The correct answer is: (c) Both (A) and (B)

Explanation:

• Statement A – Correct:
  Alzheimer’s disease is a neurodegenerative disorder that leads to progressive loss of memory and cognitive function. It is the most common cause of dementia.

• Statement B – Correct:
  Dementia is not a single disease, but a syndrome – a group of symptoms affecting memory, thinking, and social abilities. It can be caused by various conditions, including Alzheimer’s, Parkinson’s, and stroke.

Information Booster:

• Alzheimer’s is responsible for 60–70% of dementia cases worldwide.

• Symptoms include confusion, disorientation, language problems, and personality changes.

• Dementia can be reversible in some cases (e.g., due to vitamin deficiencies or thyroid issues).

• Alzheimer’s has no cure, but treatment can manage symptoms.

• Risk factors include age, genetics, lifestyle, and cardiovascular health.

Given:

Sunil drives 5 km from point A towards the west.

He then takes a left turn and drives 6 km.

He again takes a left turn and drives 11 km.

He then takes a left turn and drives 6 km.

He finally takes a right turn and drives 6 km to arrive at point B.

From the given information possible Venn diagram will be.

11 - 5 = 6 km

6 + 6 = 12 km

12km and in West direction does he have to drive to return to point A.

Thus, correct option is (a).

Correct Answer is: Only conclusion I follows.

Statements:

1. Some flowers are leaves.

2. Some flowers are stems.

3. Some fruits are flowers.

From the given statements possible Venn diagram will be.

Conclusions:

I. Some steams are flowers (True, there is direct relation of steam and flowers).

II. Some fruits are leaves. (False, there is not direct relation between fruits and leaves).

Only conclusion I follows.

Thus, correct option is (c).

Given: C @ B N M K J % F K L I & S E W * P O $ E A

Logic: Vowel | Symbol | Vowel

There is only one such symbols in the above series which is immediately preceded and followed by a vowel.

Thus, the correct option is (b) One

The correct answer is (a) 343 m/sec

Explanation:

The speed of sound in air at 20°C (68°F) is approximately 343 meters per second (m/s). This speed can vary depending on factors such as temperature, humidity, and air pressure. For example, the speed of sound increases with an increase in temperature.

Information Booster:

The speed of sound in air is calculated using the formula:

v = 331 m/s + (0.6×T)

where v is the speed of sound and T is the temperature in Celsius.

• At 0°C, the speed of sound is about 331 m/s, and it increases by 0.6 m/s for every 1°C rise in temperature.
• Sound travels faster in denser mediums like water (approximately 1481 m/s) and even faster in solids like steel (approximately 5960 m/s).

Correct Answer is: Neither assumption I nor II is implicit.

Statement:

"To expand their business, a budding company now requires more staff."

This statement simply indicates that to grow or expand their business, the companyneedsto hire additional staff.

Assumptions:

I: The current staff is incompetent.

The statement doesn’t say anything about the competence or incompetence of the current staff. It only mentions that more staff is needed to expand the business.

There's no direct or implied suggestion that the current staff cannot handle the business expansion.

So, assumption I is not implicit.

II: Business can only be expanded by always hiring new staff.

The statement focuses onthe need for more stafffor expansion, but it doesn’t necessarily imply that this is theonly wayto expand the business.

While the company may need more staff to expand at this particular moment, it doesn't rule out other methods for business growth, such as investing in infrastructure, improving processes, etc.

So, assumption II is also not implicit.

Conclusion:

Neither of the assumptions (I and II) is required or implied by the statement.

Neither assumption I nor II is implicit.

​The correct answer is (b) Both (i) and (ii)

Explanation:

The kinetic energy (KE) of a moving object is given by the formula:

where:

• m = Mass of the object
• v = Velocity of the object

From this formula, we observe that:

• Kinetic energy is directly proportional to the mass of the object (I)
• Kinetic energy is directly proportional to the square of the velocity (ii)
• Pressure does not affect kinetic energy, so (iii) is incorrect

Information Booster:

Key Insights on Kinetic Energy:

• If mass doubles, KE also doubles.
• If velocity doubles, KE becomes four times larger (since KE ∝ v²).
• KE is always positive since mass and squared velocity are always positive.

Real-Life Applications of Kinetic Energy:

• Moving vehicles → Faster speed means greater kinetic energy, leading to higher impact during collisions.
• Sports (cricket, football, etc.) → Heavier and faster-moving balls have more kinetic energy.
• Hydroelectric power generation → Flowing water has kinetic energy that turns turbines to produce electricity.

The Correct Answer Is: (c) Croton

Explanation:

Variegated leaves are those that show multiple colors (usually green with patches of white, yellow, or red) due to the uneven distribution of chlorophyll in leaf tissues.

Croton (Codiaeum variegatum) is a well-known plant with variegated leaves, displaying a mix of green, yellow, red, orange, and purple shades.

This variegation occurs due to genetic factors, mutation, or the presence of air spaces in leaf cells, which affect light reflection.

Information Booster:

Variegation is caused by chlorophyll deficiency in certain areas of the leaf, leading to different colors.

Croton is a tropical ornamental plant often grown for its vibrant foliage.

Variegation can be genetic or environmental, influenced by temperature and light exposure.

Variegated plants may require more sunlight since the non-green parts lack chlorophyll for photosynthesis.

Other variegated plants include Money Plant, Coleus, and Caladium.

Tissue culture is often used to propagate variegated plants as they may not reproduce true to type from seeds.

Some variegation is temporary, changing with plant age or environmental conditions.

Additional Knowledge:

Banana : Has uniformly green leaves; some ornamental varieties may show slight variegation.

Neem : Typically has deep green leaves without variegation.

Rose : Leaves are mostly green; variegation is rare and usually observed in hybrid varieties.

Given:

​3.5 × 2.4 × ? = 42

Concept Used: