Answer: (c) Liquid, Solid, Gas

Explanation: There are three main states of any matter, which are solid-state, liquid state, and gaseous state. Matters can change their states from one state to another state. For example, Ice.

Answer: (a) Solid

Explanation: There are three main states of matter: solid, liquid, and gas. In solid state, the intermolecular force of attraction is maximum in comparison to liquid or gas.

Answer: (a) Sublimation

Explanation: The process by which solid is converted into gas is called sublimation. Vaporization is the process by which liquid is converted into gas. The deposition is the process by which gas is converted into solid.

Answer: (a) Fusion

Explanation: The process by which liquid is converted into solid is called fusion. In this process, the intermolecular force increases, so the density is increased.

Answer: (b) Two

Explanation: There are two types of mixtures present in nature: “homogeneous” and “heterogeneous”. Homogeneous are those mixtures in which solute is completely mixed with a solvent. Heterogeneous refers to those mixtures in which solute is not mixed with a solvent.

Answer: (b) Solvent

Explanation: There are two types of substance present in the solution: “Solvent” and “Solute”. A solution contains a large quantity of solvent and a small quantity of solute.

Answer: (c) Fractional Distillation

Explanation: The process by which we can obtain various gases from the air is fractional distillation. In this process, we distill the air at different temperatures.

Answer: (d) Proust

Explanation: Joseph Proust gives the law of constant proportion. According to Joseph Proust, elements in a chemical-substance are always present in definite proportions by mass.

Answer: (d) 11

Explanation: The atomic number and mass of sodium (Na) are 11 and 23, respectively. The sodium (Na) comes in the category of alkali metal, so its valency is 1.

Answer: (b) MgCl₂

Explanation: The chemical formula of magnesium chloride is MgCl₂. Magnesium has a valency of 2, and chloride has 1. Therefore, two atoms of chloride and one atom of magnesium together make magnesium chloride.

Answer: (d) 18

Explanation: The molecular-mass of hydrogen is one, and the molecular-mass of oxygen is 16. In the water, there are two moles of hydrogen and 1 mole of oxygen. So, the total molecular mass of water is 18 (1 + 1 + 16 = 18).

Answer: (b) Watermelon Model

Explanation: Thomson’s model’s second name is the watermelon model because this model looks like a watermelon.

Answer: (d) 0

Explanation: Neutrons have neither negative nor positive charge elements. It is neutral, so the charge on the neutron is zero.

Answer: (c) 2

Explanation: The valency of oxygen is 2. Its molecular number is eight, so there are 6 electrons in its outermost shell. It needs two more electrons to complete its outermost shell, so it has a valency of 2.

Answer: (c) Cell

Explanation: The basic or structural unit of the human body is the cell. It consists of a nucleus and many other cell organelles. It is divided by mitosis and meiosis.

Answer: (b) Cellulose

Explanation: The cell wall of the plant is mainly composed of cellulose. It makes the cell of the plant hard and gives strength to the plants.

Answer: (b) Lysosome

Explanation: Lysosome is also called the suicide bag. Because it gets bursts and digests itself, it is present outside the nucleus in the cell.

Answer: (a) Parenchyma, Collenchyma, Sclerenchyma

Explanation: There are mainly three simple permanent tissues: Parenchyma, Collenchyma, Sclerenchyma. These permanent tissues help in the development of plants.

Answer: (d) Xylem, Phloem

Explanation: There are two complex-permanent-tissues present in plants: Xylem and Phloem. These tissues help in the transfer of water and minerals to plants.

Answer: (d) Four

Explanation: There are four types of tissues found in the human body, and these are nervous, epithelial, connective, and muscle tissue.

Answer: (d) Neuron

Explanation: The unit of the nervous tissue is the neuron. It helps in transmitting the signals. It consists of dendrites that make contact with the axon of the next neuron.

Answer: (c) Protista

Explanation: Paramecium belongs to the Protista species because it is unicellular. It contains cilia which help in the motion of the Paramecium.

Answer: (d) Porifera

Explanation: Porifera is a species that is prokaryotes as well as unicellular. The best examples of these species are bacteria and archaea.

