Isotopes of a particular elements have the same 

Grafting is a technique in crop production in which a 

When the number of pulleys in the block and tackle system is increased the 

I. Velocity ratio is increased

II. Mechanical advantage is increased

III. Efficiency is decreased

Which of the statements above are correct?

A block and tackle pulley system has three fixed pulleys and two moving ones. Determine the velocity ratio of the system.

Green manure becomes beneficial to soil when 

Given that Avogadro Constant is $$6.02 \times {10^{23}}$$, determine the number of atoms in 0.001 mole of carbon.

One similarity between the lymphatic and blood circulatory system is that they

Which of the following is common to the electric fan, electric bell and the blender?

Which of the following statements about inhaled air exhaled air correct? 

Female secondary sexual characteristics are controlled by

Which of the following substances is excreted by the skin of humans? 

The parts of the eye which are involved in focusing rays of light on the retina are the

Which of the following confirms that light travels in a straight line?

I. Absorption of light

II. Eclipse of the sun

III. Shadow formation

The blinking of the human eye is considered a reflex action because it is