nj ask grade 8 science

Question: How many gram atoms are present in 69 grams of sodium? Answer: The number of gram atoms present in 69 grams of sodium is ..

Question: What is the wavelength of sound waves produced in air by a vibrating tuning fork whose frequency is 256 Hz when the velocity of sound in air is 330 m s - 1 ? Answer: v = f 330 = 256 = = 1.3 ..

Question: What are functional groups? write the functional groups of: 1) acids 2) aldehydes. Answer: The functional group is an atom, or a group of atoms which can replace one or more hydrogen in a hydrocarbon. This group when present in organic compounds defines the characteristic physi..

Question: In the figure, 1. 6 W , 3 W and 9 W are in series 2. 9 W and 6 W are in parallel and the combination is in series with 3 W 3. 3 W , 6 W and W are in parallel 4. 3 W , 6 W are in parallel and 9 W is in series Answer: ..

Question: Why are some forests known as biodiversity hot spots? Answer: Forests where a large number of flora and fauna species are found are termed as 'biodiversity hot spots'. The range of different life forms like bacteria, fungi, ferns, flowering plants, nematodes, insects, birds, re..

Question: Which of the following causes the least pollution when burnt? 1. Petrol 2. Diesel 3. Coal 4. Natural gas Answer: ..

Question: The molecular formula of potassium nitrate is ________. 1. KNO 2. KNO 3 3. KNO 2 4. KON Answer: ..

Question: In phylum Aschelminthes, the alimentary canal is 1. complete 2. incomplete 3. not present 4. none of the above Answer: ..

Question: The S.I. unit of force is 1. erg 2. joule 3. newton 4. dyne Answer: ..

Question: Vacuoles (in plant cells) _____. 1. produce energy for the cell 2. synthesize proteins 3. defend the cell 4. provide turgidity and rigidity to plant cells Answer:4 ..