Physics

Free set

Showing 1151 to 1175 of 1648 questions (page 47 of 66).

1151. Fusion of deuterium nuclei in the laboratory is difficult mainly because of

A. the scarcity of deuterium B. the very high temperature and confinement needed C. the weak nuclear force D. the absence of neutrons E. the large mass of deuterium

1152. A radioactive tracer used to study thyroid function is an isotope of

A. uranium B. cobalt C. carbon D. iodine E. potassium

1153. How many base units are defined in the International System of Units (SI)?

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

1154. The dimensions of Planck's constant are the same as those of

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

1155. 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

1156. Which of the following is a supplementary unit in SI?

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

1157. The dimensional formula of pressure is

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

1158. 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%

1159. 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

1160. 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

1161. The value of i . (j x k) is

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

1162. 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

1163. 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

1164. Torque is defined as

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

1165. 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

1166. The scalar product of two mutually perpendicular vectors is

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

1167. 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

1168. Newton's second law of motion provides the definition of

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

1169. 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

1170. In a perfectly elastic collision, which quantities are conserved?

A. momentum and mass only B. kinetic energy only C. momentum only D. momentum and kinetic energy E. kinetic energy and mass only

1171. The maximum horizontal range of a projectile is obtained at a launch angle of

A. 45 degrees B. 30 degrees C. 90 degrees D. 60 degrees E. 75 degrees

1172. At the highest point of its trajectory, the velocity of a projectile is

A. horizontal B. vertical and upward C. zero D. vertical and downward E. equal to the launch velocity

1173. A body falling freely from rest covers distances in successive equal intervals of time in the ratio

A. 1:1:1 B. 1:3:5 C. 1:4:9 D. 2:3:4 E. 1:2:3

1174. Rocket propulsion is explained on the basis of

A. Newton's first law B. conservation of angular momentum C. conservation of energy D. law of gravitation E. conservation of linear momentum

1175. The time of flight of a projectile launched with speed v at angle theta over level ground is

A. v2 sin 2theta / g B. 2v cos theta / g C. 2v sin theta / g D. v cos theta / g E. v sin theta / g

Previous 1 2 … 45 46 47 48 49 … 65 66 Next

Get full access to the MCQ bank

Premium questions, timed mock tests, and detailed explanations.

See premium plans