Science class 9 exam sample1

Which one of them is a fundamental quantity?

• Area

• Volume

• Force

• Time

The fundamental unit involved in volume

• Kg

• Meter

• Second

• Mol

1HP is equivalent to

• 764 W

• 769 W

• 746 W

• 796 W

Light energy is converted into electrical energy is

• Photosynthesis

• Photoelectric shell

• Photography

• Photolysis

The Amount 1J is equivalent to

• 1Ns

• 1Nkg

• 1Ngm

• 1Nm

White light is mixture of

• Red

• Green

• Blue

• All of them

When a ray of light from air enter a denser medium it

• bend away from the normal

• bend toward the normal

• goes undeviated

• is reflected back

Bats detect the obstacles in their path by receiving the reflected

• Infrasonic wave

• Ultrasonic wave

• Light wave

• Radio wave

The minimum distance between the source and the reflector in air, so that an echo is hear is approximately equal to

• 10 m

• 17 m

• 34 m

• 50 m

Valency of nobel gases is

• 1

• 0

• 3

• 4