Science.txt

Give the SI unit of resistivity.
a) ohm/metre2  b) ohm metre2  c) ohm metre  d) ohm/metre
The equation → ∑e = ∑IR is applicable to which law?
a) Kirchhoff’s second law  b) Kirchhoff’s junction rule  c) Kirchhoff’s third law  d) Newton’s Law
Which among the following is not attracted by magnets?
a) Iron  b) Cobalt  c) Copper  d) Nickel
Holes are charge carriers in which one of the following?
a) Intrinsic semiconductors  b) Ionic solids  c) n-type semiconductors  d) Metals
At absolute zero, Si acts as which of the following?
a) Non-metal  b) Metal  c) Insulator  d) Capacitor
What is the semiconductor diode used as?
a) Oscillator  b) Amplifier  c) Rectifier  d) Modulator
What is a Zener diode used as?
a) Oscillator  b) Regulator  c) Rectifier  d) Filter
What is a transistor made up of?
a) Chip  b) Insulator  c) Semiconductor  d) Metal
What are sunglasses made of?
a) Colored glasses  b) Tin glass  c) Silica  d) Polaroids
Which of the following causes dispersion?
a) Refraction  b) Reflection  c) Total internal reflection  d) Total internal dispersion
What will be the color of the sky in the absence of the atmosphere?
a) White  b) Dark  c) Blue  d) Pink
Which among the following is denoted by δ?
a) Horizontal component  b) Magnetic meridian  c) Magnetic declination  d) Magnetic inclination
At the magnetic North Pole of the Earth, what is the value of the angle of dip?
a) Zero  b) Minimum  c) Infinity  d) Maximum
What is the net magnetic flux through a closed surface?
a) Positive  b) Negative  c) Zero  d) Depends on the nature of the surface
Which among the following is the source of the magnetic field (magnetism)?
a) Mechanical origin  b) Electrical origin  c) Chemical origin  d) Potential origin
Diamond is an example of _______
a) solid with hydrogen bonding  b) electrovalent solid  c) covalent solid  d) glass
Which of the following is not a crystal system?
a) Cubic  b) Trigonal  c) Triclinic  d) Hexaclinic
Which type of solid crystals will conduct heat and electricity?
a) Ionic  b) Covalent  c) Molecular  d) Metallic
Quartz is an example of ___________
a) molecular solids  b) ionic solids  c) covalent solids  d) metallic solids
Which of the following is a true solution?
a) Salt solution  b) Ink  c) Blood  d) Starch solution
What is pumice stone an example of?
a) Solid aerosol  b) Emulsion  c) Liquid aerosol  d) Solid foam
Which of the following forces is involved in physical adsorption?
a) Gravitational force  b) Magnetic force  c) Van der Waals force  d) Electromagnetic force
Which of the following is present at the time of cracking of hydrocarbons?
a) Copper  b) Zeolite  c) Nickel  d) Molybdenum
How does a catalyst change during a reaction?
a) Physically  b) Mass-wise  c) Chemically  d) Quantitatively
Identify the compound which does not act as a target for drug action in the human body?
a) RNA  b) DNA  c) Vitamin C  d) Protein
Alitame is ______ times sweeter than cane sugar.
a) 50  b) 100  c) 600  d) 2000
Dishwashing liquids are examples of ______
a) soaps  b) anionic detergents  c) cationic detergents  d) non-ionic detergents
Amines are derivatives of ______
a) NCl3  b) NH3  c) N2  d) CH3NH2
How many lone pairs of electrons does the nitrogen atom of amines have?
a) 0  b) 1  c) 2  d) 3
Which of the following is the least reactive functional group?
a) Alcohols  b) Ethers  c) Aldehydes  d) Ketones