bryophytes are photosynthetic but do not have vascular tissue and true roots. This feature enables them to resemble with which of the following?

(a)

(b)

(c)

(d)

Q-16)   Which one of the following is not correctly matched?

(a)

(b)

(c)

(d)

Q-17)   Match List-I with List-II:
List-I List-II
A. Electrolysis 1. Resistant to corrosion
B. Anodization 2. Laws of electrolysis
C. Electrochemical cell 3. Recharging of battery
D. Faraday 4. Chemical energy into electrical energy
Select the correct answer using the codes given below the list:

(a)

(b)

(c)

(d)

Explanation:

Q-18)   Plaster of paris is obtained –

(a)

(b)

(c)

(d)

Explanation:

$CaSO_4.{2H_2O} ⟶↖Δ CaSO_4 . 1/2H_2O + 3/2H_2O$

Q-19)   Which of the following can cause cancer as well as cure it depending upon its intensity and use?

(a)

(b)

(c)

(d)

Q-20)   Which of the following statements is /are correct? According to Dalton’s theory
  1. An atom is the smallest particle of matter
  2. An atom is the smallest particle of an element
  3. An atom is the smallest indivisible particle of an element that can take part in a chemical change
  4. An atom is the radioactive emission

(a)

(b)

(c)

(d)

Q-21)   The people who eat cooked food with adulterated mustard oil can cause dangerous disease (Dropsy). Which one of the following reason may not be correct (As happened in India)?

(a)

(b)

(c)

(d)

Q-22)   ‘Dialysis’ is related to

(a)

(b)

(c)

(d)

Q-23)   Phenylketonuria is an innate error in metabolism, which reference about

(a)

(b)

(c)

(d)

Q-24)   Consider the following statements:
Hard water does not give lather with soap because hard water contains:
  1. calcium bicarbonate
  2. magnesium bicarbonate
  3. chlorides of calcium and magnesium
  4. sulphates of calcium and magnesium
Which of these statements are correct?

(a)

(b)

(c)

(d)

Explanation:

Since hard water contains soluble chloride and sulphate salts of calcium and magnesium it forms an insoluble curdy precipitate with soap.

${2C_{17}H_{35}COONa} ↙\text"soluble sodium stearate (soap)" + {CaCl_2} ↙\text"calcium chloride (in hard water)" → {(C_{17}H_{35}COO)_2} ↙\text"insoluble calcium stearate" Ca + 2NaCl$

${2C_{17}H_{35}COONa} ↙\text"soluble sodium stearate" + {MgSO_4} ↙\text"Magnesium chloride (in hard water)" → {(C_{17}H_{35}COO)_2 } ↙\text"insoluble magnesium stearate (soap) " Mg + Na_2SO_4$

Q-25)   Dengue is a fever caused and transmitted to another human by

(a)

(b)

(c)

(d)

Q-26)   Which of the following statements is/are correct ?
  1. Pure Si doped with trivalent impurities gives a p-type semiconductor
  2. Majority carriers in a n-type semiconductor are holes
  3. Minority carriers in a p-type semiconductor are electrons
  4. The resistance of intrinsic semiconductor decreases with increase of temperature

(a)

(b)

(c)

(d)

Q-27)   Consider the following statements and select the correct answer from given codes below.
  1. Water becomes harder due to the presence of Calcium Sulphate and it is not usable.
  2. Diamond is harder than copper and iron.
  3. Oxygen is the main component of air.
  4. Nitrogen is used in the manufacture of vegetable ghee.
Code

(a)

(b)

(c)

(d)

Q-28)   Who was the scientist who discovered that malaria is caused by Plasmodium parasite?

(a)

(b)

(c)

(d)

Q-29)   Statement I :
Coal-based thermal power stations contribute to acid-rain.
Statement II :
Oxides of carbon are emitted when coal burns.

(a)

(b)

(c)

(d)

Q-30)   The major chemical compound found in human kidney stones is

(a)

(b)

(c)

(d)