All questions of September Week 4 for Class 10 Exam

Because road are in front of your door bro not
waterway railway or airport
imagine a your runway infront of your house door
the plane will land inside your house ..

Sorry!!! I can't

= h/30
b)sin 45 = h/30
c)tan 45 = h/30
d)sec 45 = h/30

Answer: b) sin 45 = h/30

Explanation:
The angle of elevation is the angle between the horizontal ground and the line of sight to the top of the pole. In this case, the angle of elevation is 45 degrees.

We can use the trigonometric ratio of sine to find the height of the pole. The sine of an angle is the ratio of the opposite side to the hypotenuse in a right triangle.

In this case, the opposite side is the height of the pole (h) and the hypotenuse is the distance from the point to the base of the pole (30 feet). Therefore, we have:

sin 45 = h/30

Solving for h, we get:

h = 30 sin 45

Using a calculator, we find that sin 45 is approximately 0.707. Therefore,

h = 30 x 0.707 = 21.21 feet

So the height of the pole is approximately 21.21 feet.

Given:
DC=40cm
CB=Xcm
AB=(40+X)cm

To find:
AB=h=?

Sol:
tan60= opp/adj = h/X=√3 => h=X√3 —>1
tan30= opp/adj = h/40+X=1/√3 => h=(40+X)/√3 —>2

from eq.1&2:
X√3 = (40+X)/√3
3X=40+X
2X=40
X=20

therefore, h=(40+20)/√3
h=20√3
hence the option is 'c'

Principal mode of transportation for freight and passengers in India are:
1. Railways: Railways are the most important mode of transportation in India, both for freight and passengers. It is the backbone of the country's transportation system and plays a vital role in connecting different regions and facilitating the movement of goods and people. Key points about railways in India include:
- Indian Railways is one of the largest railway networks in the world, covering a vast distance and connecting thousands of towns and cities.
- It provides various types of trains, including passenger trains, express trains, and freight trains, catering to the different needs of people and industries.
- Railways offer a cost-effective and efficient means of transportation for both goods and passengers, with well-established routes and schedules.
- Freight trains carry a wide range of commodities, including raw materials, agricultural products, industrial goods, and petroleum products, among others.
- Passenger trains provide affordable and convenient travel options for people across different income groups, with various classes and facilities available.
2. Roadways: While railways dominate long-distance transportation, roadways play a crucial role in last-mile connectivity and transportation within cities and towns. Key points about roadways in India include:
- India has an extensive road network, with national highways, state highways, and local roads connecting various parts of the country.
- Roadways are essential for transporting goods and passengers to remote areas where railways may not be accessible.
- Trucks, buses, and other vehicles are widely used to transport goods and people, offering flexibility and convenience.
- Road transport is essential for the distribution of goods from railway stations to final destinations and for door-to-door delivery services.
- However, road transport is often affected by traffic congestion, road conditions, and other challenges, impacting efficiency and travel time.
3. Waterways: India has a vast network of rivers, canals, and coastal areas, making waterways another significant mode of transportation. Key points about waterways in India include:
- Inland waterways, such as rivers and canals, are used for transporting goods and passengers, especially in regions with extensive water resources.
- Coastal shipping is an important mode for transporting goods along the country's coastline, connecting major ports and facilitating trade.
- Water transport is particularly suitable for carrying heavy and bulky goods, such as minerals, coal, and construction materials.
- The government has been working on developing and modernizing waterways to enhance connectivity and promote environmentally friendly transportation options.
4. Airways: While air transport is widely used for passenger travel, it plays a relatively smaller role in freight transportation in India. Key points about airways in India include:
- Air transport is the fastest mode of transportation, suitable for long-distance travel and urgent delivery of goods.
- It is primarily used for carrying high-value and time-sensitive goods, such as perishable goods, pharmaceuticals, and electronic equipment.
- Airports are strategically located across the country, connecting major cities and international destinations.
- However, air transport is relatively expensive compared to other modes, making it less accessible for bulk transportation of goods.
Overall, railways are the principal mode of transportation for both freight and passengers in India, followed by roadways, waterways, and airways. These modes work together to ensure efficient connectivity and movement of goods and people across the country.

Understanding Male Contraception
Contraceptive methods aim to prevent pregnancy, and in males, the most commonly discussed surgical method is a vasectomy.
What is a Vasectomy?
- A vasectomy is a surgical procedure that involves cutting and sealing the vas deferens, the tubes that carry sperm from the testicles to the urethra.
- This procedure effectively blocks sperm from mixing with semen, thus preventing sperm from being released during ejaculation.
Procedure Details
- The surgery is typically performed under local anesthesia.
- It can be done through small incisions or using a no-scalpel technique, which minimizes bleeding and recovery time.
- The procedure usually lasts about 15-30 minutes, and patients can often return home the same day.
Effectiveness of Vasectomy
- A vasectomy is one of the most effective forms of contraception, with a success rate exceeding 99%.
- It is considered a permanent method of contraception, although reversibility is possible in some cases.
Benefits of Vasectomy
- No impact on hormone levels or sexual function.
- It is a safer option compared to female sterilization.
- It eliminates the need for other contraceptive methods, providing long-term peace of mind.
Conclusion
In summary, the correct answer to the question regarding male surgical contraception is option 'B': blocking the vas deferens through a vasectomy. This method is a reliable and effective way for males to take control of their reproductive health.