133.A boy is playing on a swing in sitting position. The time period of oscillations of the swing is T. If the boy stands up, the time period of oscillation of the spring will be.
(a) T
(b) Less than T
(c) More than T
(d) Such as cannot be predicted
134.Radar detects the enemy’s aircraft using
(a) Ultrasonic waves
(b) Infrasonic waves
(c) Sound waves
(d) Radio waves
135. The Raman effect is used to study the
(a) X-rays
(b) Molecular energy levels
(c) Cells
(d) Chromosomes
136.The part of the human body which co-ordinates the various functions of the different organs is the
(a) Heart
(b) Liver
(c) Nerves
(d) Brain
137. In a human body, the average heart beat per minute is
(a) 70
(b) 50
(c) 90
(d) 110
138.Penicillin, an important antibiotic, was invented by
(a) Robert Koch
(b) Alexander Fleming
(c) Jonas Salk
(d) Edward Jenner
139.Gelatin is added in the ice-cream to
(a) Avoid crystal formation
(b) Hasten freezing
(c) Give flavor
(d) Act as a sweetening agent
140. The law of gravitation was formulated by
(a) Archimedes
(b) Galileo
(c) Newton
(d) Faraday
141.Fish plates in railway track are used
(a) To avoid tracks being distorted due to the temperature fluctuations
(b) To connect two rails
(c) To control the speed of the train
(d) To keep the rails equidistant
142. Dialysis is used for a patient suffering from the
(a) Lung trouble
(b) Liver trouble
(c) Kidney trouble
(d) Heart trouble
143. Atmospheric pressure is measured by
(a) Hygrometer
(b) Barometer
(c) Pyrometer
(d) Spherometer
144.Which metal is used in storage batteries ?
(a) Copper
(b) Aluminium
(c) Lead
(d) Zinc
145. Which disease is caused by a virus ?
(a) Typhoid
(b) Malaria
(c) Small pox
(d) Cholera
146. In the earthen pot, cooling of water depends upon
(a) The atmospheric humidity
(b) The outside temperature
(c) The wind
(d) All of these
147. Transistor is preferred to the radio valve because
(a) It requires no heater current
(b) It consumes less power
(c) It is less bulky and fragile
(d) Of all of these advantages
148. A telescope is used to see
(a) Nearby objects
(b) Distant objects
(c) Small objects
(d) Cells
149. Which of the following is present in greater proportion in bones ?
(a) Phosphorus
(b) Iron
(c) Iodine
(d) Calcium
150. Yeast is used in making bread because it produces
(a) Co2
(b) Bacteria
(c) Sugar
(d) Oxygen
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