Test: Class 9 Science: CBSE Sample Question Paper Term I - 1 - Class 9 MCQ

The Tyndall effect is the scattering of light as a light beam passes through a colloid. The individual suspension particles scatter and reflect light, making the beam visible. Milk, tincture iodine, and the white part of the egg show the Tyndall effect whereas salt solution did not show the Tyndall effect.

The heart of human beings is made up of cardiac muscles which are different from smooth and skeletal muscles. Inside the cardiac muscles are the intercalated discs which are known to join various adjacent cells together. There are a number of functions of intercalated discs. It is only when it functions properly that the heart can work effectively.

Tendons are white fibrous connective tissues having great strength and join skeletal muscles with bones.

Let the radius of circular path be r and 3r respectively.
Let the speed of first and second objects be v₁ and v₂ respectively.
The length of the first track = 2πr
Time is taken by the first object = 2πr/v₁
The length of the second track = 2πr(3r) = 6 πr
Time is taken by the second object t = 6πr/v₂
Time taken by both object are the same

Internal forces are those forces which are exerted on each other when the bodies are part of the system. The forces acting between the atoms of molecules that keep them together are an example of internal force.

A clear filtrate and no residue in A, translucent filtrate and no residue in B, solid particles as residue and clear filtrate in C.

Vacuoles occupy a very large part of the cell volume in plants. Upton 95% of cellular volume can be occupied by them.

The cells do not have a cell wall. However, each cell has a thin cell membrane. A large vacuole is present at the center of each cell and is surrounded by the cytoplasm. A lightly stained cytoplasm is observed in each cell. A deeply stained nucleus is observed at the center of each cell.

If a body covers equal distance in equal intervals of time then it is said to be moving at a uniform speed. Mathematically speed is defined as v = S/t , where v is the speed of the object, S is the distance covered and t is the time taken.

Newton's first law of motion is also referred to as the Law of Inertia. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Sublimation is the phase transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase.

A.V. Leeuwenhoek in 1674 with the improved microscope, discovered free-living cells of algae Spirogyra in pond water for the first time.

Complex tissue consists of different types of cells carrying out the same function. They help in the transportation of organic material, water, and minerals. In plants, xylem and phloem are examples of complex tissues.

Inertia is directly proportional to mass, hence all the above given objects will have equal inertia.

i. Friction is the force that makes it difficult for one object to slide along the surface of another.
ii. The limiting friction is the frictional force just sufficient to move the object.
iii. Sliding friction refers to the resistance created by two objects sliding against each other.
iv. Rolling friction refers to the resistance created by an object rolling across a surface.

Place a slice of a potato on a paper towel at top of a paper plate and add a drop of the iodine solution to the potato slice. Note the color change. A change of color to blue-black or purple color suggests that starch is present. If there is no change in color, this suggests no starch is detectable.

Since kidney is a part of an animal cell so chloroplast is absent.

Smooth muscle has spindle-shaped, non-striated, uninucleated fibers and occurs in walls of internal organs. It is involuntary in action.

• When a body moves from one position to another, the shortest (straight line) distance between the initial position and final position of the body is known as its displacement. It's a vector quantity.
• Displacement can be zero, less than the magnitude of distance but can never be more than the magnitude of distance covered.

For the first body, F = m₁a₁ 

For second body, F = m₂a₂ 

Combined mass of both bodies, m₁ + m₂  

F = 5N, a = ?
F = ma

So, a = 6m/s² 

Egg albumin in water will not give a stable solution. The protein in egg albumin coagulated to form a lump in hot water.

RBC is called as red blood corpuscles. Red Blood Cells in mammals anucleate when mature i.e. they do not contain a nucleus. This is so that the cell has maximum space for haemoglobin.

The staining of the peel must be appropriate. Excess stain can be removed by rinsing the peel with water taken in the watch glass. The extra stain from the slide if present is removed by soaking with filter paper. Filter paper absorbs the excess water and stain.

Relation among velocity, distance, time, and acceleration is called equations of motion. There are three equations of motion. Equation of motion can be used for a body having uniform acceleration.

The object moving along a straight path with an accelerated motion has changing velocity, speed and mass.

Cells are enclosed by a plasma membrane composed of proteins and lipids. It separates the contents of the cell from the external environment. It permits entry of selective substances in the cell. It allows exit of selective substances from the cell.
Tonoplast is the membrane which bounds the chief vacuole of a plant cell. It is also known as the vacuolar membrane. It separates the vacuolar contents from the cytoplasm of the cell.
Stroma is the ground material of chloroplast. It is the part of a tissue or an organ that has a connective and structural role.
Each of the partial partitions in a mitochondrion formed by infolding of the inner membrane is known as Cristae.

The cork is impervious to water due to suberin deposition in the cell wall of its cells. The walls of cork cells are heavily thickened with an organic substance, suberin. Suberin makes these cells impervious to water and gases.

Protection of inner parts of leaves, exchange of gases, and regulation of water is done by the upper and lower layers of cells while photosynthesis is done in the mesophyll.

The human cheek cell is an animal cell with an outermost membrane as plasma membrane.

Uniform motion is the kind of motion in which a body covers equal distances in equal intervals of time.
For example B, C, and D, the bodies cover equal distances in equal intervals of time.