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The first thermionic valve was invented by

The vitamins which is generally excreted in urine is

Which among the given is a metallic ore -

Which of the following one of the following nonmetals shows allotropy in the liquid state

A piece of wood is held under water. The upthrust on it will be:

DNA nucleotides are attached by

In the eye donation, which part of the eye is transplanted from the donor?

Plants differ from animals in having

The focal length of convex lens is

The waste management technique that involves the use of microorganisms to remove or neutralize pollutants from contaminated site is called

Which among the given is a method/process of disposing of solid waste which cannot be reused or recycled

Which of the following one of the following organic compound is used to remove stains of iron compounds

A plane glass slab is kept over coloured letters which appears least raised is

In the healthy human eye , the focusing is done by the

Plants get water through the roots as of-

The water from a hand pump is warm in winter as

Which among the given is a monoatomic gas

Which of the following one of the following reflects back more sunlight as compared to other three

A plane mirror always produces a

In the nuclear reactor, heavy water (D2O) is used in the form is

Which among the given is a monogenetic parasite -

Which of the following one of the following vegetable oils is used in the manufacture of paints

A plant with compound leaves is

Drinking soda is

In the process of magnetisation of a bar