BSc. General Science -Entrance Questions and Solutions
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1. Which of the following elements does not contain neutron?
H
He
Be
Li
Correct Answer
Wrong Answer
2. The oxidation number of Nitrogen is - 1 in
Option A:NH3
Option B:NH2OH
Option C:N2
Option D:N2O
Option A
Option B
Option C
Option D
Correct Answer
Wrong Answer
3. The number of unpaired electrons in oxygen is
2
3
4
6
Correct Answer
Wrong Answer
4. The unit of radioactivity is
Fajan
Bohr
Curie
Debye
Correct Answer
Wrong Answer
5. Which of the following compounds gives a positive AgNO3 test?
Option A: CCl4 (Carbon tetrachloride)
Option B: CH3Cl (Chloromethane)
Option C: CHCl3 (Chloroform)
Option D: NaCl (Sodium chloride)
Option A
Option B
Option C
Option D
Correct Answer
Wrong Answer
6. At same temperature and pressure equal volume of all gases has same number of molecules’ this statement belongs to
Boyle’s law
Avogadro’s law
Charles’ law
Graham’s law
Correct Answer
Wrong Answer
7. A gas diffuses 4 times as fast as oxygen. The molecular weight of the gas
4.2
8
16
2
Correct Answer
Wrong Answer
8. In a solution containing 1 mole alcohol and 4 mole water, the mole fraction of alcohol is
1/4
3/4
4/5
1/5
Correct Answer
Wrong Answer
9. The oxidation number of Mn in MnO2 is
+2
+4
+6
+7
Correct Answer
Wrong Answer
10. Vapour pressure at equilibrium of a liquid in a closed vessel depends only on
Concentration
Temperature
Pressure
Volume
Correct Answer
Wrong Answer
11. Which one is Eka silicon?
Sc
P
Ga
Ge
Correct Answer
Wrong Answer
12. The compound used as refrigerant is
Option A: CF4
Option B: CCl4
Option C: COCl2
Option D: CCl2F2
Option A
Option B
Option C
Option D
Correct Answer
Wrong Answer
13. Ethylene reacts with alkaline KMnO4 (Bayer's reagent) to form
Oxalic acid
Acetic acid
Glycerol
Glycol
Correct Answer
Wrong Answer
14. The crystalline form of carbon is
Diamond
Graphene
Fullerene
All of the above
Correct Answer
Wrong Answer
15. Froth floatation process is done for
Oxide ore
Sulphide ore
Carbonate ore
Nitrate ore
Correct Answer
Wrong Answer
16. 4 g NaOH in 1 L solution is
1N
0.1N
4N
0.4N
Correct Answer
Wrong Answer
17. The pH of a solution containing 3.65 g of HCl per ltre is
0.01
0.1
1.0
10.0
Correct Answer
Wrong Answer
18. The rate constant of a reaction depends upon
Temperature
Initial concentration
Time of the reaction
Extent of reaction
Correct Answer
Wrong Answer
19. Which of the following metals is readily corroded in moist air?
Cu
Ag
Au
Fe
Correct Answer
Wrong Answer
20. When a solid is converted into a liquid, entropy will
Remain the same
Become zero
Decrease
Increase
Correct Answer
Wrong Answer
21. Lassaigne’s test is not used to detect which one of the following elements in organic compounds?
S (Sulfur)
N (Nitrogen)
Br (Bromine)
C (Carbon)
Correct Answer
Wrong Answer
22. CH4 is a/an
Alcohol
Ketone
Ether
Alkane
Correct Answer
Wrong Answer
23. Ethyne on polymerization gives
Polythene
Benzene
Phenol
Ethane
Correct Answer
Wrong Answer
24. Toluene on oxidation with alkaline KMnO4 gives
Benzoic acid
Phenol
Benzaldehyde
Aniline
Correct Answer
Wrong Answer
25. Which of the following is a Friedel Craft’s catalyst
Option A: AlCl (Aluminum chloride)
Option B: H2SO4 (Sulfuric acid)
Option C: PCl5 (Phosphorus pentachloride)
Option D: CH3COCl (Acetyl chloride)
Option A
Option B
Option C
Option D
