IGKO Class 5 - Sample question paper 05
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Q51) Which layer of Earth spins at a different speed compared to the remaining layers?
a) Crust
b) Inner core
c) Outer core
d) Mantle
Answer: c) Outer core
Explanation: The outer core of the Earth is composed of liquid iron and nickel and is responsible for generating Earth's magnetic field. It spins at a different speed compared to the solid inner core and the surrounding mantle.
Q52) How many years does our solar system take to rotate around the Milky Way?
a) 100 million
b) 150 million
c) 225 million
d) 350 million
Answer: c) 225 million
Explanation: Our solar system takes approximately 225 million years to complete one full orbit around the center of the Milky Way galaxy, which is known as a galactic year or cosmic year.
Q53) Generally, satellites travel at a speed of 18,000 miles per hour. This means that they can travel the entire circumference of the Earth about ________ times in a day.
a) 10
b) 14
c) 20
d) 35
Answer: b) 14
Explanation: Satellites orbiting at a speed of 18,000 miles per hour can complete approximately 14 orbits around the Earth in a day, as the circumference of the Earth is about 24,901 miles.
Q54) What is a light-year?
a) A year with 365 days
b) The time it takes for light to travel in one year
c) A unit of time used in space travel
d) The distance light travels in one second
Answer: b) The time it takes for light to travel in one year
Explanation: A light-year is a unit of distance that represents the distance light travels in one year. It is approximately 9.46 trillion kilometers or 5.88 trillion miles.
Q55) What is the name of the phenomenon that occurs when the Sun, Earth, and Moon are in a straight line?
a) Solar eclipse
b) Lunar eclipse
c) Tidal wave
d) Full moon
Answer: a) Solar eclipse
Explanation: A solar eclipse occurs when the Moon comes between the Sun and Earth, blocking the Sun's light and casting a shadow on Earth.
Q56) What is the name of the process by which plants make their food using sunlight?
a) Photosynthesis
b) Respiration
c) Fermentation
d) Transpiration
Answer: a) Photosynthesis
Explanation: Photosynthesis is the process by which plants use sunlight, carbon dioxide, and water to produce glucose (food) and oxygen. This process is crucial for the survival of life on Earth.
Q57) What is a black hole?
a) A hole in the ozone layer
b) A region in space with no stars
c) A region in space with strong gravity that nothing can escape from, not even light
d) A region in space where time moves slower
Answer: c) A region in space with strong gravity that nothing can escape from, not even light
Explanation: A black hole is a region in space where the gravitational pull is so strong that nothing, not even light, can escape from it. It is formed when a massive star collapses under its own gravity at the end of its life.
Q58) What is the name of the natural satellite of Earth that influences tides?
a) Jupiter
b) Mars
c) Venus
d) Moon
Answer: d) Moon
Explanation: The Moon is the natural satellite of Earth that influences tides through its gravitational pull. The gravitational interaction between the Moon and Earth causes ocean tides to rise and fall.
Q59) What are auroras also known as in the Northern Hemisphere?
a) Northern Lights
b) Southern Lights
c) Polar Lights
d) Solar Lights
Answer: a) Northern Lights
Explanation: Auroras are also known as the Northern Lights in the Northern Hemisphere and the Southern Lights in the Southern Hemisphere. They are natural light displays in the sky caused by the interaction of solar wind with Earth's magnetic field.
Q60) What causes the moon to shine?
a) It produces its own light
b) It reflects the light of the stars
c) It reflects the light of the Sun
d) It emits bioluminescence
Answer: c) It reflects the light of the Sun
Explanation: The moon does not produce its own light. Instead, it shines because it reflects the light of the Sun. When sunlight falls on the moon's surface, it bounces off and reaches the Earth, making the moon appear bright in the night sky.
Q61) What percentage of total energy consumed is provided by fossil fuels?
a) 85%
b) 92%
c) 86%
d) 96%
Answer: d) 96%
Explanation: Fossil fuels provide approximately 96% of the total energy consumed. These fuels include coal, oil, and natural gas and are extensively used for various purposes like electricity generation and transportation.
Q62) What is the thickness of the Earth's atmosphere, and what gases surround it?
a) 235 kilometers, 13 gases
b) 492 kilometers, 15 gases
c) 480 kilometers, 16 gases
d) 530 kilometers, 14 gases
Answer: b) 492 kilometers, 15 gases
Explanation: The Earth's atmosphere has a thickness of approximately 492 kilometers and is surrounded by 15 gases, including nitrogen, oxygen, and trace amounts of other gases.
