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Which of the following statements is true about prime numbers?

A There are finite number of prime numbers.
B Every prime number is odd.
C There is no largest prime number.
D A whole number is either prime or it can be expressed as a product of primes.

Identify W, X, Y and Z.
W : An edible liquid miscible in water
X : A non-edible, inflammable liquid that floats on water
Y : An edible, coloured liquid that does not flow easily
Z : A colourless, non-inflammable liquid

Which of the following is not a behavioural adaptation?

AA hognose snake plays dead when it feels threatened.
BA Siberian crane migrates from West Siberia to India to escape extreme cold.
CWestern swamp turtle aestivates to escape excessive hot condition.
DLeaf insect mimics/resembles a green or a dry leaf to escape its predators.

Consider the following statements and select the correct option which correctly identifies true (T) and false (F).
(i) Iron loses its magnetism easily.
(ii) Steel is a hard magnetic material.
(iii) Iron is used to make permanent magnet.
(iv) Steel is used to make electromagnet.

Read the given statements and select the correct option.
Statement 1 : A pendulum can vibrate in an artificial satellite.
Statement 2 : Inside the satellite, acceleration due to gravity is zero.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Statement 1 is false but statement 2 is true.

Select the option which correctly fills the boxes X and Y of the given flow chart.

Which of the following is the best method of purification of muddy water?

A
B
C
D None of these

Study the given flow chart and select the option which correctly identifies P, Q, R and S.

Which of the following statements are correct?
(i) Wheels of a car moving at a constant speed undergo linear, rotational as well as periodic motion.
(ii) A hockey player running after the ball during a match undergoes linear and periodic motion.
(iii) The pendulum of a clock undergoes periodic and oscillatory motion.

A(i) and (ii) only
B(ii) and (iii) only
C(i) and (iii) only
D(i), (ii) and (iii)

The given picture shows 7 dice. Find the total number of dots that are seen in this picture.



A21
B43
C104
D147