Model Test Paper - 1 - Class 6 MCQ

• Stored reserves: Underground stems (like tubers or bulbs) contain stored starch and nutrients.

• First nourishment: Before the new leaves can make food by photosynthesis, the shoot uses those reserves.

• Role of roots and buds:

  • The buds are the growth points but don’t provide food.

  • The roots later absorb water and minerals but the first food comes from the stem’s stored reserves.

• Vitamins keep us healthy: Each vitamin has a special job in the body.

• Vitamin B₁ and beriberi: If we don’t get enough vitamin B₁ (thiamine), we can get beriberi—our muscles feel weak and we may swell up.

• Other mismatches:

  • Lack of vitamin A causes night blindness, not rickets.

  • Lack of vitamin C causes scurvy (bleeding gums), not goiter.

  • Lack of vitamin D causes rickets (soft, weak bones), not anaemia.

The correct choice is A.

• Spinning is the process being depicted in the image.
• Spinning is the process of turning fluffy fibres (like cotton or wool) into a long, strong thread that can be used for weaving cloth.

• The fiber in the image is Jute
• Jute is a long, soft, shiny vegetable fiber used for making rope and burlap.

• Crimp refers to the natural waviness of wool fibers.
• This waviness makes woolen yarns lofty and bulky.
• The tiny air pockets trapped by the crimp act as insulation, helping woolen fabrics keep us warm.

• Filtration is the method of using a porous barrier (filter paper) to separate insoluble solids from a liquid.

• In the diagram, the liquid (filtrate) passes through the filter paper, while the solid residue remains on top.

• Sedimentation is simply letting solids settle without a filter, and evaporation removes the solvent to leave dissolved solids behind—neither of which match the picture. Only Option A correctly names the process shown.

Sublimation is the process where a substance changes directly from a solid to a gas without becoming liquid. The substance that exhibits this behaviour is:

• Naphthalene

It is commonly used in mothballs and is known for its ability to sublimate easily at room temperature.

• Cooking rice is an example of an irreversible and endothermic change.
• This means that when rice is cooked, it undergoes a transformation that cannot be reversed.
• During this process, rice absorbs heat and moisture, leading to physical and chemical changes that alter its structure and properties.

Iron rusts due to its reaction with moisture in the air. Here are the key points:

• Moisture in the atmosphere interacts with iron, leading to rust formation.
• Iron is considered a weak material, making it prone to this reaction.
• It is an unstable material, which contributes to its rusting.
• Rusting is an intrinsic property of iron, meaning it is a natural tendency.

Some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions.

The correct option is Option B.

• The way in which the leaves are arranged on a stem is called phyllotaxy.
• When only one leaf arises from a node, and leaves are borne along the stem alternately, it is called alternate phyllotaxy.
• When two leaves arise from one node, opposite to each other it is called opposite phyllotaxy.
• When a plant has several leaves attached to the same node, in a whorl it is called whorled phyllotaxy.

So, X : Whorled, Y : Opposite, Z : Alternate

The features of the plant indicate its adaptation to an aquatic environment. This is evident from the following characteristics:

• Short roots help in anchoring the plant in soft substrates.
• Long and narrow stems facilitate movement through water.
• Presence of air spaces in the stems aids in buoyancy.
• A waxy upper surface reduces water loss.

All these traits suggest that the plant thrives in water, making it suitable for an aquatic habitat.

A virus is a small infectious agent, smaller than bacteria, that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea.

According to the question 1 cm scale is divided into 20 equal divisions.
20 division = 1 cm
1 division = 1/20cm
= 0.05 cm
= 0.05×10 mm
= 0.5 mm
So, the least count of the scale is 0.5 mm

The motion of a soldier's arm while marching can be described as:

• Oscillatory: This means the arm moves back and forth in a regular pattern.
• Non-periodic: The motion does not repeat at regular intervals.
• Rotatory: This would imply a circular movement around a point, which is not accurate for arm movement while marching.
• Circular: This suggests a complete circular path, which does not apply to the typical arm motion in marching.

In summary, the most fitting description of the arm's motion when a soldier marches is oscillatory, as it involves a repetitive back-and-forth movement. Other terms do not accurately capture this specific action.

When using a symbol for a unit of a physical quantity, follow these guidelines:

• The symbol should be written in full if necessary.
• If the symbol is named after a scientist, it must start with a capital letter.
• Symbols do not take plural forms.
• They should generally be written in lowercase unless specified otherwise.

The apparent position of the opaque centre in a solid, transparent sphere appears to be:

• Closer to the eye than its actual position.
• This occurs due to the refraction of light as it passes through the sphere.
• The transparent material bends light, making the centre seem nearer.

Thus, the correct interpretation is that the dot appears to be at a different position than it truly is due to optical effects.

To solve this question, let's analyze the shadow's behavior based on the time of day:

• At 8 a.m., the sun is in the east, so the shadow of the flat is cast to the west, as shown in the image.
• By 6:30 p.m., the sun will be setting in the west, so the shadow would be cast in the opposite direction, toward the east.

Given this understanding, we need to find an option where the shadow extends to the right (east) of the flat, assuming that the front of the flat in the image is facing north.

The correct answer is: a

In option (a), the shadow extends in the opposite direction of the morning shadow, consistent with the position of the sun at 6:30 p.m.

• The mariner's compass is based on the property that a magnet rests in a north-south direction, always.
• This characteristic ensures that the compass needle will point towards the Earth's magnetic poles, providing navigators with a reliable reference for orientation.

A freely suspended bar magnet always points in north−south direction. The end that points towards north direction is the north pole of the magnet while the end that points towards south direction is the south pole of the magnet.

The materials that create strong magnets include:

• Pure iron
• Steel
• An alloy of aluminium, cobalt, nickel, and iron

These components work together to enhance magnetic properties, making them effective in various applications.

The term for water seepage into the ground is known as infiltration. To find this word, you can rearrange the letters from option C: Aitfinlronit.

Option 'B' is correct.

The actions that help in reducing pollution include:

• Restricting smoking in public areas to improve air quality.
• Treating sewage to remove human waste, preventing water pollution.
• Using unleaded petrol in cars to reduce harmful emissions.

Spraying pesticides on plants can actually increase pollution, so it is not a suitable action for reducing pollution.

Precipitation refers to any form of water, liquid or solid, that falls from the atmosphere to the Earth's surface. Common forms of precipitation include:

• Snow: Ice crystals that form in clouds and fall to the ground.
• Rain: Liquid water droplets that fall when clouds become saturated.
• Hailstone: Balls or irregular lumps of ice that form in strong thunderstorms.

Since all the listed options are forms of precipitation, the correct interpretation is that there are no options that are not precipitation. Therefore, the statement that none of them is a form of precipitation is accurate.