Q2.According to Newton's third law of motion, the action and reaction forces are
Answer : Option AExplaination / Solution:
When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.To every action there is always opposed an equal reaction or the mutual actions of two bodies upon each other are always equal and opposite in direction.
Q3.Read the following statements about muscle contraction in humans :
i. chemical energy is converted into mechanical energy during muscle contraction and the chemical is a neurotransmitter. ii. a neurotransmitter acetylcholine at motor end plate converts electrical energy into mechanical energy. iii. in a contracted muscle, volume remains the same. iv. a contracted muscle becomes shorter and thicker.
Answer : Option AExplaination / Solution:
The chemical energy is converted into mechanical energy during muscle contraction and the chemical is a neurotransmitter. In a contracted muscle, volume remains the same and a contracted muscle becomes shorter and thicker.
Answer : Option DExplaination / Solution:
An enzyme-linked immunosorbent assay, also called ELISA or EIA, is a test that detects and measures antibodies in your blood. This test can be used to determine if you have antibodies related to certain infectious conditions. It is used to detected the disease at early stage.
Q5.All combustion reactions, which make use of elemental dioxygen, as well as other reactions involving elements other than dioxygen are:
Answer : Option BExplaination / Solution:
A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product). Such reactions may be represented by equations of the following form: X + Y → XY.
Answer : Option BExplaination / Solution:
RCH stands for reproductive and child health care. RCH deals with all problems related to healthy reproductive life, problems related to care during pregnancy and care of child after the birth with their immunization programme.
The general electronic configuration of ns2 exit in:
Answer : Option AExplaination / Solution: The general electronic configuration ofns2exists in alkaline earth metals as their outer most electron enter the S orbital and they have only two electrons in their valence shell