The following are all minerals EXCEPT for:
The optimum pH for most enzyme action is:
Profits in the partnership of Bess, Bill and Bob are shared in the ratio 1 : 2 : 3. If Bill's share of the profits is $300, what is Bob's share?
The aim of the experiment shown above was to find out if:
The standard atom used for mass calculations is:
1 mole of gas occupies 24 litres at room temperature and pressure, so the number of moles in
72 litres is:
The following statements describe a magnetic field plot, showing the lines of force.Which one is true?
To complete the reaction: acid + carbonate → salt + carbon dioxide + ?, we must add the word:
Which of the following acronyms represents a computer bus primarily designed for the transfer of data between a computer system and a mass storage device?
A 10 V battery delivers a steady current of 2 A. How long will it be before 1.0 kJ of energy is supplied to the circuit?
If p * q = pq2 , then 2 * 3 =
January 1, 1999 a trader bought 100 articles at $5.00 each. During the month 70 Of the articles were sold at $8.00 each and the remainder were sold on January at the market value of $3.00 each. What was the gross for the month?
The common name for silicon dioxide is:
The alkane compound with seven carbon atoms is:
Crossing two brown mice produced an offspring with a black coat.Which of the following statements MUST be correct?
Ⅰ Brown coat is dominant to black.
Ⅱ The brown mice were heterozygous for coat colour.
Ⅲ The black mouse was homozygous for coat colour.
Ⅳ Crossing a black mouse with another black mouse could produce a brown offspring.
All of the following can affect the size of a population EXCEPT for:
The specific heat capacity of a particular liquid is 3000 J kg-1 K-1. A large beaker containing 2 kg of the liquid has to be warmed from 25 ℃ to 35 ℃. A 100 W heater is used. If all the thermal energy could be transferred to the liquid, how long would it take?
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.
In the circle above, the circumference is 20
cm. The length of the arc AB, in centimetres,
is
Which one of the following chemicals is used to test for starch?