written exam

Question 1

For concave mirrors, the condition that produces real, inverted and enlarged image is:

Answer 1

f < s < 2f, s’ > 2f

Question 2

For concave mirrors, the condition that produces real, inverted and reduced image is:

Answer 2

f > 0, s > 2f, f < s’ < 2f

Question 3

For concave mirrors, the condition that produces virtual, upright and enlarged image is:

Answer 3

s<f,s’<0

Question 4

The condition that produces virtual, upright and reduced image is:

Answer 4

f < 0, s > 0, s’ < 0

Question 5

Which describes best a positive lens:

Answer 5

converging lens

Question 6

Which best describes a negative lens:

Answer 6

diverging lens

Question 7

When the image is positioned in the opposite side as the outgoing light, it is a:

Answer 7

Virtual image

Question 8

When the image is positioned in the same side as the outgoing light, it is a:

Answer 8

Real image

Question 9

When the image distance is greater than the object distance, the magnification is:

Answer 9

inverted and enlarged

Question 10

When the image distance is less than the object distance, the magnification is:

Answer 10

inverted and reduced

Question 11

When the light moves from a low to high index of refraction, the speed of light in the medium:

Answer 11

slows down

Question 12

When the light moves from a high to low index of refraction, the speed of light in the medium:

Answer 12

speeds up

Question 13

Which best describes this scenario: a light ray refracts through from a low to higher index of refraction medium causing the rays to:

Answer 13

bend towards the normal line

Question 14

Which best describes this scenario: a light ray refracts through from a high to lower index of refraction medium causing the rays to:

Answer 14

bend away from the normal line

Question 15

When an object is positioned at infinity, which statement describes the relation of the focal length and the image distance:

Answer 15

f = s’

Question 16

For a pipe closed at one end, the waves at the closed end is:

Answer 16

a node

Question 17

For a pipe closed at one end, the waves at the open end is:

Answer 17

an antinode

Question 18

For a pipe closed at one end, the values of the harmonics present are:

Answer 18

odd positive numbers only

Question 19

When the temperature increases, the speed of sound in air will:

Answer 19

increase

Question 20

When the molecular mass decreases, the speed of sound in air:

Answer 20

increases

Question 21

The _ of a substance is the amount of heat that must be added to or removed from a unit mass of that substance to raise its temperature by 1C:

Answer 21

Specific heat capacity

Question 22

When a vapor condenses into a liquid:

Answer 22

it liberates heat

Question 23

The unit of heat are the following except:

Answer 23

Kg.m/s^2

Question 24

Which of the following equations must be used to calculate the amount of heat required to melt an ice:

Answer 24

Q = +mLf

Question 25

Which of the following equations must be used to calculate the amount of heat to convert steam to liquid:

Answer 25

Q = -mLv

Question 26

It takes 53.0 J to raise the temperature of an 8.10 g piece of unknown metal from 13.0C to 24.0C. What is the specific heat for the metal:

Answer 26

595 J/kg.K

Question 27

The aluminum calorimeter in “activity 2” is used in the experiment because of the following reason except:

Answer 27

to eliminate heating of the container since aluminum is a poor conductor.

Question 28

It is a quantity which indicates the change in length per unit per degree temperature change:

Answer 28

coefficient of linear expansion

Question 29

Which of the following statements is NOT true for a phase change?

Answer 29

In phase change, there is an accompanied change in the temperature

Question 30

What important step must be done before introducing steam to the rod placed inside the linear expansion apparatus to avoid damage to the micrometer caliper?

Answer 30

Turn on the dial of the micrometer screw such that a small gap must exist between the rod and the micrometer screw.

Question 31

What quantities can be used to measure an amount of heat?

Answer 31

Joule, Calorie, British thermal unit (Btu)

Question 32

The following are parts of the calorimeter except:

Answer 32

steam generator

Question 33

Which of the following does not belong to the group:

Answer 33

stirrer

Question 34

Given the following data, Q/m = 234.11 Cal/Kg, W/m = 980 J/Kg, what is the value of the mechanical equivalent of heat?

Answer 34

4.186 J/Cal

Question 35

When heat flow occurs between two bodies that are isolated from their surroundings, the amount of heat lost by one body must be _ the amount of heat gained by the other:

Answer 35

equal to

Question 36

Name the parts of the calorimeter:

Answer 36

stirrer, inner cup, thermometer, fiber ring, outer calorimeter