basic questions

Question 1

What are the basic SI units?

Answer 1

s
m
kg
A
K
mol
cd

Question 2

What kinda motion is presented in the graph?

a.uniform motion
b.uniform acceleration

Answer 2

Uniform acceleration

Question 3

What kinda motion is presented in the graph?

a.uniform motion
b.uniform acceleration

Answer 3

uniform motion

Question 4

The first Newton principle of dynamics states

Answer 4

A body acted on by no net force moves with constant velocity
(which can be zero) and zero acceleration.

Question 5

The second Newton principle of dynamics states

Answer 5

If a net external force acts on a body, the body accelerates

Question 6

The third Newton principle of dynamics states

Answer 6

If object A exerts a force on B, then B exerts an equal but opposite
force on A

Question 7

Momentum conservation principle states

Answer 7

the total momentum of a closed system remains constant if no external forces act on it

Question 8

The torque is defined by…

Answer 8

Cross product of the force F and distance r

M = r x F

r = distance
F = force

Question 9

The transverse wave is when

Answer 9

the disturbance is perpendicular to the direction of the wave

Question 10

The longitudinal wave is when

Answer 10

the disturbance is parallel to the direction of the wave

Question 11

The diffraction is

Answer 11

associated with wave propagation, such as bending, spreading and interference of waves passing by an object or aperture that disrupts the wave

Question 12

The interference is

Answer 12

Interaction of waves which are correlated or coherent with each
other, either because they come from the same source or because
they have the same or nearly the same frequency.

Question 13

The reflection is observed when

Answer 13

when a wave encounters a boundary between two different media and is redirected back into the original medium.

Question 14

The Doppler effect is observed

Answer 14

the change in frequency and wavelength of a
wave as perceived by an observer moving relative to the source of
the waves

Question 15

If the found intensity is increased twice the wave energy is increased by

Answer 15

2

Question 16

When localising the source of sound of low frequency the following mechanism is applied

Answer 16

The intensity of the waves are compared

Question 17

When localising the source of sound of high frequency the following mechanism is applied

Answer 17

the phase of the waves is compared

Question 18

Polarisation of light is used by

Answer 18

honeybees

Question 19

Types of polarizations

Answer 19

Linear
Circular
Elliptical
Unpolarized light

Question 20

An eye is capable to see at long and short distances because

Answer 20

It can adjust the shape of the lens

Question 21

Does the size of the head matter for recognizing the position of the sound source

Answer 21

Yes, the size of the head matters, this is because the shape and size of the head affect the way sound waves are filtered and modified before reaching the ears.

Question 22

The mechanical wave can be characterised by

Answer 22

being a wave that happens in a medium

Question 23

The electromagnetic wave can be characterised by

Answer 23

traveling through a vacuum, without a medium

Question 24

The gravitational wave can be characterised by

Answer 24

can be characterized by their ability to cause minute deformations in biological structures.

Question 25

Concentration of optically active compounds can be measured

Answer 25

by measuring the distortion of the polarisation plane angle

Question 26

1st law of thermodynamics

Answer 26

Energy cannot be created or destroyed

Δ U = Q - W

Δ U = change in internal energy
Q = heat added to the system
W = work done by the system