221. Only male frog produce croacking sound because _________ ?
A. Male frog can magnify their voice with the help of sound box.
B. Male frog have three pair of vocal cord
C. Female frog have larynx but no vocal cord
D. Female frog have no larynx

222. Which of the following is a force?
A. Heat
B. Light
C. Magnetism
D. Kinetic

223. What animal has longest gestation period of about 640 to 660 days or 95 weeks of any land animal ?
A. Blue Whale
B. Elephant
C. Opossum
D. None of these

224. A doctor who specializes in diseases of the nose?
A. Rhinologist
B. Otologist
C. Pathologist
D. Podiatrist

225. Which among the following types of lenses are prescribed by doctors for a patient suffering from astigmatism?
A. Cylindrical Lens
B. Concave Lens
C. Spherical Lens
D. Convex Lens

226. A convex mirror always ___________ ?
A. Forms a real image
B. Forms a virtual image
C. Forms an inverted image
D. Produces a larger image

227. The distance of a place South or North of equator is called__________?
A. Longitude
B. Latitude
C. Aptitude
D. None of these

228. The distance between the optical centre of a convex lens and its principal focus is called its_______?
A. Focal Length
B. Radius of Curvature
C. Power
D. Magnification

229. Why the colour of the Ocean appears blue?
A. Because the sunlight falling on it is scattered.
B. Because the sunlight falling on it is absorbed.
C. Because the sunlight falling on it is refracted.
D. Because the sunlight falling on it is reflected.

230. What type of a mirror is used in anti-shop-lifting-devices?
A. Convex mirror
B. Concave mirror
C. Plane mirror
D. Both (b) and (c)