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CBSE - IX
CBSE - IX Science Solved Questions
Question 1
A body starts to slide over a horizontal surface with an initial velocity of 1 m/s. Due to friction, its velocity decreases at the rate of 0.01 m/s2. Then the time taken by the body to stop is ____ s.A) 200
B) 100
C) 10
D) 1000
Question 2
If a force of 75 N acting on an object produces an acceleration of 1.5 m/s2 in it, then, the mass of the object is ____ kg.A) 50
B) 25
C) 75
D) 100
Question 3
If the mass of the Sun is 2 x 1030 kg, the distance between the Earth and the Sun is 1.5 x 1011 m and the period of revolution of the Earth around Sun is 365 days. The value of 'G' is ____ N m2/kg2.A) 6.67 x 10-22
B) 6.67 x 10-16
C) 6.67 x 1011
D) 6.67 x 10-11
Question 4
The distance through which a body moves when a constant force of 10 N acts on it to change its KE from 20 J to 40 J is ____ m.A) 4
B) 2
C) 5
D) 0
Question 5
Dry ice or solid carbon dioxide ____ at room temperature.A) freezes
B) melts
C) sublimes
D) condenses
Question 6
Gold and silver are used for making jewellery. Which of the following properties of the metals make them suitable for making jewellery?A) They are ductile
B) They are not malleable
C) They are not lustrous
D) They are cheap
Question 7
Which of the following has more atoms?(i) 50 g of sodium
(ii) 50 g of zinc
A) 50 g of zinc
B) 50 g of sodium
C) Both have the same number of atoms
D) Depends on the physical state of the element
Question 8
Which of the following bacterial diseaseA) Leprosy
B) Tetanus
C) Tuberculosis
D) Gonorrhoea
Question 9
Ammonium salts are absorbed by the clay in the soil and are chemically altered by ____.A) virus
B) algae
C) bacteria
D) protozoa
Question 10
Which of the following statements is correct?A) The honey yield of Apis mellifera is same as the Apis indica.
B) The honey yield of Apis indica is much more than that of the Apis mellifera.
C) The honey yield of Apis mellifera is much more than that of the Apis indica.
D) The honey yield of Apis mellifera is slightly more than that of the Apis indica.
