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pec canvas > quiz 1 questions > Flashcards

quiz 1 questions Flashcards

1
Q

The amount of energy needed to change a given mass of ice to water at constant temperature is called the heat of

A

fusion

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2
Q

Other term for noble gas

A

inert gas

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3
Q

Find the mass in grams of 2.5 moles of Sulfuric acid ( H2SO4) with atomic weight of H=1 amu, S= 32 amu and O= 16 amu?

A
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4
Q

Which of the following is not a pure substance?

  • water
  • oxygen
  • copper
  • milk
A

milk

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5
Q

What do you to a process of phase change from solid to gas?

A

sublimation

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6
Q

What if the pH reading of 0.01 X 10-3 positive Hydronium ion solution?

A

pH 5

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7
Q

A state of matter in gaseous super fluid form that usually occurs at ultra low temperature?

A

Bose- Einstein condesate

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8
Q

Which among the crystal system has the least symmetry due to its unequal unit cell dimensions and angles?

A

triclinic

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9
Q

If Aurium has 106.97 g/mol atomic weight, how many carat does it has on 0.03 moles?
24 K

A
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10
Q

Which of the following describes a chemical change?
Water boiling to form steam

  • Hamburger grease solidifying on a plate
  • Tarnishing silver
  • Sugar dissolving in a cup of coffee
A

tarnishing silver

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11
Q

The SI unit of “time” was derived on which reference element?

A

Cesium

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12
Q

What is the molecular weight of water?

A

18 g/mo

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13
Q

Calculate the mass of the oxygen that reacts with 1.24 g of methane to form 3.41 g of Carbon dioxide and 2.79 g of water?

A
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14
Q

It is refer to the ratio of number of moles of solute in a kilogram of solvent?

A

molality

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15
Q

An atom which has the greatest ability to attract electron is

A

chlorine

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16
Q

If the siren is moving away from the listener with a speed of 45 m/s relative to the air and the listener is moving toward the siren with a speed of 15 m/s relative to the air, what frequency does the listener hear if the siren emitted a 300 Hz frequency?

A

277

17
Q

What is the weight of a 10 kg mass located at a place where gravitational acceleration is 9.77 m/s^2

A

97.7

18
Q

Given an object which starts from position x=0 and moves along a straight line with position given by x = 20t - 5t^3

Determine the time at which the velocity is zero.

A
19
Q

What is the final temperature of the fluid having a volume of 1 Liter if the initial volume is 300mL at 70 o C considering an Isobaric process?

A
20
Q

A 16 g mass is moving at 30 cm/s while a 4 g mass moving at 50 cm/s in opposite direction collide and stuck together, what is the final velocity?

A

0.14

21
Q

An aircraft engine developed a forward thrust of 15 kN, if the gross mass of aircraft is 100 tons and flying at the speed of 1000 kph, calculate the horse power rating of the engine?

A

5585

22
Q

A net force of 100 N is applied to a 5 kg mass that is initially at rest. After 10 seconds, the body would have traveled a distance of ?

A

1000m

23
Q

You are designing an electronic circuit element made of 23 mg of silicon. The electric current through it adds energy at the rate of 7.4 mW. If your design doesn’t allow any heat transfer out of the element, at what rate does its temperature increase? The specific heat of silicon is 705 J/kg•K.

A
24
Q

A 2 kilograms body is held 4 meters above the ground. What is the approximate speed of the mass when hitting the ground?

A

7.86

25
Q

It is a quantity which is the product of axial force and its distance from a reference point?

A

modulus

26
Q

Mariel and his father Leiram are on a seesaw 5 meters long and the fixed at the center. If Mariel is 25 kg and is at one end of the seesaw, where should his 50 kg father sit on the other side so he could balance the seesaw?

A
27
Q

A 10 kg object stay at rest at the height of 100 ft, what is the velocity at the distance 50 ft above the ground?

A
28
Q

What is the largest angle they made by three forces 20 N, 30 N and 40 N under equilibrium?

A

pec canvas (6 decks)

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