Multiple choices questions 4-
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This document contains 9 multiple choice questions testing knowledge of basic astronomy and physics concepts: 1) The first question asks which statement is valid for the gravitational constant G in Newton's law of universal gravitation. 2) The second question asks how many natural satellites Mars has. 3) The third question asks what a lightyear is used to measure.
Multiple choices questions 4-
- 1. Multiple choice exercises-4 1. This is Newton’slaw ofuniversal gravitation 𝐹 = 𝐺 ∙ 𝑚1∙𝑚2 𝑟2 . In that equationm1 and m2 denote the masses of any two objects inthe universe, r is theirin-betweendistance, Fisthe force whichmutually pullsthe two objectsand G is the gravitational constant. Whichof the followingsentencescanbe valid (Note that 1𝑁 = 𝑘𝑔 ∙ 𝑚 𝑠2 )? a. G isequal to 6.674 × 10−11 𝑁 ∙ ( 𝑚 𝑘𝑔 ) 2 . b. G isequal to 6.674 × 10−11 𝑁 ∙ ( 𝑘𝑔 𝑚 ) 2 . c. G isequal to 6.674 × 10−11 𝑚 ∙ ( 𝑁 𝑘𝑔 ) 2 . d. G isequal to 6.674 × 10−11 𝑘𝑔 ∙ ( 𝑚 𝑁 ) 2 . 2. How many natural satellitesdoesMars have? a. None b. 2 c. 5 d. 9 3. One lightyear is usedto measure… a. distance b. time c. energy 4. The moon makes a full orbit around the Earth in … a. a week b. a month c. a day 5. During the cosmic nucleogenesisofthe elements,large amounts of Neon are built up from the alpha-capture fusion processin stars. What is the numberof neutronsin the nucleusof 𝑁𝑒10 21 ? a. 10 b. 11
- 2. c. 21 d. 31 6. Iron is the heaviestelementthatcan be constructed by nuclear fusioninside the core of the stars. What is the mass numberof the Iron’s atom giventhat the isotope we are interestedin contains exactly30 neutronsand 26 electrons? a. 30 b. 56 c. 0 d. 26 7. What shape is the Earth? a. Square b. Oval c. Sphere d. Octagon 8. Day and night are caused by… a. the Earth’s rotationaroundthe Sun b. eclipses c. the Earth’s rotationon itsaxis 9. How many planetsdoesour solar systemhave? a. 10 b. 12 c. 8 d. 9