Science and mathematics

How many atoms of sodium (Na) are in one molecule of baking soda?

• 1

• 2

• 3

• 4

Molecules bonded together make up atoms.

• true

• false

What did the second man drink?

• Arsenic

• Hydrogen Peroxide

• Helium Oxolate

A catalyst  

• is added to a reaction to make it slow down 
• breaks apart and is changed 
• provides an energetic short cut to the products 

If oxidation is occuring what happens to the metal

• Resting

• It's making a new substance

• It's dissolving

• Rusting

Planets do not twinkle because

• they emit light of a constant intensity
• Their distance from the earth does not change the  time
• They are very far away from the earth resulting in decrease in intensity of light
• They are nearer to earth and hemce we recieve a greater amount of light and, therefore minor variations in the intensity are not noticeable

Light from the sun reaches us in nearly

• 2 minutes
• 4 minutes
• 8 minutes
• 16 minutes

Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to

• The heating effect of current alone
• Hysteresis loss alone
• both the heating effect of current and hysteresis loss
• intense sunlight at noon

The absorption of ink by blotting paper involves 

• Viscosity of ink
• Capillary action phenomenon
• Diffusion of ink through the blotting
• Siphon action

Which of these is a unit of work?

• Watt
• Meter
• Joule
• Newton