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Showing 1601 to 1625 of 3046 questions (page 65 of 122).

1601. Which of the following is a reducing sugar?

A. sucrose B. starch C. glycogen D. cellulose E. glucose

1602. The percentage of nitrogen in urea is about

A. 35% B. 60% C. 46% D. 82% E. 21%

1603. Depletion of stratospheric ozone is mainly caused by

A. nitrogen gas B. chlorofluorocarbons C. methane D. sulphur dioxide E. carbon dioxide

1604. Acid rain is caused mainly by the oxides of

A. carbon and hydrogen B. sulphur and nitrogen C. sodium and potassium D. silicon and boron E. iron and copper

1605. The chief greenhouse gas responsible for the enhanced greenhouse effect is

A. nitrogen B. argon C. helium D. carbon dioxide E. oxygen

1606. The stationary phase in thin layer chromatography is usually

A. silica gel or alumina B. the mobile solvent C. air D. water only E. the sample itself

1607. Which quantity has the same dimensions as work?

A. power B. impulse C. torque D. force E. pressure

1608. The number of significant figures in 1.230 x 10^4 is

A. 3 B. 4 C. 6 D. 2 E. 5

1609. The sum of 2.50 cm and 1.6 cm, expressed to the correct number of decimal places, is

A. 4 cm B. 4.16 cm C. 4.10 cm D. 4.100 cm E. 4.1 cm

1610. One radian is approximately equal to

A. 180 degrees B. 6.28 degrees C. 1 degree D. 57.3 degrees E. 3.14 degrees

1611. Two vectors of magnitudes 3 and 4 units give a resultant of 7 units. The angle between them is

A. 90 degrees B. 0 degrees C. 180 degrees D. 120 degrees E. 45 degrees

1612. The cross product of a vector with itself is

A. its magnitude squared B. undefined C. the null vector D. a unit vector E. twice the vector

1613. The magnitude of the cross product of two vectors of magnitudes 2 and 3 units with 30 degrees between them is

A. 3 B. 6 D. 5.2 E. 1.5

1614. A force of 5 N acts perpendicular to a spanner at a distance of 0.2 m from the pivot. The torque produced is

A. 0.04 N m B. 10 N m C. 25 N m D. 1 N m E. 5 N m

1615. The projection of vector A along vector B is given by

A. A x B B. A.B / |A| C. A.B / |B| D. A.B E. |A| |B|

1616. A couple consists of

A. two equal and opposite parallel forces not acting along the same line B. a single force through the centre of mass C. three concurrent forces D. two unequal opposite forces E. two equal forces in the same direction

1617. The area under a velocity time graph represents

A. momentum B. displacement C. power D. force E. acceleration

1618. A ball is thrown vertically upwards with 19.6 m s-1. The maximum height reached is

A. 4.9 m B. 29.4 m C. 9.8 m D. 19.6 m E. 39.2 m

1619. A stone is dropped from rest and falls 45 m. The time taken is about

A. 2.1 s B. 9.0 s C. 3.0 s D. 4.5 s E. 1.5 s

1620. The slope of a momentum time graph gives

A. velocity B. impulse C. kinetic energy D. force E. power

1621. When a bomb at rest explodes into two unequal fragments, the two fragments have

A. equal speeds B. equal kinetic energies C. zero total kinetic energy D. equal masses E. equal and opposite momenta

1622. The coefficient of restitution for a perfectly elastic collision is

A. 1 B. 0.5 C. between 0 and 1 but never 1 D. greater than 1

1623. A ball of mass m strikes a wall normally with speed v and rebounds with the same speed. The magnitude of the change in its momentum is

A. 4mv B. 2mv C. zero D. mv E. mv/2

1624. A body moves with uniform velocity. The net force acting on it is

A. proportional to its speed B. equal to its weight C. zero D. maximum E. equal to its momentum

1625. One joule is equal to

A. 10^3 erg B. 10^7 erg C. 10^-7 erg D. 10^9 erg E. 10^5 erg

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