Question

Which of the following is an endothermic process?
Dilution of sulphuric acid
Sublimation of dry ice
Condensation of water vapours
Respiration in human beings
2. What type of chemical reactions take place when electricity is passed through water?
Displacement
Combination
Decomposition
Double displacement
3. The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called:
corrosion
antioxidation
rancidity
reduction
4. Which information is not conveyed by a balanced chemical equation?
Physical states of reactants and products
Symbols and formulae of all the substances involved in a particular reaction
Number of atoms/molecules of the reactants and products formed
Whether a particular reaction is actually feasible or not
5. The reaction in which two compounds exchange their ions to form two new compounds is called :
displacement reaction
double displacement reaction
redox reaction
combination reaction
6. We store silver chloride in a dark coloured bottle because it is :
a white solid
undergoes evaporation
to avoid action by sunlight
none of the above
7. The reaction of hydrogen gas with oxygen gas to form water is an example of :
combination reaction
redox reaction
exothermic reaction
all of these reactions
8. Name a mirror that can give an erect and enlarged image of an object.
plane mirror
concave mirror
convex mirror
all the above
9. A spherical mirror produces an image of magnification -1 on a screen placed at a distance of 50cm from the mirror. What is the focal length of the mirror?
+25cm
+50 cm
-25cm
-50cm
10. Light enters from air to glass having refractive index 1.5. What is the speed of light in the glass?(speed of light in vacuum is 3x10^8 m/s)
2x10^8 m/s
3x10^8 m/s
2x10^-8 m/s
3x10^-8 m/s
11.Power of a lens is 4 Dioptre. What is it's focal length in cm ?
0.25
0.0025
2.5
25
12.Which of the following lenses would you prefer to read small letters found in a dictionary?
A convex lens of short focal length
A concave lens of short focal length
A concave lens of large focal length
A convex lens of large focal length
13. Among the list given below, which is converging?
convex lens and convex mirror
cocave lens and concave mirror
convex lens and concave mirror
concave lens and convex mirror
14.The mode of nutrition found in fungi is:
Parasitic nutrition
Holozoic nutrition
Autotrophic nutrition
Saprotrophic nutrition
15.Which region of the alimentary canal absorbs the digested food?
Stomach
Small intestine
Large intestine
Liver
16.The site of photosynthesis in the cells of a leaf is
chloroplast
mitochondria
cytoplasm
protoplasm
17.The inner lining of the stomach is protected by one of the following from hydrochloric acid. Choose the correct one -
Mucus
Salivary amylase
Pepsin
Bile
18.Which is the correct sequence -
mouth → stomach → small intestine → oesophagus → large intestine
mouth → oesophagus → stomach → large intestine → small intestine
mouth → stomach → oesophagus → small intestine → large intestine
mouth → oesophagus → stomach → small intestine → large intestine
19.The enzymes pepsin and trypsin are secreted respectively by
Stomach and pancreas
Salivary gland and stomach
Liver and pancreas
Liver and salivary gland
20.Which of the following equations is the summary of photosynthesis?
6CO2 + 12H2O → C6H12O6 + 6O2 + 6H2O
6CO2 + H2O + Sunlight → C6H12O6 + O2 + 6H2O
6CO2 + 12H2O + Chlorophyll + Sunlight → C6H12O6 + 6O2 + 6H2O
6CO2 + 12H2O + Chlorophyll + Sunlight → C6H12O6 + 6CO2 + 6H2O
Answers
Sublimation of dry ice
Decomposition(electric)
rancidity
Whether a particular reaction is actually feasible or not
double displacement reaction
to avoid action by sunlight
7th one not sure
concave mirror
-25cm
2x10^8 m/s
25
A convex lens of short focal length
convex lens and concave mirror
Saprotrophic nutrition
Small intestine
chloroplast
Mucus
mouth → oesophagus → stomach → small intestine → large intestine
Stomach and pancreas
6CO2 + 12H2O + Chlorophyll + Sunlight → C6H12O6 + 6O2 + 6H2O

Answer 1

Answer:

2 decomposition

8 concave mirror