CBSE - X
CBSE - X Science Solved Questions
Question 1
Two plane mirrors are placed perpendicular to each other. A ray striking the first mirror at an angle of incidence of 45o after reflection falls on the second mirror. The direction of the ray after reflection from the second mirror will be ____ to the first incident ray.A) parallel
B) perpendicular
C) at an angle of 30o
D) at an angle of 45o
Question 2
The eyesight of a person suffering from defective eyes is corrected by placing a concave lens before the eye. Then, we can say that the person is suffering from ____.A) hyper myopia
B) presbyopia
C) myopia
D) astigmatism
Question 3
5 joule of work is done in moving a charge of 0.5 C between two points in a current carrying conductor. The potential difference between these two points is ____ V.A) 10
B) 5
C) 1
D) 50
Question 4
A current carrying conductor is placed normal to the magnetic field experience force F. When it is rotated through an angle θ, the force experienced by it is
. The angle through which it is rotated is ____.A) 30o
B) 45o
C) 60o
D) 90o
Question 5
The balanced equation for the following reaction is ____.
A) 
B) 
C) 
D) 
Question 6
K2SO4 is ____ salt.A) a normal
B) a basic
C) an amphoteric
D) an acidic
Question 7
A black layer was deposited on Cu plate dipped in AgNO3. This is because ____ is formed.A) Ag2O
B) CuN
C) CuO
D) Cu(NO3)2
Question 8
The rate of breathing increases during vigorous physical exercise, because ____.A) the demand for oxygen is more
B) the demand for oxygen is less
C) energy is released
D) carbon dioxide gets accumulated
Question 9
Which of the following controls and integrates the activities of pituitary gland?A) Spinal cord
B) Hypothalamus
C) Pans varolli
D) Medulla oblongata
Question 10
Presence of different types of beaks in finches of Galapagos Island adapted to different feeding habits, provide evidence for ____.A) struggle for existence
B) natural selection
C) fluctuating variations
D) law of use and disuse