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MCQOPTIONS
This section includes 2268 Mcqs, each offering curated multiple-choice questions to sharpen your Grade7 knowledge and support exam preparation. Choose a topic below to get started.
| 1701. |
Tar is a chemical in a cigarette that causes |
| A. | asthma |
| B. | dizziness |
| C. | cancer |
| D. | addiction |
| Answer» D. addiction | |
| 1702. |
The number of chemicals found in a cigarette is |
| A. | 100 |
| B. | 200 |
| C. | 300 |
| D. | 400 |
| Answer» D. 400 | |
| 1703. |
The positive electrical charges of protons are balanced by |
| A. | photons |
| B. | neutrons |
| C. | electrons |
| D. | positrons |
| Answer» D. positrons | |
| 1704. |
Ion with positive charge is known as |
| A. | cation |
| B. | anion |
| C. | positron |
| D. | negatron |
| Answer» B. anion | |
| 1705. |
The orbits on which electrons revolve around the nucleus are called |
| A. | layers |
| B. | shells |
| C. | subshells |
| D. | atom |
| Answer» C. subshells | |
| 1706. |
'Nucleus' is surrounded by |
| A. | electrons |
| B. | protons |
| C. | neutrons |
| D. | electrons and protons |
| Answer» B. protons | |
| 1707. |
Scientists name isotopes by putting |
| A. | atomic number after the element name |
| B. | mass number after the element name |
| C. | atomic number before the element name |
| D. | mass number before the element name |
| Answer» C. atomic number before the element name | |
| 1708. |
Besides milky way, there are |
| A. | hundreds of other galaxies |
| B. | thousands of other galaxies |
| C. | millions of other galaxies |
| D. | gazillion of other galaxies |
| Answer» D. gazillion of other galaxies | |
| 1709. |
The 'galaxies' are extremely |
| A. | hot |
| B. | far apart |
| C. | close |
| D. | cold |
| Answer» C. close | |
| 1710. |
In 1779, Edward pigott discovered a galaxy named |
| A. | Black eye galaxy |
| B. | Evil eye galaxy |
| C. | Whirlpool galaxy |
| D. | Andromeda galaxy |
| Answer» C. Whirlpool galaxy | |
| 1711. |
Electrical signals are used to make radio |
| A. | spectrum |
| B. | frames |
| C. | images |
| D. | station |
| Answer» D. station | |
| 1712. |
A reflecting telescope can collect light from a |
| A. | faint object |
| B. | close object |
| C. | black object |
| D. | white object |
| Answer» B. close object | |
| 1713. |
Wires are heated when they carry |
| A. | electrons |
| B. | protons |
| C. | ions |
| D. | photons |
| Answer» B. protons | |
| 1714. |
The starting point of manufacturing a product which contains sodium or chlorine is |
| A. | sodium chloride |
| B. | sodium metal |
| C. | chlorine gas |
| D. | chlorine sodiumide |
| Answer» B. sodium metal | |
| 1715. |
Resistors are of |
| A. | one kind |
| B. | two kinds |
| C. | three kinds |
| D. | four kinds |
| Answer» C. three kinds | |
| 1716. |
If we add a fuse of 13A in a hair drier that requires a current of 2A, the current will cause |
| A. | overheating only |
| B. | melting of wires |
| C. | glowing of wires |
| D. | a lot of damage which may result in fire |
| Answer» E. | |
| 1717. |
The higher the voltage, the more |
| A. | force to each electron |
| B. | power to each proton |
| C. | energy to each proton |
| D. | energy to each electron |
| Answer» E. | |
| 1718. |
The blood has to distribute among all the cells of a body by arteries so they are divided into millions of tiny |
| A. | arteries |
| B. | veins |
| C. | capillaries |
| D. | nerves |
| Answer» D. nerves | |
| 1719. |
The yellow liquid in the blood is known as |
| A. | plasma |
| B. | hemoglobin |
| C. | fibrin |
| D. | fibrinogen |
| Answer» B. hemoglobin | |
| 1720. |
Oxygenated blood is carried by |
| A. | arteries |
| B. | veins |
| C. | capillaries |
| D. | intestines |
| Answer» B. veins | |
| 1721. |
The cells that make the color of blood "Red" are known as |
| A. | white blood cells |
| B. | platelets |
| C. | red blood cells |
| D. | antigens |
| Answer» D. antigens | |
| 1722. |
Each atrium and ventricle is separated by |
| A. | net of tissues |
| B. | bones |
| C. | muscles |
| D. | skin |
| Answer» D. skin | |
| 1723. |
In 1 mm3, there are |
| A. | 4000 white blood cells |
| B. | 5000 white blood cells |
| C. | 6000 white blood cells |
| D. | 7000 white blood cells |
| Answer» D. 7000 white blood cells | |
| 1724. |
If oxygen diffusion in a human is low, the disease will be |
| A. | hemophilia |
| B. | anemia |
| C. | thrombosis |
| D. | varicose veins |
| Answer» C. thrombosis | |
| 1725. |
The general treatment for the pacemaker disease is |
| A. | shock machine |
| B. | artificial pacemaker |
| C. | alternative current |
| D. | direct current |
| Answer» C. alternative current | |
