S1_Worksheets_for_grade_11._Physics_SOLUTIONS PDF

Worksheet Experience Physics Physics Grade 11 First Semester 2024-2025 Science Department EXPERIENCE PHYSICS 11/__ Name: …………………………………………………………………………………………… Multiple choice Questions 1. ………………. at...

Worksheet Experience Physics Physics Grade 11 First Semester 2024-2025 Science Department EXPERIENCE PHYSICS 11/__ Name: …………………………………………………………………………………………… Multiple choice Questions 1. ………………. atomic theory states that all the atoms of a given element are identical to one another. a. Dalton b. Bohr c. Rutherford d. Thomson 2. Every element consists of a fundamental particle known as an ……………... a. Molecules b. ions c. atom d. none 3. Dalton’s atomic theory was derived from many observations of the behavior of …………………. a. Solids b. liquids c. gases d. plasma 4. Atoms are joined, separated and recombined but not created or ……………. a. Destroyed b. created c. made d. produced 5. Atoms can bond together to form …………………... a. Molecules b. ions c. atom d. none 6. The atoms of certain elements are able to bond in different combinations called ………………... a. Allotropes b. isotopes c. ions d. none 7. Cathode rays are understood to be beams of ………………. a. Protons b. electrons c. neutrons d. none b. 8. Nucleus of the ……………………. contains protons and neutrons. a. Molecule b. proton c. atom d. neutron 9. The radius of Helium atom is ………………pm. a. 30 b. 31 c. 32 d. 33 10.The mass of the atom is entirely the number of protons and ………… in the nucleus. a. Protons b. neutrons c. electrons d. none 11.An atom is only electrically neutral if the number of electrons in orbitals ……………………the number of protons in the nucleus. a. Different b. equals c. greater d. less 12.When number of protons in an atom is not equal to electrons then it is called an …………... a. Atom b. ion c. molecule d. plasma 13.An ion has a net charge that causes it to interact with other charged particles via the ………………….. force. a. Coulomb b. gravitational c. attractive d. repulsive 14.In ………………….. bond, at least one electron from the two atoms forming the bond no longer interacts only with one nucleus. a. Ionic b. covalent c. both d. none 15.A single carbon atom can bond with ………….. hydrogen atoms to form methane. a. One b. two c. three d. four 16.Chiral molecules have the same chemical formula but a different …………. arrangement. a. Chemical b. physical c. both d. none 17.…………… bonds do not form molecules and do not have specific elemental ratio or formula. a. Ionic b. covalent c. metallic d. none 18.Every aluminum atom contributes ……… electrons to the sea of electrons. a. Two b. three c. four d. five 19.The strength of the interatomic or intermolecular interactions in a material defines the ……………………of the material. a. State b. price c. both d. none 20.Ionic solids have …………….. melting points than covalent solids or metallic solids. a. Lower b. equal c. higher d. none 21.When enough energy is added to a gas, electrons are stropped away from their atoms forming ………….. a. Solid b. liquid c. gas d. plasma 22.Gases have ……………. conductivity due to their lack of free electrons. a. High b. low c. great d. none 23.Covalent compounds are usually good electrical ……………. a. Conductors b. insulators c. semiconductors d. none  24.When any solid is subjected to an external force its……… changes as its individual particles react to that force. a. State b. shape c. temperature d. none 25.The ratio of ………………. to strain is called young’s Modulus. a. Stress b. pressure c. force d. none 26.An …………….is a mixture of two or more metals. a. Alloy b. allotrope c. both d. none 27.Ceramics are good thermal and electrical ………………... a. Conductors b. insulators c. both d. none 28. A …………….. of ceramic materials in which the molecular structure is amorphous is called glass. a. Subset b. super set c. proper set d. none 29.Carbon atoms can bond together, they are able to form …………………… chain molecules. a. Oxygen-based b. nitrogen-based c. carbon-based d. none 30. Carbon is one of the few elements that can form enough bonds to be the ……………………….. of a molecular chain. a. Strength b. weakness c. backbone d. none 31.Naturally occurring polymers include ……………… which are made of amino acids. a. Proteins b. fats c. carbohydrates d. iron 32.Elastomers display ……………………… at ambient temperature. a. Elasticity b. stress c. strain d. none 33.…………………………. can be repeatedly distorted without breaking apart. a. Polymers b. elastomers c. isomers d. none Mark the following as true or false 1. Dalton’s atomic theory states that all the atoms of a given element are identical to one another. True 2. Every element consists of a fundamental particle known as molecule. False 3. Dalton’s atomic theory was derived from many observations of the behavior of solids. False 4. Atoms are joined, separated and recombined but not created or destroyed. True 5. Atoms can bond together to form molecules. True 6. The atoms of certain elements are able to bond in different combinations called isotopes. False 7. Cathode rays are understood to be beams of electrons. True 8. Nucleus of the atom contains protons and electrons. False 9. The radius of Helium atom is 21pm. False 10.The mass of the atom is entirely the number of protons and neutrons in the nucleus. True 11.An atom is only electrically neutral if the number of neutrons in orbitals equals the number of protons in the nucleus. False 12.When number of protons in an atom is not equal to electrons then it is called an ion. True 13.An ion has a net charge that causes it to interact with other charged particles via the gravitational force. False 14.In covalent bond, at least one electron from the two atoms forming the bond no longer interacts only with one nucleus. True 15.A single carbon atom can bond with four hydrogen atoms to form ethane. False 16.Chiral molecules have the same chemical formula but a different physical arrangement. True 17.Metallic bonds do not form molecules and do not have specific elemental ratio or formula. True 18.Every aluminum atom contributes four electrons to the sea of electrons. False 19.The strength of the interatomic or intermolecular interactions in a material defines the state of the material. True 20.Ionic solids have higher melting points than covalent solids or metallic solids. True 21.When enough energy is added to a gas, electrons are stripped away from their atoms forming ions. False 22.Gases have high conductivity due to their lack of free electrons. False 23.Covalent compounds are usually good electrical insulators. True 24.When any solid is subjected to an external force its shape changes as its individual particles react to that force. True 25.The product of stress to strain is called young’s Modulus. False 26.An alloy is a mixture of two or more non-metals. False 27.Ceramics are good thermal and electrical insulators. True 28.A super set of ceramic materials in which the molecular structure is amorphous is called glass. False 29.Carbon atoms can bond together, they are able to form carbon-based chain molecules. True 30. Carbon is one of the few elements that can form enough bonds to be the backbone of a molecular chain. True 31.Naturally occurring polymers include fats which are made of amino acids. False 32.Elastomers display elasticity at ambient temperature. True 33.Elastomers can be repeatedly distorted without breaking apart. True Define the following terms: 1. Atom 2. Nucleus 3. Covalent bond 4. Electrical conductivity  5. Stress 6. Anisotropic 7. Alloy 8. Polymers 9. Agonists 10.Antagonists Answer the following: