Which one of these statements is true for ALL electromagnetic waves?

What would be the best materials to use for making the coil and the core of an electromagnet?

In the reactivity series of metals the order is: sodium, calcium, magnesium, aluminium, which means that the most reactive metal is:

Instructions: Choose the one NEAREST in MEANING to the original sentence.

The news shocked me so much that I almost forgot what I wanted to say.

Which one of the following is NOT a harmful effect of smoking?

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

Despite his short-temper, his willingness to give of his wealth to help others to succeed led people to call him ............

Who presides over the House of Assembly / House of Representatives?

What is the simple interest earned on $10 000 invested for 3 months at a rate of 5% per annum?

All gas exchange surfaces in vertebrate animals have:

At the cathode all of these can happen EXCEPT for:

Reactive metals such as potassium react with water to give hydrogen and:

Personal accounts are found in the

Proteins are:

Hydrochloric acid forms salts called:

Tooth decay can be caused by:

Some plants reproduce by forming bulbs. The new plants that grow from the bulbs will be genetically identical
because:

Choose the ONE underlined part A, B or C that is inappropriate. If the sentence is acceptable as it stands, choose D.

The problem with the students is that they arrive late, gives no excuse, and are rude when spoken to.

The non-metal used to make margarine is:

A political campaign is a method used by political parties to

You look through a microscope to view the Brownian motion of smoke in a container of air. Which one of the following statements is NOT true?