science 12 grade

Question: 1. 1.25 2. 15 3. 14 4. 12 Answer: ..

Calculate the percentage by weight of potassium in potassium dichroma..

Question: The 'Scavengers' or 'Digestive bags' of a cell are ____. 1. chromosomes 2. centrosomes 3. lysosomes 4. ribosomes Answer: ..

Question: Developing embryo from a superior breed is transferred into the uterus of a female with inferior characteristics by the process of 1. hybridization 2. artificial insemination 3. embryo transfer 4. random mating Answer: ..

Question: A solid that sublimes on heating is _________. 1. sodium chloride 2. copper sulphate 3. lead sulphate 4. ammonium chloride Answer: ..

Question: The death of the last individual of a species is called_______. 1. extinction 2. clad 3. neither (a) nor (b) 4. species diversity Answer: ..

Question: Mass number is equal to the_________. 1. number of protons + number of electrons 2. number of protons + number of neutrons 3. number of neutrons + number of electrons 4. number of electrons Answer: ..

Question: A chronic case of a disease denotes_________. 1. severe attack of the disease 2. mild attack of the disease 3. disease occurs for a very long period 4. all of the above Answer: ..

Question: Choose the acid salt from the following: 1. NaNO 3 2. Na 2 SO 4 3. NaHSO 4 4. Na 2 CO 3 Answer: ..

Question: The correct formula for ammonium sulphate is __________. 1. NH 4 SO 4 2. (NH 4 ) 2 SO 4 3. (NH 3 ) 2 SO 4 4. (NH 4 ) 2 (SO 4 ) 2 Answer: ..