Homework 25th March

• Science
• Lower Secondary (Key Stage 3)

Homework 25th March

What is potential difference?

1. The resistance in a circuit
2. The flow of current
3. The amount of charge
4. The work done per unit charge

How is potential difference measured?

1. In amperes (A)
2. In ohms (Ω)
3. In coulombs (C)
4. In volts (V)

What is the potential difference across a resistor with 2 ohms and a current of 3 amperes?

1. 9 volts
2. 7 volts
3. 5 volts
4. 6 volts

How does potential difference affect current in a circuit?

1. Potential difference only affects resistance
2. Potential difference has no effect on current
3. Higher potential difference leads to lower current
4. Higher potential difference leads to higher current

What is the formula for potential difference in a circuit?

1. Potential difference = Current × Resistance
2. Potential difference = Current ÷ Resistance
3. Potential difference = Resistance ÷ Current
4. Potential difference = Current + Resistance

What is the symbol used in electrical circuits to represent current?

1. R
2. I
3. V
4. A

Which unit is used to measure electric current?

1. Ampere
2. Volt
3. Ohm
4. Watt

In which direction does conventional current flow?

1. From positive to negative
2. In both directions
3. From negative to positive
4. It depends

What does DC stand for in relation to electric current?

1. Dynamic current
2. Digital current
3. Direct current
4. Decelerating current

What material is commonly used as a conductor of electric current?

1. Copper
2. Aluminum
3. Gold
4. Silver

What is the formula for potential difference in a circuit?

1. Potential difference = Current × Resistance
2. Potential difference = Current ÷ Resistance
3. Potential difference = Resistance ÷ Current
4. Potential difference = Current + Resistance

What is the definition of an independent variable?

1. The variable that is constant.
2. The variable that is controlled.
3. The variable that is measured.
4. The variable that is manipulated or changed.

In a study investigating the impact of exercise on heart rate, what would be the independent variable?

1. The amount of exercise performed.
2. The age of the participants.
3. The heart rate measurement.
4. The duration of the study.

Which statement best describes the role of an independent variable in an experiment?

1. It is the variable that is measured.
2. It is the variable that is changed to observe its effect.
3. It is the variable that remains constant.
4. It is the variable that is controlled.

What makes an independent variable different from a dependent variable?

1. It is influenced by the independent variable.
2. It is manipulated by the researcher.
3. It is the outcome being measured.
4. It is a constant in the experiment.

What is the purpose of a resistor in an electrical circuit?

1. Storing electrical energy
2. Converting electrical energy to heat
3. Increasing the flow of electrical current
4. Limiting the flow of electrical current

What is the unit of measurement for resistance?

1. Ampere
2. Ohm
3. Volt
4. Watt

Which of the following materials is commonly used to make resistors?

1. Aluminum
2. Silver
3. Copper
4. Carbon

What happens to the current in a circuit when the resistance increases?

1. The current increases
2. The current decreases
3. The current remains the same
4. The current becomes erratic

What type of bonding involves the transfer of electrons between a metal and a non-metal?

1. Covalent bonding
2. Ionic bonding
3. Hydrogen bonding
4. Metallic bonding

In ionic bonding, what is the name for the positively charged ion formed by losing electrons?

1. Cation
2. Isotope
3. Anion
4. Neutron

Which of the following pairs typically form an ionic bond: sodium and chlorine, or hydrogen and oxygen?

1. Helium and neon
2. Sodium and chlorine
3. Carbon and nitrogen
4. Hydrogen and oxygen

What is the term for the attraction between oppositely charged ions in an ionic bond?

1. Van der Waals force
2. Electrostatic attraction
3. London dispersion
4. Dipole-dipole interaction

In an ionic bond, what is the name for the negatively charged ion formed by gaining electrons?

1. Isomer
2. Proton
3. Cation
4. Anion

What is the formula for potential difference in a circuit?

1. Potential difference = Current × Resistance
2. Potential difference = Current ÷ Resistance
3. Potential difference = Resistance ÷ Current
4. Potential difference = Current + Resistance

What type of bonding involves the sharing of delocalized electrons among a lattice of metal ions?

1. Hydrogen bonding
2. Ionic bonding
3. Covalent bonding
4. Metallic bonding

What is the primary force that holds the metal atoms together in metallic bonding?

1. London dispersion forces
2. Dipole-dipole interactions
3. Electrostatic attraction
4. Van der Waals forces

Why do metals typically have high electrical conductivity?

1. Presence of delocalized electrons
2. Formation of covalent bonds
3. Lack of valence electrons
4. Absence of free electrons

What is the sharing of electron pairs between atoms called?

1. Covalent bonding
2. Metallic bonding
3. Ionic bonding
4. Hydrogen bonding

What type of elements typically form covalent bonds?

1. Metalloids
2. Nonmetals
3. Alkali metals
4. Noble gases

In a covalent bond, what holds the atoms together?

1. Protons
2. Ionic charges
3. Neutrons
4. Shared electrons

When will Europa Clipper launch?

1. July
2. August
3. September
4. October

When will Europa Clipper arrive at its destination

1. 2025
2. 2030
3. 2035
4. 2040

How many experiments will Europa Clipper undertake?

1. 10
2. 11
3. 12
4. 14

What does SUDA stand for?

1. Space Undertaking Dust Analysis
2. Surface Uropa Dust Analyser
3. SUrface Dust Analyser
4. South underside Dust analysis

What is SUDA

1. A mass spectrometer
2. A flame spectroscopy

What will SUDA do?

1. Take photographs and send the to Earth
2. Identify chemicals and materials present on the moon.
3. Collect material ejected from the moon and bring home
4. Reveal the chemical composition of material ejected from the moon