| 1726. |
'Hormones' in the blood are carried by |
| A. | red blood cells |
| B. | white blood cells |
| C. | plasma |
| D. | platelets |
| Answer» D. platelets | |
| 1727. |
The 'heart' is placed |
| A. | in the center of chest |
| B. | under left rib |
| C. | under right rib |
| D. | at left side of liver |
| Answer» B. under left rib | |
| 1728. |
The representation of an object, system or phenomenon is done by |
| A. | scientific model |
| B. | key model |
| C. | atomic model |
| D. | role model |
| Answer» B. key model | |
| 1729. |
Molecules which consists of fixed number of different types of atoms which are chemically combined together, are |
| A. | elements |
| B. | compounds |
| C. | mixtures |
| D. | liquids |
| Answer» C. mixtures | |
| 1730. |
If an atom loses electron the ion obtained is charged |
| A. | positively |
| B. | negatively |
| C. | neutral |
| D. | null charge |
| Answer» B. negatively | |
| 1731. |
We see yellow color on the screen because |
| A. | red and blue dots shine more than green dots |
| B. | green and red dots shine more than blue dots |
| C. | green and blue dots shine more than red dots |
| D. | dots shine at the same rate |
| Answer» C. green and blue dots shine more than red dots | |
| 1732. |
A 'green filter' would |
| A. | allow only green color to pass |
| B. | allow red and blue to pass |
| C. | allow green color and its components to pass |
| D. | allow all colors except green |
| Answer» B. allow red and blue to pass | |
| 1733. |
When a beam of white light is refracted, it spreads into |
| A. | five colors |
| B. | six colors |
| C. | seven colors |
| D. | nine colors |
| Answer» D. nine colors | |
| 1734. |
The critical angle for diamond is |
| A. | 20 degree |
| B. | 22 degree |
| C. | 24 degree |
| D. | 26 degree |
| Answer» D. 26 degree | |
| 1735. |
'Rainbows' can only be seen when the sun |
| A. | has hidden behind clouds |
| B. | is shining |
| C. | has hidden behind mountains |
| D. | has set |
| Answer» C. has hidden behind mountains | |
| 1736. |
The resistor of a variable resistor can be changed hence it is called |
| A. | ammeter |
| B. | rheostat |
| C. | fixed resistor |
| D. | variable resistor |
| Answer» C. fixed resistor | |
| 1737. |
The instrument which is used to measure electric current is called |
| A. | ammeter |
| B. | cell |
| C. | battery |
| D. | galvanometer |
| Answer» B. cell | |
| 1738. |
If a high current passes through someone, there will be an |
| A. | electric circuit |
| B. | electric current |
| C. | electric energy |
| D. | electric shock |
| Answer» E. | |
| 1739. |
If more resistors are added in a series circuit the resistance will be |
| A. | increased |
| B. | decreased |
| C. | equal |
| D. | constant |
| Answer» B. decreased | |
| 1740. |
A positive terminal and a negative terminal are present in a |
| A. | cell |
| B. | battery |
| C. | circuit |
| D. | bulb |
| Answer» C. circuit | |
| 1741. |
The main disadvantage of series circuit is that if flow of current breaks in one part the whole circuit may |
| A. | break |
| B. | split |
| C. | fuse |
| D. | demolish |
| Answer» B. split | |
| 1742. |
Electrical energy is a form of energy which involves the flow of electric |
| A. | circuit |
| B. | current |
| C. | charges |
| D. | cell |
| Answer» D. cell | |
| 1743. |
The open circuit is a circuit in which the flow of current is |
| A. | broken |
| B. | continuous |
| C. | steady |
| D. | fast |
| Answer» B. continuous | |
| 1744. |
The current which flows through each component of a series circuit is |
| A. | same |
| B. | different |
| C. | greater |
| D. | lesser |
| Answer» B. different | |
| 1745. |
Ammeter should be connected to measure current flow in the |
| A. | series circuit |
| B. | parallel circuit |
| C. | open circuit |
| D. | close circuit |
| Answer» B. parallel circuit | |
| 1746. |
Electrical insulators have resistance which is |
| A. | high |
| B. | low |
| C. | constant |
| D. | all of them |
| Answer» B. low | |
| 1747. |
The number of neutrons in carbon-14 is |
| A. | 7 |
| B. | 8 |
| C. | 9 |
| D. | 14 |
| Answer» C. 9 | |
| 1748. |
Electrons fill energy level starting from the |
| A. | lowest level |
| B. | highest level |
| C. | central level |
| D. | upper level |
| Answer» B. highest level | |
| 1749. |
One molecule of water is made up of |
| A. | one oxygen and one hydrogen atom |
| B. | one oxygen and two hydrogen atoms |
| C. | two oxygen and one hydrogen atom |
| D. | two oxygen and two hydrogen atoms |
| Answer» C. two oxygen and one hydrogen atom | |
| 1750. |
Carbon is represented by |
| A. | C |
| B. | Na |
| C. | K |
| D. | Mg |
| Answer» B. Na | |