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Basic Science

10th Class - CBSE - General Knowledge - 9798 Questions - 0 Concepts

Important Questions

Q1 Single Correct Hard
If by an unknown accident the acid-secreting cells of the stomach wall of an individual are damaged, digestion of which one of the following biomolecules will be affected to a greater extent?
  • A. Protein only
  • B. Lipid
  • C. Carbohydrate only
  • D. Protein and Carbohydrate

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Q2 Assertion & Reason Hard
ASSERTION

When a block body is thrown in a furnace, initially it is darkest and finally it is brightest.

REASON

The emissivity as well as absorptive power of block body is 1.

  • A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • C. Assertion is correct but Reason is incorrect
  • D. Assertion is incorrect and Reason is correct

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1 Verified Answer | Published on 24th 10, 2020

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Q3 Single Correct Hard
When a simple pendulum is taken to the moon from the earth, its time period
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. None of the above

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1 Verified Answer | Published on 24th 10, 2020

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Q4 Single Correct Hard
$$CCl_3\! \! -\! \! CH=O$$ reacts with chlorobenzene in presence of sulphuric acid & produces :


  • A.
  • B.
  • C.
  • D.

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Q5 Single Correct Hard
In which of the following option, second compound gives a precipitate more rapidly then the first compound when reacted with $$AgNO_3$$ in ethanol.

  • A.
  • B.
  • C.
  • D. $$Ph\! \! -\! \! CH_2\! \! -\! \! Br \: or\: CH_2=CH\! \! -\! \! CH_2\! \! -\! \! Br$$

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Q6 Multiple Correct Hard
Out of the following which reactions give polar product :

  • A. $$CH_3 - C\equiv C - CH_3\xrightarrow[Quinoline]{H_2 /pd/C}$$
  • B. $$C_2H_5 - C\equiv C - C_2H_5\xrightarrow[]{Na /NH_3(\ell)}$$
  • C. $$CH_3 - C\equiv C - C_2H_5\xrightarrow[]{Na /NH_3(\ell)}$$
  • D.

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Q7 Assertion & Reason Hard
ASSERTION

Compound II is more reactive towards nucleophilic addition reaction.

REASON

Statement - 2 : Cyclic ketones are more reactive than acyclic ketone due to less steric hindreance and compact structures of cyclic ketone.

  • A. Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.
  • B. Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
  • C. Statement-1 is True, Statement-2 is False
  • D. Statement-1 is False, Statement-2 is True

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1 Verified Answer | Published on 24th 10, 2020

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Q8 Multiple Correct Hard
Choose the correct options :

  • A. Compound $$CH_3(CH_2)NH_2$$ react with KOH and $$CHCl_3$$ produces bad smell.
  • B. $$CH_3 - C\equiv C- H$$ gives white ppt. with ammonical $$AgNO_3$$.
  • C. $$CH_3 - CH (OH) CH_3 $$ react with Lucas reagent and cloudiness appears after 30 minutes.
  • D. $$CH_3 - CH_2 - COOCH_3$$ gives alkaline hydrolysis.

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Q9 Single Correct Hard
$$S_1$$: Addition of inert gas to the equilibrium mixture at constant volume, does not alter the equilibrium.
$$S_2$$: Equilibrium $$H_2(g) + I_2 (g)\rightleftharpoons  2HI(g)\:  is\:  established\:  in\:  V(L)$$. If complete equilibrium mixture is transfered to 2V(L) container then the partial pressure of HI will remain same in the new container.
$$S_3$$ : Formation of diamond is favourable at very high temperature and very high pressure.










  • A. TFF
  • B. TFT
  • C. FTT
  • D. FFT

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1 Verified Answer | Published on 24th 10, 2020

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Q10 Multiple Correct Hard
Choose the correct options :

  • A. The number of ether metamers of $$C_4H_{10}O$$ is three.
  • B. Sec. butyl alcohol has a one chiral atom.
  • C. Geometrical isomerism results because the molecule has two dissimilar groups attached to both ends of double bond
  • D.

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Questions 122475
Subjects 10
Chapters 93
Enrolled Students 65
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