Objective question with answer for Madhyamik (West bengal)

 Physical science

1.      The no of electron and neutron in an atom is 6 and 8 resp. what is the mass number of the atom?

Ans: Mass no=no of electron no of neutron.

Mass no=6+8=14

2.      What is the number of molecules present in one mole of oxygen molecules?

Ans: No of molecules=6.023x10²³

3.      What is measured by voltmeter?

Ans: potential difference

4.      Write the name of one organic green house gas.

5.      Ans: Methane. 

6.        How many period and

Groups are there in Mendeleev’s periodic table?

Ans: Period=7 & Group=9

7.        Which has greatest penetrating power among α, β, and Υ-rays?

Ans: gamma

8.        Write the monomer of P.V.C.

Ans: Vinyl Chloride

9.        Write the name of inorganic green house gas.

Ans: Carbon dioxide.

10.      What is the colour of ring formed in the ring test of nitric acid?

Ans: Brown

11.      Which other metal is mixed with copper in brass?

Ans: Zinc

Ans: Compressed natural gas.

12.      What is indicated by the number 238 in   ₉₅U²³⁸ ?

Ans: Mass number

13.      Name an acid which has greater affinity to water?

Ans: Sulphuric acid

14.      What will be change in atomic mass number if an alpha particle is emitted from an atom?

Ans:  It will be 4 less than mother element.

15.      Which has greatest mass α, β, and Υ?

Ans: α ray

16.    What will be volume of an ideal gas at absolute temperature?

Ans: 22.4 litre

17.     By which instrument electric current is measured?

Ans: ammeter

18.    Write the name of positively charged particle in the nucleus of an atom?

Ans: proton.

19.    If two wire having resistance 4 ohms and 8 ohms are joined in parallel combination, what will be equivalent resistance?

Ans: Equivalent resistance=  ohm

20.    Mention one difference between emf and pot diff.

Ans: Emf is applicable where another form of energy is converted to Electrical form and pot diff is applicable to circuit where electrical energy is converted to another form of energy. 

21.    Write the structural formula of the compound isomeric with propanal.

Ans:C_2­H₅CHO

 22.    How does an ammeter have to be connected with in a circuit?

Ans: In series.

23.    Name an atom which do not contain neutron.

        Ans: ₁H¹(protium)

24.    What is rogue element?

        Ans: Hydrogen

25.    What is the formula of washing soda?

Ans: Na₃CO₃.10H₂O

26.    What is nucleon?

Ans: Proton and neutron in the nucleus.

27.    Which force binds the nucleon?

Ans: Nuclear force.

28.    What is the commercial name of sulphuric acid?

Ans: Oil of vitriol

29.    What is the boiling point of water in absolute scale of temperature?

Ans: 373K

30.    Between 50⁰C and 50⁰k which one is higher?

Ans: 50⁰C

31.    Which is the heaviest particle of an atom?

Ans: Neutron.

32.    Write the name of simplest alkane.

Ans: Methane

33.    Write the name of a liquid metal?

Ans: Mercury.

34.     Write the name of one liquid non metal.

        Ans: Bromine

35.    Which acid identified by ring test?

        Ans:Nitric acid.

36.    Which gas is called Marsh gas?

        Ans: Methane.