dimple

Nitrogen is made up of two isotopes, 14-N and 15-N. Given the nitrogen’s atomic weight of 14.007, what is the percent abundance of each isotope?

Copper is made up of two isotopes, Cu−63 (62.9296amu) and Cu−65 (64.9278amu). Given copper’s atomic weight of 63.546, what is the percent abundance of each isotopes?

Which of the following pairs of species would generate a salt derived from a weak acid and a weak base?

HCl and NaOH

HF and CH3NH2

H2S and Ca(OH)2

HNO3 and KF

Why stars shine?

What is short circuit?

Who is father of science?

How much does the Earth weigh?

What is cosmology?

What is casimir effect?

What is quantum energy?

ecological pyramid means

What is afforestation?

What are the types of biomass?

What are fuel cells?

What is geothermal energy?

What is the best renewable energy source?

Explain the process of biogas production

What is meant by combustion?

explain the three types of heat transfer

What is the effect of temperature on elasticity?

What is meant by elasticity?

1. Radiocarbon is produced in the atmosphere as a result of

A. collision between fast neutrons and nitrogen nuclei present in the atmosphere

B. action of ultraviolet light from the sun on atmospheric oxygen

C. action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere

D. lightning discharge in atmosphere

3.  The absorption of ink by blotting paper involves

A. viscosity of ink

B. capillary action phenomenon

C. diffusion of ink through the blotting

D. siphon action

Nuclear sizes are expressed in a unit named

A. Fermi

B. angstrom

C. newton

D. tesla

Which of the following is not a metallic mineral?

(A) Gypsum

(B) Limonite

(C) Bauxite

(D) Haematite

Blue vitriol is

(A) Sodium sulphate

(B) Iron sulphate

(C) Calcium sulphate

(D) Copper sulphate

Tear gas is

(A) Ammonia

(B) Hydrogen sulphide

(C) Chlorine

(D) Hydrogen chloride

Glass is made from the mixture of

(A) Quartz and mica

(B) Sand and salt

(C) Sand and silicates

(D) None of these

The law of Octaves is due to

(A) Mendeleev

(B) Lother Mayer

(C) Dobereiner

(D) Newlands

Salts of which of the following elements provide colours to fireworks?

(A) Chromium and nickel

(B) Strontiurn and barium

(C) Potassium and mercury

(D) Zinc and sulphur

In which type of rocks are metals like Gold and Copper mostly found?

(A) New metamorphic

(B) Old metamorphic

(C) Old sedimentary

(D) Old igneous

In coloured glass. the purple colour is imparted by

(A) Manganese oxide

(B) Cadmium sulphide

(C) Ferric oxide

(D) Selenium sulphide

The vinegar is a solution of

(A) 5% acetic acid in water

(B) 10% acetic acid in water

(C) 15% acetic acid in water

(D) 50% acetic acid in water

Which chemical was used earlier for giving anesthesia to patients?

Which heavy metal causes Itai Itai disease?

1. The concept of gravity was discovered by which famous physicist?

1. Roughly how long does it take for the sun's light to reach Earth - 8 minutes, 8 hours or 8 days?

Nacl which bond takes place 

Number of amino acid in human body?