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When a soft drink bottle is opened, there is sudden occurrence of effervescences. Why?

AGas moves from low atmospheric pressure to high atmospheric pressure
BThere is pressure difference inside and outside
CIt is a tendency of CO₂ gas to expand
DAll of these

Select the odd one out.

A

B

C

D

Select a figure from the options which will replace the (?) to form the series as established by the Problem Figures.


A
B
C
D

Read the given conversation.



Which of the these statements is correct?

AX is ruby and Z is tungsten.
BY is granite and Z is quartz.
CX is diamond and Y is silica.
DY is graphite and Z is tungsten.

The region of the Earth near the __________ receives almost the same amount of sunlight through out the year. This region always remains hot and has days and night of equal duration. On the other hand the __________ receive(s) sunlight only for six months and remain(s) dark for the next six months.
Select the correct sequence of words to fill the blanks in the above given passage.
(a) Northern hemisphere, Southern hemisphere
(b) Southern hemisphere, Northern hemisphere
(c) Equator, Poles
(d) Axis, Equator

Match column I with column II and select the correct option.


Aa - 2 , b - 4 , c - 3 , d - 1
Ba - 1 , b - 3 , c - 4 , d - 2
Ca - 4 , b - 3 , c - 1 , d - 2
Da - 1 , b - 4 , c - 3 , d - 2

Which of the following diagrams correctly shows the movement of water in the plant?
(a)
(b)
(c)
(d)

A scientist took a metal rod and a wooden rod and wrapped each of them in a piece of paper. These were then heated as shown. It was found that the paper around the metal rod does not burn whereas the one around the wooden rod catches fire. It is because


AMetal being a good conductor, conducts away heat given to paper
BWood being an insulator, takes away all the heat
CCandle in case of iron rod, is near to the paper
DNone of these.

What is common among the following phenomena?
1. Planetary motion
2. Blinking of traffic lights
3. Motion of rotating fan blades
4. Swinging of a pendulum

AThey are all chemical changes.
BThey are all periodic changes.
CThey are all undesirable changes.
DThey are all physical changes.