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Showing 2126 to 2150 of 3046 questions (page 86 of 122).

2126. Oxidation of a secondary alcohol gives

A. a ketone B. an ester C. a carboxylic acid D. an alkene E. an aldehyde

2127. Aliphatic amines are more basic than ammonia because the alkyl groups are

A. electron withdrawing B. electron releasing and increase the availability of the lone pair C. aromatic D. acidic E. unable to donate electrons

2128. The sequence of amino acids in a polypeptide chain constitutes the

A. active site only B. quaternary structure C. tertiary structure D. secondary structure E. primary structure of the protein

2129. The monomer of natural rubber is

A. isoprene B. butadiene C. styrene D. ethene E. vinyl chloride

2130. A thermosetting plastic differs from a thermoplastic in that it

A. dissolves in water B. softens repeatedly on heating C. conducts electricity D. sets permanently on heating because of cross linking E. is always transparent

2131. Lipids are hydrolysed by alkali to give glycerol and

A. nucleotides B. amino acids C. salts of fatty acids D. alcohols only E. monosaccharides

2132. Ozone depletion is most severe over

A. the equator B. northern Europe C. the Sahara D. the Pacific Ocean E. Antarctica

2133. Solid waste disposal by sanitary landfill requires lining of the site chiefly to

A. improve appearance B. increase the temperature C. prevent leachate from contaminating groundwater D. speed up decay E. allow gas to escape

2134. How many base units are defined in the International System of Units (SI)?

A. 9 B. 5 C. 6 D. 7 E. 8

2135. The dimensions of Planck's constant are the same as those of

A. angular momentum B. energy C. linear momentum D. force E. power

2136. A screw gauge has a pitch of 0.5 mm and 50 divisions on its circular scale. Its least count is

A. 0.001 mm B. 0.01 mm C. 0.05 mm D. 0.025 mm E. 0.5 mm

2137. Which of the following is a supplementary unit in SI?

A. newton B. kelvin C. mole D. joule E. radian

2138. The dimensional formula of pressure is

A. [ML2T-2] B. [ML-2T-2] C. [ML-1T-2] D. [MLT-2] E. [ML-3T0]

2139. If a quantity is measured as 4.0 cm with an absolute uncertainty of 0.1 cm, the percentage uncertainty is

A. 4% B. 25% C. 0.25% D. 2.5% E. 0.4%

2140. A dimensionally correct equation

A. cannot contain constants B. may still be physically incorrect C. always contains a trigonometric term D. must be numerically correct E. is always physically correct

2141. A unit vector perpendicular to the plane containing vectors A and B is given by

A. (A x B)/|A x B| B. (A.B)/|A||B| C. A.B D. A + B E. A - B

2142. The value of i . (j x k) is

A. i C. j D. -1 E. 1

2143. Two forces of 10 N each act on a body with an angle of 120 degrees between them. The magnitude of the resultant is

A. 17.3 N B. 14.1 N C. 20 N D. 0 N E. 10 N

2144. If A + B = A - B, then vector B must be

A. a null vector B. equal to A C. parallel to A D. a unit vector E. perpendicular to A

2145. Torque is defined as

A. r . F B. F . r C. r x F D. F x r E. r + F

2146. For a body in complete equilibrium, the number of independent conditions that must be satisfied is

A. 4 B. 5 C. 3 D. 2 E. 1

2147. The scalar product of two mutually perpendicular vectors is

A. unity B. zero C. equal to their cross product D. negative E. maximum

2148. A vector of magnitude 10 units makes an angle of 30 degrees with the x-axis. Its y-component is

A. 10 units B. 2.5 units C. 8.66 units D. 7.07 units E. 5 units

2149. Newton's second law of motion provides the definition of

A. mass B. force C. momentum D. inertia E. action and reaction

2150. The SI unit of impulse is equivalent to

A. N m B. J s C. kg m s-1 D. kg m s-2 E. N s-1

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