CLASS 7 PHYSICS
FULL MARKS :20
All questions are compulsory.
Q1. Write the full form of FPS, CGS and MKS system of unit. 3
Q2. State the SI unit of i) Luminous intensity ii) Temperature iii) Electric current . 3
Q3 A block of mass 1000 kg has volume 2 metre cube. Calculate its density in i) kg/ metre cube ii) g/cm cube. 3
Q4. A bus covers 200km in 5 hr and a car covers 105 km in 3hr. Which of the two travels faster? 3
Q5. Define density and state its SI unit. 2
Q6. Give reason : The density of iron is more than that of cotton. 2
Q7. Name two devices to measure the volume of an object. 2
Q8. The space occupied by a solid is called ___________ and the amount of surface of a body is called ______________. 2
Answers:
A1. FPS: Foot, Pound, Second . CGS: Centimetre, gram, second. MKS: Metre, kilogram, Second.
A2. I) candela ii) kelvin iii) ampere
A3. m =1000kg, V=2 metre cube. Density =m/V=1000/2= 500kg /m cube. Density= 500/1000 g/cm cube.=0.5 g/cm cube.
A4. For the bus, distance= 200km, time= 5hr. Speed of the car=distance/time=200/5=40km/hr.
For the car, distance=105km, time= 3hr. Speed of the car=distance/time= 105/3=35 km/h
Hence, the bus is faster.
A5. Density is defined as mass per unit volume of a body. Its SI unit is kg/m cube.
A6. The density of iron is more than that of cotton because the molecules are more closely packed in iron than in cotton.
A7. Measuring cylinder and measuring beaker.
A8. Volume, area.
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