Grade 9th

1. The number of perpendicular components of a force are:

• 1

• 2

• 3

• 4

1. Which of the following is a vector quantity ?

• speed

• distance

• displacement

• power

The number of base units in SI are

• 3

• 6

• 7

• 9

1. Earths gravitational force of attraction vanishes at :

• 6400km

• infinity

• 42300km

• 1000km

1. value of g increases with the

• increases in mass of body

• increase in altitude

• decrease in altitude

• none of these

1. A measuring cylinder is used to measure :

• mass

• volume

• area

• level of liquid

1. A couple is formed by

• two forces perpendicular to each other

• two like parallel forces

• two equal and opposite forces in the same line

• two equal and opposite forces not in the same line

1. The altitude of geostationary orbit in which communication satellites are launched from the center of earth is:

• 850 km

• 1000 km

• 6400 km

• 42300 km

1. Inertia depends upon

• mass

• force

• net force

• velocity

1. Racing cars are made stable by:

• increasing their speed

• decreasing their mass

• lowering their centre of gravity

• decreasing their width