Q63) In which layer of the atmosphere do we live?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Exosphere
Answer: a) Troposphere
Explanation: We live in the troposphere, which is the lowest layer of the Earth's atmosphere. It is where most weather phenomena occur, and it contains the air we breathe.
Q64) What does the picture represent in terms of a natural calamity?
a) Cyclone
b) Earthquake
c) Flood
d) Fire
Answer: a) Cyclone
Explanation: The picture represents a cyclone, which is a natural calamity characterized by strong winds rotating around a low-pressure center. Cyclones can cause significant damage to property and life.
Q65) Which air purifier should not be used to avoid air pollution?
a) Aerosols
b) Nitrosols
c) Oxysols
d) Naturasols
Answer: a) Aerosols
Explanation: To avoid air pollution, aerosols should not be used as air purifiers. Aerosols are small particles suspended in the air that can contribute to air pollution when released into the atmosphere.
Q66) Which of the following is a liquid metal that is also very toxic?
a) Mercury
b) Krypton
c) Lead
d) Carbon
Answer: a) Mercury
Explanation: Mercury is a liquid metal that is also very toxic. It is used in various industrial processes, but its improper disposal and release into the environment can lead to severe health and environmental hazards.
Q67) What causes acid rain?
a) Water pollution
b) Air pollution
c) Noise pollution
d) Soil pollution
Answer: b) Air pollution
Explanation: Acid rain is caused by air pollution, particularly emissions of sulfur dioxide and nitrogen oxides that react with atmospheric moisture to form acids. These acids then fall to the ground as acid rain, which can harm plants, animals, and water bodies.
Q68) Fill in the analogy: Coal: _________:: Sand: Glass
a) Fuel
b) Painting
c) Diamond
d) None of these
Answer: d) None of these
Explanation: The analogy is not complete or related. There is no direct relationship between coal and fuel or between sand and glass. Hence, none of the options given is appropriate to complete the analogy.
Q69) Which of the following is not a method of waste disposal?
a) Reusing things as much as possible
b) Segregating wastes (dry, wet)
c) Not throwing packets out of moving cars
d) Leaving garbage bags outside neighbors' doors
Answer: d) Leaving garbage bags outside neighbors' doors
Explanation: Leaving garbage bags outside neighbors' doors is not a method of waste disposal. Proper waste disposal involves responsible methods such as reusing, recycling, composting, and utilizing waste management systems.
Q70) Which layer of the atmosphere protects the Earth from harmful _____ rays?
a) Outer layer, ultra violet rays
b) Atmospheric layer, ultra violet rays
c) Thermosphere layer, raxin layer
d) None of these
Answer: b) Atmospheric layer, ultra violet rays
Explanation: The atmospheric layer protects the Earth from harmful ultraviolet (UV) rays from the Sun. The ozone layer, located in the stratosphere, plays a crucial role in filtering out most of the Sun's harmful UV radiation.
Q71) Which sphere plays a vital role in communication?
a) Thermosphere
b) Stratosphere
c) Troposphere
d) Mesosphere
Answer: c) Troposphere
Explanation: The troposphere plays a vital role in communication as it is the lowest layer of the Earth's atmosphere where most weather occurs. It is also where radio waves and signals for communication travel efficiently due to its composition and characteristics.
Q72) What is the process of plants making their own food using sunlight, carbon dioxide, and water?
a) Photosynthesis
b) Respiration
c) Digestion
d) Decomposition
Answer: a) Photosynthesis
Explanation: Photosynthesis is the process by which plants use sunlight, carbon dioxide, and water to produce glucose (food) and oxygen.
Q73) Which of the following is a major cause of air pollution?
a) Planting more trees
b) Using public transport
c) Burning fossil fuels
d) Recycling plastic
Answer: c) Burning fossil fuels
Explanation: Burning fossil fuels releases harmful pollutants into the air, contributing to air pollution.
Q74) Which of the following is a renewable source of energy?
a) Coal
b) Natural Gas
c) Solar Power
d) Petroleum
Answer: c) Solar Power
Explanation: Solar power is obtained from the sun and is considered a renewable source of energy as it is continuously available.
Q75) Which of the following is a non-renewable resource?
a) Wind energy
b) Natural gas
c) Rainwater
d) Geothermal energy
Answer: b) Natural gas
Explanation: Natural gas is a non-renewable resource because it takes millions of years to form, and once it is used up, it cannot be easily replaced.