120/22 - ۴
38. Match List —1 with List -॥|:
List-1 List - II
a. Hydrodamalis gigas 1. Mauritius
b. Raphus cuculla ii, Australia
c. Thylacinus cynocephalus ॥. Africa
d. Equus quagga quagga iv. Russia
Choose the correct answer from the option given below.
५) 8 - #, 0 - #, ८ ~ 1५, ४ ~ । B) a-ili, b-iv, c—i,d—-ii
©) 8 -॥, 0 - ५, ८ -॥, ~| 0) 8 = ५, 0 - |, €= ॥ ५ - ॥

38.

40,

41.

A particle 01 of mass m,, starting from rest at the point P moves down a frictionless
straight inclined path PO at 45° to the horizontal under gravity to reach the point 0
‘on the ground. Another particle 02 of mass ரா, ಇ ಗ್ಯ is dropped from P to vertically
fall to the point R on the ground. Then which of the following are true ?

i. p, and p, will touch the ground with equal speeds.

i. ۲, and 02 will touch the ground simultaneously.

iii, Ratio of the time taken by P, to the time taken by p, to touch the ground is 42.
iv. p, and ‏وم‎ will touch the ground with speeds whose ratio is v2.

A) iand ii B) i and iii

C) iiandiv D) ili and iv

A concave mirror of focal length f and radius of curvature R is cut into halves by a
plane containing the principal axis. Then which of the following are false 7

i. Radius of curvature changes to R/2.

ர்‌. Focal langth changes to f/2.

ii. Focal langth changes to 2f.

iv. Radius of curvature changes to 2R while focal length remains the same.
A) Only i and ii B) Only iii

C) Only iv D) All the four i, ii, iii and iv

A sphere of radius r of material of density p is fully immersed in a liquid of density ൨.
The loss of weight of the sphere would be (acceleration due to gravity is g)

A) (4/3)n"pg B) (4/3) प्प
010 D) None of the above
=18-