Molecules with identical molecular formulae but with different structural formulae are called
A. Isotopes B. Isomers C. Electrode D. Compound
The most abundant element in the earth’s crust is oxygen. The second most abundant element in the earth’s crust is
A. Hydrogen B. Nitrogen C. Brass D. Silicon
A person seated in front of a fire receives heat by
A. Conduction B. Convection C. Radiation D. None of these
If we heat one end of metallic rod, the other end gets hot. The method of heat transfer is
A. Conduction B. Convection C. Radiation D. None of these
Which from the following is NOT a method of heat transfer?
A. Conduction B. Convection C. Radiation D. All are methods of heat transfer
The device used to measure movements of the heart is
A. Cardiograph B. Seismograph C. Hydrometer D. Hygrometer