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Q:

Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in

A) Conduction B) Convection
C) Radiation D) Both conduction and convection
 
Answer & Explanation Answer: B) Convection

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Q:

Isotones have always ______

A) Same number of protons B) Same atomic number
C) Same number of neutron D) Same number of proton and same numbe of neutron
 
Answer & Explanation Answer: C) Same number of neutron

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Q:

The oceanic crust mainly consists of silica and __________.

A) magnesium B) iron
C) manganese D) sulphur
 
Answer & Explanation Answer: A) magnesium

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Q:

Which   one   of   the   following   is   not   a semiconductor?

A) Silicon B) Germanium
C) Quartz D) Gallium arsenide
 
Answer & Explanation Answer: C) Quartz

Explanation:

Semiconductors are the basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc. 2. Lattice structure and the atomic structure of constituent elements decide whether a particular material will be insulator, metal or semiconductor. Semiconductors are elemental (Si, Ge) as well as compound (GaAs, CdS, etc.). Silicon, Germanium, Gallium Arsenide are semiconductors, but Quartz is an insulator.

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Q:

The strongest interactions between molecules of hydrogen chloride are

A) dipole-dipole interactions B) hydrogen bonds
C) covalent bonds D) ionic bonds
 
Answer & Explanation Answer: A) dipole-dipole interactions

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Q:

The volume of 10 g of gas X is 5.6 litre at NTP. What is the molecular weight of X?

A) 40 B) 60
C) 50 D) 20
 
Answer & Explanation Answer: A) 40

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Q:

Chemical formula for sulphurous acid is:

A) H2SO4 B) H2SO3
C) H3SO3 D) H3SO4
 
Answer & Explanation Answer: B) H2SO3

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Q:

Activated Charcoal is used to remove colouring matter from pure substances by_______

A) Bleaching B) Oxidation
C) Adsorption D) Reduction
 
Answer & Explanation Answer: C) Adsorption

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