CBSE IX

CBSE IX Science Set - 2

Question 1

Biopesticides are recommended, because they ____.
A) are cheap
B) will not have adverse effects on the environment
C) can be produced easily
D) are readily available

Question 2

The gas produced by paddy fields which is involved in global warming is ____.
A) chlorine
B) methane
C) hydrogen sulphide
D) carbon dioxide

Question 3

Matured RBC's are always nucleated.
A) True
B) False

Question 4

The maximum number of electrons that can be accommodated in the innermost shell are ____.
A) 8
B) 2
C) 18
D) 32

Question 5

What mass of carbon dioxide will contain 3.011 × 1023molecules?
A)
B)
C)
D)

Question 6

Liquids have definite volume but no definite shape.
A) True
B) False

Question 7

A sound wave propagating through a medium has bounced back into the same medium by hitting a hard surface and then such a phenomenon is called ____ of sound.
A) refraction
B) reflection
C) polarization
D) dispersion

Question 8

A car of mass 175 kg traveling on a rough horizontal road stops after traveling 7.5 m. If the frictional force between the tyres of the car and road is 350 N, then, the work done by the frictional force on the car is ____ J.
A) 2625
B) -2625
C) 1312
D) -1312

Question 9

If two masses 9 kg and 2 kg are separated by a distance of 'r' and the force of attraction between them is 134 N. Then, the value of 'r' is ____ m. Given, G = 6.67 × 10-11N m2/kg2.
A) 2 × 109
B) 2 × 107
C) 3 × 10-9
D) 2.99 × 10-6

Question 10

Force 'F' applied on mass 'm' gives an acceleration of 15 m/s to it. When same force is applied on mass 'm', it produces an acceleration of 10 m/s. If the two masses are fixed together and the same force is applied on the combination then the acceleration will be ____ m/s.
A) 6
B) 8
C) 9
D) 11