10th Class Physical Sciences - Imp 1 Mark Questions

Q: Name three metals which occur in free state in nature.

A: Gold (Au), Silver (Ag) and Copper (Cu) are available in nature in free state.

Q: How are metals extracted from mineral ores?

A: The extraction of metals from their ores are done in three stages.

a) Concentration or dressing.

b) Extraction of crude metal.

c) Refining or purification of metal.

Q: What are the various types of furnaces?

A: 1) Blast furnace 2) Reverberatory furnace and 3) Retort furnace are the three types of furnaces.

Q: Why are we advised not to use animal fats for Cooking?

A: Animal fats are recently identified as the cause for heart disease and obesity. So it is advised not to use them for cooking.

Q: What is Ethanoic acid?

A: Ethanoic acid is commonly called as acetic acid.

Q: Name the acid present in Vinegar.

A: 5-8 % solution of acetic acid in water is called Vinegar.

Q: What happens when a small piece of sodium is dropped into ethanol?

A: When a small piece of sodium is dropped into ethanol, sodium ethoxide and hydrogen are formed.

SSC Public Exams Bit Bank - Physics and Chemistry Bits

1. Light selects the path which takes least time to travel. This was stated by.....

A) Pierre de Fermat B) Archimedes

C) Newton D) Planck

2. Mirror formula is 1-f = ......

A) 1-u - 1-v B) u + v C) u - v D) 1-u + 1-v

3. We get a diminished image with a concave mirror when the object is placed.....

A) at F B) between the pole and F

C) at C D) Beyond C

4. When parallel rays are incident on a concave mirror, on reflection, they meet at.....

A) Pole B) Centre of curvature

C) focus D) Beyond C

5. A light ray travelling in the direction of the centre of curvature will on reflection on a convex mirror, travel in opposite direction and appears to be coming from .........

A) Focus B) Pole C) Centre of curvature D) Any point

6. The colour of methyl orange indicator in acid medium is ..........

A) Yellow B) Green C) Orange D) Red

7. A solution turns red litmus blue, its pH is likely to be ..........

A) 1 B) 4 C) 5 D) 10

8. ......... is produced by the action of chlorine on dry slaked lime.

A) Baking soda B) Bleaching powder

C) Washing soda D) CaCl2

9. The mixture of baking soda and tartaric acid is....

A) Bleaching powder B) Washing soda

C) Quicklime D) Baking powder

10. The Calcium Sulphate hemihydrate is .....

A) Plaster of Paris B) Bleaching powder

C) Washing soda D) Soda ash

11. Water molecules present in hydrated copper sulphate is......

A) 2 B) 10 C) 5 D) 7

12. Washing soda is used in the manufacture of....

A) Baking powder B) Chlorine C) Sodium D) Borax

13. This is a mild non-corrosive base.....

A) NaOH B) KOH C) NH4OH D) NaHCO3

14. This is mined like coal.....

A) Washing soda B) Table salt C) Rock salt D) Salt cake

15. ......... introduced the concept of pH.

A) Soren Sen B) Pauling C) Friedrich D) Powell

16. Our stomach produces ....... acid.

A) Nitric acid B) Sulphuric acid

C) Hydrochloric acid D) Acetic acid

17. Tooth decay starts when pH of the mouth is...

A) 5.0 B) 6.0 C) 7.0 D) 9.0

18. When pH of rain water is less than ......, it is called acid rain.

A) 6.6 B) 7.6 C) 8.0 D) 5.6

19. Milk of magnesia is .......

A) Ca(OH)2 B) NH4OH C) Mg(OH)2 D) KOH

20. These neutralise the excess acid in our stomach........

A) acids B) antacids C) alkalies D) bases

21. This is a mixture of several indicators.

A) Universal indicator B) Olfactory indicators

C) Natural indicators D) Synthetic indicators

22. Finely chopped onions are called ............ indicators.

A) Synthetic B) Natural C) Olfactory D) Universal

23. Acids produce ....... ions.

A) OH- B) Cl - C) H+ D) H3 +

24. Acids that give more H3O+ ions are said to be ......... acids.

A) weak B) strong C) neutral D) concentrated

25. This is used as a reagent in the preparation of chloroform....

A) Baking Soda B) Washing Soda

C) Baking Powder D) Bleaching Powder

26. The formula for Gypsum is...

A) CaSO4.2 H2O B) CaSO4 H2O

C) CaSO4. 1-2 H2O D) CaSO4.3H2O

Answers: 

1-A; 2-D; 3-D; 4-C; 5-C; 6-D; 7-D; 8-B; 9-D; 10-A; 11-C; 12-D; 13-D; 14-C; 15-A; 16-C; 17-A; 18-D; 19-C; 20-B; 21-A; 22-C; 23-C; 24-B; 25-D; 26-A.

