1. GAJWANI SCHOOLS & COLLEGES
Properties of water
Q1 M.C.Q’S 1At which temperature is pure water converted in to solid form by cooling?
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1

2. GAJWANI SCHOOLS & COLLEGES
Properties of water
0oC
4oC
37oC
100oC
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1

3. GAJWANI SCHOOLS & COLLEGES
Properties of water
ANS. 0oC 2 At which temperature is does pure water boil? A)0oC B)80oC C) 100oC D)40oC
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1

4. GAJWANI SCHOOLS & COLLEGES
Properties of water
ANS. 100oC 3 Which water is considered as pure water? A) Well water B) Rain water C) River water D) Sea water.
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1

5. GAJWANI SCHOOLS & COLLEGES
Properties of water
ANS. Rain water 4 Due to what is the hardness of water? A) Washing soda B) Alum C) Bleaching powder D) Dissolved salt
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1

6. GAJWANI SCHOOLS & COLLEGES
Properties of water
ANS. Dissolved salts 5 Which are the component elements of water? A) Hydrogen and carbon B) Carbon and oxygen C) Hydrogen and oxygen D) Hydrogen and Chlorine.
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1

7. GAJWANI SCHOOLS & COLLEGES
Properties of water
ANS. Hydrogen and oxygen. 6 Which gas is produced at anode ( positive pole) By electrolysis of water?
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1

8. GAJWANI SCHOOLS & COLLEGES
Properties of water
Oxygen
Hydrogen
Nitrogen
Chlorine
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1

9. GAJWANI SCHOOLS & COLLEGES
Properties of water
Ans. Oxygen. 7 What is the proportion by volume of hydrogen gas and oxygen gas during electrolysis of water?
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1

10. GAJWANI SCHOOLS & COLLEGES
Properties of water
1:2
2:1
1:8
8:1
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1

11. GAJWANI SCHOOLS & COLLEGES
Properties of water
Ans. 2:1 8 Which substance is added to remove the hardness of water? A) Alum B) Washing soda C) Bleaching powder D) Chlorine tablets
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1

12. GAJWANI SCHOOLS & COLLEGES
Properties of water
Ans. Chlorine tablets 9 Which substance is added to water to get clay particles of muddy water setteled quickly?
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1

13. GAJWANI SCHOOLS & COLLEGES
Properties of water
Bleaching powder
Washing soda
Alum
Chlorine tablets
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1

14. GAJWANI SCHOOLS & COLLEGES
Properties of water
Ans. Alum
GAJWANI SCHOOLS & COLLEGES
CH 4 STD 7 SCIENCE SEM 1 WEEK 2DAY 1