When an element combines with oxygen we get an:

You never find native magnesium because:

The splitting of a beam of white light into the colours which make it up is called:

All of the following are features of a gas exchange surface EXCEPT for:

AIDS is a killer disease because:

In the figure above, AB || CD and ∠BAD = 32° . ∠APC =

After a 5% discount, an article is sold for $475. The price before the discount was

Which of the following transactions should be debited in the Cash Account?

Instruction: Choose from the four options the word or pair of words which BEST completes the meaning of the sentence.

While the committee members ............ insults across the floor, the chairman tried in vain to ............ order.

All of these are ordered crystalline structures EXCEPT for:

The biceps and triceps are an antagonistic pair of muscles because:

The decimal equivalent of ³/₈ is

The gas that relights a glowing splint is:

All of the following are non-metals EXCEPT for:

Instruction: Choose from the four options the word or pair of words which BEST completes the meaning of the sentence.

To conceal his true activities, the spy quickly ............ a plausible excuse for his presence there.

A species of mouse has 32 chromosomes in its muscle cells.What will be the numbers of chromosomes in the mouse′s skin cells and sperm cells?

The expression (3x - 2)(x + 1) =

Which of the following are advantages of asexual reproduction in a flowering plant?
Ⅰ Large numbers of offspring are rapidly produced.
Ⅱ Favourable genotypes are maintained from one generation to the next.
Ⅲ The plant does not need to rely on wind or insects for pollination.
Ⅳ Several identical individuals grow close together.

An electron, with its charge of 1.6 × 10^-19 C, is moved from one place at +8 V to a different place which is at 0 V.The energy released will be: