The location and energy of an electron in an atom can be specified by?
Answer: A
The position and energy of an electron in an atom are specified by its four quantum numbers.
The principal number n gives the shell and the main energy, l the shape of the orbital, m its orientation, and s the electron's spin. No two electrons in an atom may have all four the same.
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What is the number of periods in which Periodic table is divided?
Answer: B
The periodic table has 7 periods - the horizontal rows.
The period number gives the number of electron shells an atom of that element has. The rows lengthen down the table, from two elements in period 1 to thirty-two in periods 6 and 7.
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The study of the system of the animal body which protects it from infection by various diseases is called
Answer: B
Immunology is the study of the immune system - the body's defences against infection, and the disorders that arise when they fail or attack the body itself.
Microbiology studies the organisms that cause infection, pathology the changes disease produces in tissue, and haematology the blood.
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What invisible force holds you onto the earth, so that you don't simply fall off?
Answer: A
Gravity holds you to the earth - the mutual attraction between any two masses.
At the surface it gives everything an acceleration of about 9.8 m/s² towards the centre, and your weight is simply that acceleration multiplied by your mass.
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Device which measure magnitude and direction of magnetic fields is known as
Answer: D
A fluxgate magnetometer measures both the magnitude and the direction of a magnetic field.
It works by driving a core into saturation with an alternating current; any external field makes the saturation asymmetric, and the asymmetry gives the field component along the axis. Three orthogonal sensors give the full vector.
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The combustible material at the tip of a safety match stick is?
Answer: C
The head of a safety match contains antimony trisulphide as the combustible material, with potassium chlorate as the oxidiser and glue to bind them.
The red phosphorus is on the striking surface of the box; friction converts a trace of it to white phosphorus, which ignites and sets off the head.
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Garampani sanctuary is located at
Answer: A
Garampani sanctuary is near Diphu in Assam, in the Karbi Anglong district.
It is known for its hot springs and waterfalls, and for the hoolock gibbon and golden langur among its wildlife.
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Chlorophyll is a naturally occurring chelate compound in which central metal is
Answer: B
Chlorophyll is a chelate whose central metal is magnesium - a single magnesium atom held in a porphyrin ring.
The arrangement absorbs red and blue light and reflects green. Haemoglobin has the same porphyrin structure with iron at the centre instead, which is why blood is red and leaves are green.
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Which is the smallest flightless bird?
Answer: C
The kiwi of New Zealand is the smallest flightless bird, about the size of a domestic hen at 25 to 45 cm and 1 to 3 kg.
It is also unusual in having nostrils at the tip of its beak and in laying an egg about a fifth of its own body weight.
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Bromine is a
Answer: B
Bromine is a dark red-brown liquid at room temperature, and the only non-metal that is liquid under ordinary conditions.
It gives off a choking red vapour - its name comes from the Greek bromos, stench. Mercury is the only other element liquid at room temperature.
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