10th Class Bit Bank - Physical Science Multiple Choice Questions

1. N2 + O2 .. 2NO - Q. This is a ...... reaction.

A) Reduction B) Displacement

C) Endothermic D) Exothermic Sunlight 

2. 2 AgCl .... 2 Ag + Cl2.

This is a ........ reaction.

A) Exothermic B) Displacement

C) Photo Chemical D) Double displacement

3. Rancidity can be prevented by adding....

A) Antioxidants B) Oxides

C) Vitamins D) Potato chips

4. Bleaching of coloured objects is done with...

A) Bleaching powder B) moist Chlorine

C) Washing soda D) All the above

5. The method of protecting iron from rusting by coating them a thin layer of Zinc is called.....

A) Alloying B) Galvanizing C) Colouring D) Painting

6. Oxidation means addition of .....

A) Hydrogen B) Oxygen

C) Heat D) an anti oxidant

7. C + O2 .. CO2 + Q. This reaction is called....

A) a chemical reaction

B) Exothermic reaction

C) Photo chemical reaction

D) Endothermic reaction

8. Corrosion can be prevented by....

A) greasing B) painting

C) galvanizing D) All the above

9. Rusting of iron is an example for ....

A) Oxidation B) Reduction

C) Rancidation D) Electrolysis

10. The chemical formula for marble is....

A) CaO B) CaCOHs2

C) CaCO3 D) CaCl2

11. This gas is used as cooking fuel ......

A) Coal B) Propane C) CO2 D) Hydrogen

12. 2.0 gm. of Hydrogen at S.T.P. occupies a volume of ........

A) 2 litres B) 2.24 litres

C) 22.4 litres D) 224 litres

13. When lime stone is heated this gas is released .....

A) Hydrogen B) Oxygen

C) Nitrogen D) Carbon Dioxide

1. The colour of Silver bromide is.....

A) Yellow B) Red C) Light Yellow D) Blue

15. Na2SO4(aq) + BaCl2 (aq) .. BaSO4 (s) + 2 NaCl (aq)

This is an example for ........ reaction.

A) combination B) double displacement

C) displacement D) decomposition heat

16. CuO (s) + H2 (g) .. Cu (s) + H2O (g) is an example for ........ reaction.

A) Oxidation B) Reduction C) Decomposition D) Redox

17. Potatoes contain this enzyme ....

A) Tyrosinase B) Saliva C) Zymogen D) Lactase

18. This is a skeleton equation

A) AgNO3 + NaCl .. AgCl + NaNO3

B) Zn + 2 HCl .. ZnCl2 + H2

C) C3H8 + O2 .. CO2 + H2O

D) C + O2 .. CO2

19. The mirror which is bent inwards is known as .......... mirror.

A) Concave B) Convex C) Plane D) Magic

20. ...... burned ships using mirrors.

A) Fermat B) Archimedes C) Lewis D) Newton

21. Magnification m = ........

A) u.v B) v. u C) .hi ho D) h.o hi

22. Image and object will be of the same size, if the object is placed at ........ of a concave mirror.

A) focus (F) B) between F and C

C) Beyond C D) At C

23. This mirror is used as a rear view mirror in vehicles.

A) Convex mirror B) Concave mirror

C) Plane mirror D) Parabolic mirror

24. ENT specialists use this mirror.....

A) Convex mirror B) Plane mirror

C) Concave mirror D) Parabolic mirror

25. This image cannot be caught on a screen....

A) real image B) inverted image

C) enlarged image D) virtual image

26. This is used as a shaving mirror....

A) Concave mirror B) Convex mirror

C) Plane mirror D) Parabolic mirror

27. The mid point of a spherical mirror is called ............ of the mirror.

A) Focus B) Pole

C) Centre of curvature D) Principal axis

28. The image in this mirror suffers lateral inversion....

A) Concave mirror B) Convex mirror

C) Plane mirror D) Parabolic mirror

Answers:

1-C; 2-C; 3-A; 4-B; 5-B; 6-B; 7-B; 8-D; 9-A; 10-C; ; 11-B; 12-C; 13-D; 14-C; 15-B; 16-D; 17-A; 18-C; 19-A; 20-B; 21-C; 22-D; 23-A; 24-C; 25-D; 26-A; 27-B; 28-C.