Science Class 6th

441. Which of these move objects both horizontally and vertically?

A. Crane

B. Wind up clock

C. Bicycle

D. All of these

442. In bicycle, a combination of ________ is used.

A. Gears

B. Wheel and Axle

C. Both ‘a’ and ‘b’

D. None of these

443. A hand drill consists of _______ mutually perpendicular gears.

A. 3

B. 2

C. 4

D. 5

444. A ________ system is used in wind up clock.

A. Wheel and Axle

B. Pulley

C. Gear

D. None of these

445. There are ______ types of simple machines.

A. 4

B. 6

C. 7

D. 8

446. The diameter of wheel is ______ than the diameter of axle.

A. Larger

B. Smaller

C. None of these

 

447. Gear can transmit ______ to another gear.

A. Motion

B. Force

C. All of these

448. A flag pole is an example of?

A. Movable pulley

B. Pulley system

C. Fixed pulley

D. None of these

449. A hand drill consists of two mutually perpendicular________.

A. Leaver

B. Gears

C. Pulleys

D. Wheels

450. Light can travel through______.

A. Vacuum

B. Water

C. Air

D. All of these

451. Light passes through _______ objects.

A. Translucent

B. Transparent

C. None of these

452. The passage of light through transparent object is called ______.

A. Transmission of light

B. Reflection

C. Refraction

D. None of these

453. Tracing papers and woods are ?

A. Transparent

B. Translucent

C. Reflection

D. Light

454. The creation of heat in an opaque surface as a result of striking of light ray is called?

A. Transmission

B. Absorption of light

C. Both ‘a’ and ‘b’

D. None of these

455. The bouncing back of light from a shiny surface like mirror is called?

A. Reflection

B. Refraction

C. Absorption

D. None

456. The ray falling on mirror is called?

A. Reflected ray

B. Refracted ray

C. Incident ray

457. The bounced ray is called ______ ray.

A. Reflected

B. Refracted

C. Incident

D. None

458. The line perpendicular on the point of incidence is called _______.

A. Abnormal

B. Incidence

C. Normal

D. None of these

459. Angle made by incident ray with normal is called angle of _______

A. Reflection

B. Incidence

C. Both ‘a’ and ‘b’

D. None of these

460. The angle made by reflected ray along the normal is called?

A. Angle of reflection

B. Angle of incidence

C. None of these