CBSE - IX
Question 1
A lift starts upwards from rest with uniform acceleration. After 4 s, it has acquired a velocity of 10 m/s, and proceeds at this velocity for 2 s. The motion is now uniformly retarded and the lift comes finally to rest 9 s after starting. Then, from the velocity-time graph of the motion, the total distance travelled by the lift is ____ m.
A) 55
B) 45
C) 50
D) 25
Question 2
A solid weighs 32 g in air and 28.8 g in water. Then the relative density of the solid is ____.
A) 20
B) 15
C) 10
D) 5
Question 3
A man who weighs 70 kg climbs a staircase carrying a 10 kg load on his head. The staircase has 25 steps and each step is 25 cm height. The work done by the person is ____ J.
A) 3680
B) 4900
C) 5000
D) 2896
Question 4
The minimum distance from an obstacle to hear an echo is ____ m. (Consider the velocity of sound in air as 330 m/s.)
A) 33
B) 16.5
C) 330
D) 165
Question 5
The correct order of events happening to the water molecules when vapours are condensed and crystallized to ice is ____.
A) expansion, lattice structure and contraction
B) intermolecular bond, lattice bond and contraction
C) lattice structure, contraction and expansion
D) contraction, intermolecular bond and crystal lattice bonds
Question 6
Pure crystals of copper sulphate are obtained by crystallization of impure crystals.
A) True
B) False
Question 7
12 g of carbon contains 6.022 x 1023 atoms of carbon. Mass of one carbon atom will be ____.
A) 12 g
B) 
C) 
D) 
Question 8
27Co60 and 27Co58 are ____.
A) isotopes
B) isobars
C) isotones
D) isomers
Question 9
Function of axon is to ____.
A) bring impulse into cyton
B) take impulse away from cyton
C) carry glomerular filtrate in urinary bladder
D) carry blood to heart
Question 10
Scurvy is caused due to deficiency of vitamin____.
A) A
B) B
C) C
D) D