science for 3 grade

A body of mass 50 kg has a momentum of 225 kgm/s. Calculate the velocity of the bod..

Which of the following two nuclei are isotopes of each other..

Question: A copper plate was dipped in AgNO 3 solution. After certain time silver from the solution was deposited on the copper plate. State the reason why it happened. Give the chemical equation of the reaction involved. Answer: Copper is more reactive than silver, therefore, ..

Question: Identify the micro-organism. Give 2 symptoms exhibited by a person suffering from the disease. Answer: It is Myobacterium tuberculosis. Symptoms: Loss of apetite and weight Typical fever pattern and night sweats..

Question: _____ of stratosphere provides protection to our life. 1. Nitrogen 2. Hydrogen 3. Ozone 4. Argon Answer: 3..

Question: A weak acid in solution is ___________. 1. mostly molecules 2. mostly ions 3. both molecules and ions 4. less water Answer: 3..

Question: The property of catenation is more marked in case of _________. 1. silicon 2. hydrogen 3. oxygen 4. carbon Answer: ..

Question: Which of these is homozygous recessive? 1. Ss 2. ss 3. SS 4. s Answer: ..

Question: Organisms that synthesise their own food are called _________________. 1. green plants 2. sulphur bacteria 3. autotrophs 4. purple-sulphur bacteria Answer: 3..

Question: The quantity of matter present in an object is called its _________. 1. Mass 2. Volume 3. Density 4. Vapour pressure Answer: ..