Question 1

An object is placed 20 cm in front of a convex mirror of radius of curvature 80 cm. The distance of the image formed by the mirror is ____ cm from its pole.
A) 10
B) 12.33
C) 13.33
D) 14.33

Question 2

The sun appears red at sunset because sunlight travels the least distance through the Earth's atmosphere.
A) True
B) False

Question 3

The value of the current flowing through 2 resistor in the given circuit is ____ A.
A) 2
B) 3
C) 1
D) 1.5

Question 4

A straight current carrying conductor is placed in east-west direction. When the magnitude of current is doubled, the force acting on it ____.
A) increases 4 times
B) is halved
C) remains same
D) is doubled

Question 5

 

The compound formed in the above reaction is ____ oxide.

A) Fe(II)(III)
B) Fe(I)(II)
C) Fe(I)(III)
D) Fe(III)

Question 6

. What do these three compounds represent?
A) Unsaturated compounds
B) Hydrocarbons
C) Homologous series
D) Carboxylic acids

Question 7

X, Y and Z are elements in Dobereiner triad. If the atomic mass of element X is  and that of element Z is 128 , then the atomic mass of Y is ____.
A) 32
B) 80
C) 128
D) 160

Question 8

In plants, large amount of water is lost through ____.
A) stomata
B) guard cells
C) chloroplasts
D) mesophyll cells

Question 9

Neurotransmitters are present at ____.
A) cyton
B) axon
C) synapse
D) nerve

Question 10

The factor which does not change when light ray passes from one medium to another is ____.
A) wave length
B) frequency
C) velocity
D) None of the above