Answer: (c) Pteridophyta

Explanation: Fern is related to pteridophyte species. These species have different leaves and branches. But there is no seed in the plants of this species.

Answer: (a) Thallophyta

Explanation: The species of plants that have not differentiated the plant’s part is thallophyta. Their body is whole and not differentiated into body parts.

Answer: (b) Distance / Time

Explanation: The formula of speed is distance / time, and it is defined as the distance traveled per unit time. The S.I unit of the speed is m/s.

Answer: (b) m / s²

Explanation: The S.I unit of acceleration is m/s2. It is defined as the change in speed per unit time.

Answer: (c) ½ m/s

Explanation: We know that

speed = distance / time.

In this case, the distance travelled is 5 meter and time is 10 sec so speed is 5 / 10 = 1 / 2 m/s.

Answer: (b) 0

Explanation: The correct answer is 0. In this case, the man starts from home and returns home again, so the total displacement is 0, and the velocity is also zero.

Answer: (d) Newton

Explanation: The S.I unit of force is the newton. Force is defined as mass * acceleration. The S.I unit of mass is kg. The S.I unit of acceleration is m/s². So, the unit of force is kg * m/s² which is equal to newton.

Answer: (c) 3

Explanation: Newton gives three laws of motion. The first law of motion is inertia, the second law is the change in momentum, and the third law is action-reaction.

Answer: (d) p = mv

Explanation: The formula of momentum is p = mv. Where, m = mass and v = velocity. Momentum is equal to mass * velocity. So, it is equal to the applied force.

Answer: (a) F = G * Mm / r²

Explanation: Gravitational force is directly proportional to both the particles’ mass, and it is inversely proportional to the square of the distance. So, it is equal to F = G * Mm / r².

Answer: (b) 9.8 m / s²

Explanation: The value of gravitational acceleration (g) is 9.8 m / s². It is the force applied to the unit mass that falls freely by the Earth.

Answer: (c) Pascal

Explanation: The S.I unit of pressure is the pascal. It is equal to the force per unit area. A pascal is defined as the unit force applied to the unit area.

Answer: (b) Joule

Explanation: The S.I unit of work is the joule. Work is equal to force into displacement. One joule is equal to unit force which gives the unit displacement.

Answer: (b) K.E = 1 / 2 MV²

Explanation: The formula of kinetic energy is KE = 1 / 2 MV². Where, M = mass, V = velocity. This is the energy due to the motion of an object.

Answer: (d) P.E = m * g * h

Explanation: The formula of potential energy is PE = m * g * h. Where, M = mass, g = acceleration due to gravity, h = height. This is energy due to the statics of the object.

Answer: (a) Watt

Explanation: The S.I unit of power is the watt. It is defined as work per unit time. One unit power is equal to unit work done per unit time.

Answer: (a) Longitudinal

Explanation: The nature of sound waves is longitudinal. A sound wave needs a medium for its transmission. So, it travels with the help of particles of the medium.

Answer: (c) A wave carries the maximum distance from its equilibrium position.

Explanation: The wave’s amplitude is the maximum distance or displacement traveled by a wave from its equilibrium position. So, it determines the magnitude of the wave.

Answer: (c) Hertz

Explanation: The S.I unit of frequency of the sound wave is hertz. Frequency is the cycle per unit time. It is mentioned by hertz. So, its S.I unit is hertz.

Answer: (b) 20HZ to 20KHZ

Explanation: The range of hearing of a human’s ear is 20HZ to 20KHZ. The human’s ear is not able to hear the sound beyond this range. The sound below 20HZ is called hypotonic sound, and a sound above 20KHZ is called hypertonic sound.

Answer: (d) Lichens

Explanation: The species which give the indication of the quality of air pollution are lichens. Lichens become black in polluted places. So, by changing its color, it gives the indication of pollution.

Answer: (b) Farming of hens

Explanation: The farming of hens is called poultry farming. In this type of farming, hens are domesticated. These hens are used for the production of eggs. It is also used in meat production.

Answer: (b) (Solute mass / Solution mass) * 100

Explanation: None