Light waves are

• electro-mechanical waves

• electro-magnetic waves

• electro-optical waves

• magneto-optical waves

A sample of carbon dioxide that undergoes a transformation from solid to liquid and then to gas would undergo

• a change in mass

• a change in density

• a change in composition

• no change in physical properties

Which one of the following pairs of power projects is not correctly matched?

• Papanasam - Hydropower

• Neyveli - Hydropower

• Ukai - Thermal power

• Rana Pratap Sagar - Hydropower

A particle is moving in a circular path of radius r at a constant speed v. Which one of the following graphs correctly represents its acceleration a?

Which of the following element combinations will form ionic compounds?

1. Ca (Z= 20) and Ti (Z = 22)
2. Si (Z= 14) and Br (Z= 35)
3. Mg (Z = 12) and Cl (Z = 17)

Select the correct answer using the code given below.

• 2 only

• 3 only

• 2 and 3 only

• 1, 2 and 3

In the term GIS, 'G' stands for

• Global

• Geographic

• Goodness

• Geological

A thermodynamic process where no heat is exchanged with the surroundings is

• isothermal

• adiabatic

• isobaric

• isotropic

A compound X₂O₃ contains 31.58% oxygen by weight. The atomic mass of X is

• 34.66 g mo1^-1

• 45.01 g mo1^-1

• 52.00 g mo1^-1

• 104.00 g mo1^-1

Which one of the following is the correct sequence of oil refineries in India in respect of their time of establishment (starting from the earliest)?

• Barauni - Haldia - Guwahati - Mathura

• Barauni - Mathura - Guwahati - Haldia

• Guwahati - Haldia - Mathura - Barauni

• Guwahati - Barauni - Haldia - Mathura

Which one of the following circuit elements active component?

• Resistor

• Transistor

• Inductor

• Capacitor