Test: Basic Science- 2 - Class 5 MCQ

Burning of paper is a chemical change because it is irreversible.

Lysosomes are called suicide sacks. They are produced by the Golgi body. They consist of a single membrane surrounding powerful digestive enzymes. It acts as the "garbage disposal" of the cell by breaking down cell components that are no longer needed as well as molecules or even bacteria that are ingested by the cell.

Unstable equilibrium is a state of equilibrium in which a small disturbance will produce a large change.
Hence, a ball balanced on a vertical rod is an example of unstable equilibrium

The acceleration due to gravity g is independent of the mass m of an object. Hence, if the other forces like the air resistance are neglected as in the case of a vacuum, The time t₁​,t₂​ and t₃​ for a five-rupee coin, a feather of a sparrow bird and a mango respectively to reach the ground if dropped simultaneously from the same height will be same.
Thus, we get t₁​ = t₂ ​= t₃​.

Mass of a body is an intrinsic property which is same everywhere.

Gravitational force is not same for all pairs of bodies in our universe. It depends on their masses and distance between them.

The Geiger counter, an instrument used for detecting and measuring ionizing radiation is used widely in applications such as radiological protection, experimental physics and the nuclear industry. The Geiger–Müller tube or GM tube is the sensing element of the Geiger counter instrument. It is named after the scientists Hans Geiger and Walther Müller.

The major component in the rigid cell walls in plants is cellulose. In the primary (growing) plant cell wall, the major carbohydrates are cellulose, hemicellulose, and pectin. Cellulose from major land and forest plants and cotton is assembled from glucose, which is produced in the living plant cell from photosynthesis. In the oceans, however, most cellulose is produced by unicellular plankton or algae using the same type of carbon dioxide fixation found in photosynthesis of land plants.

Physical change is a change in which nothing new is formed. It is a change which only affects the form of a substance, but not it's chemical composition. Such kind of change is reversible. For example melting of ice, freezing of water etc.

Anemometer is a wind speed measuring device and direction device generally deployed in weather stations to measure and report data.

The basic element of all organic compounds is Carbon. And they are called organic because they associate with living organisms. 
So the correct option is 'carbon'.

Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance or shape occupies or contains. Graduated cylinder, measuring cylinder or mixing cylinder is a common piece of laboratory equipment used to measure the volume of a liquid. It has a narrow cylindrical shape.

Natural vegetation is the true index of climate because water loving plants are found in moist climate.

Forests are renewable natural resources and enhance the quality of environment by providing the Oxygen needed to sustain life on the earth. Although both assertion and reason are correct statements but reason is not the correct explanation of the assertion.

As an ecosystem, wetlands are useful for nutrient recovery and cycling, releasing heavy metals through absorption by plants. They also control floods and maintain floods.