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Read the given statements and select the correct option.
Statement 1 : Combustion is a chemical process in which a substance reacts with oxygen to give off heat and at times light.
Statement 2 : Heat and light produced in sun are due to combustion

ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true and statement 2 is false.
DBoth statements 1 and 2 are false.

A student carried out an experiment in the lab by taking sample X in a test tube. He added 2-3 drops of phenolphthalein to it but no change in colour was observed. To this sample excess of a compound Y was added dropwise and the solution was stirred. As a result the solution turned pink. Sample Y has taste (sour/bitter) just like the taste of ______.

ATamarind
BVinegar
CLemon juice
DMilk of magnesia

P and Q are two non-metals. If the ratio of number of P atoms to the total number of atoms in its oxide is 0.33 and that for Q is 0.25 then, the valencies of P and Q are respectively

A 2 and 3
B 3 and 6
C 1 and 2
D 4 and 6.

Which of the following waves does not travel in vacuum?

ASeismic waves
B X-rays
C Light
D Radio waves

Refer to the given relationship based on body coverings and select the option which satisfies the same relationship.


APenguin : Shark : Kingfisher
BTuna : Reindeer : Arctic tern
CMink : Sardine : Penguin
DYak : Bat : Frog

Select the incorrect statement regarding the given figure.



AThe part labelled P produces both male gametes and androgen.
BThe sperms collect and mature in Q.
CThe parts R and S have no role in reproduction.
DThe part T is located outside the abdominal cavity and protects P and Q inside it.

Study the given Venn diagram. X is likely to be _______.



AA group of people smoking cigarettes
BYoungsters dancing in a disco
CA farmer spraying pesticides near a river
DConstruction work going on at a building site

Three different types of plants X, Y and Z, were selected by scientists who want to document their methods of seed dispersal. The graphs below show the approximate number of seedlings found at various distances around the parent plant.

Which option most correctly lists the methods of seed dispersal of each plant?

AX- Water; Y- Explosive action; Z-Animal
BX- Wind; Y- Animal; Z-Water
CX- Wind; Y-Animal; Z-Explosion
DX- Explosion; Y- Water; Z-Animal

Which of the following statements is/are correct?
I. Thermometer is read by holding its bulb.
II. A few sharp jerks are given to clinical thermometer before using it.
III. Black fabric is preferred during winter.
IV. Shopkeepers selling ice blocks usually cover them with jute sacks.

AI only
BII and III only
CIII and IV only
DII, III and IV only