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All questions of January Week 2 for Class 10 Exam

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The resistance of a conductor increases with-
I: Increase in length
II: Increase in volume
III: Decrease in area
  • a)
    I or III
  • b)
    II only
  • c)
    I or II
  • d)
    III only
Correct answer is option 'A'. Can you explain this answer?

💐 answered
Resistance is directly proportional to Length nd inversely proportional to Area


Hence , resistance increase with increase in area nd increases with decrease in area !!!

A certain wire has a resistance R. The resistance of another wire identical with the first and having twice its diameter is;
  • a)
    0.5 R
  • b)
    0.25 R
  • c)
    4 R
  • d)
    2 R
Correct answer is option 'B'. Can you explain this answer?

Rahul Kapoor answered
Resistance of a wire is inversely proportional to the cross−sectional area:
R α 1/A   
  α 1/πd^2/4  
  α 1/d^2

R'/R = (d/d')^2
R'= R(d/2d)^2    
  = R/4    
  = 0.25 R

Two light bulbs P and Q are identical in all respects, except that P’s filament is thicker than Q’s. If the same potential difference is applied to each, then
  • a)
    P will burn brighter because it has the lower resistance
  • b)
    Q will burn brighter because it has the lower resistance.
  • c)
    Q will burn brighter because it has the greater resistance.
  • d)
    P will burn brighter because it has the greater resistance.
Correct answer is 'A'. Can you explain this answer?

Divyansh Mehta answered
Explanation:

When the same potential difference is applied to two light bulbs, the bulb with lower resistance will draw more current and dissipate more power, causing it to shine brighter.

The resistance of a conductor is directly proportional to its length and inversely proportional to its cross-sectional area. Therefore, thicker filaments have lower resistance than thinner filaments.

Reasoning:

P has a thicker filament than Q, which means it has a lower resistance. Therefore, P will draw more current and dissipate more power than Q, causing it to shine brighter.

Q has a thinner filament than P, which means it has a higher resistance. Therefore, Q will draw less current and dissipate less power than P, causing it to shine dimmer.

Answer:

Hence, the correct answer is option A, which states that P will burn brighter because it has the lower resistance.

 Which of the following terms does not represent electrical power in a circuit?
  • a)
    V2/R
  • b)
    I2R
  • c)
    IR2
  • d)
    VI
Correct answer is option 'C'. Can you explain this answer?

Nisha Choudhury answered
Electric power in terms of current = IR2 and in terms of voltage = V2/R and in terms of voltage and current both = VI

Two light bulbs are marked 230 V; 75 W and 230 V; 150 W. If the first bulb has a resistance R, then the resistance of the second is;
  • a)
    2R
  • b)
    (1/2)R
  • c)
    4R
  • d)
    (1/4) R
Correct answer is option 'B'. Can you explain this answer?

Pooja Shah answered
Power = voltage * current 
=  Voltage * ( voltage / resistance) 
Hence, if P is power, V is Voltage and R is resistance, then R = V ^2/ R 
Hence for first bulb, R1 = V^2/75 = R
For second bulb, R2 = V^2 / 150
 = > ½ (V^2/75) = R/2 
=> R/2

Can you explain the answer of this question below:
Two bulbs marked 200 watt-250 volts and 100 watt-250 volts are joined in series to 250 volts supply. Power consumed in circuit is
  • A:
    67 watt
  • B:
    100 watt
  • C:
    300 watt
  • D:
    33 watt
The answer is a.

Rajiv Gupta answered
We know that, R = V^2 /P
Hence resistance of 1st bulb = (250)^2 / 200 = 625/2
resistance of 2nd bulb = (250)^2 / 100 = 625
Total resistance of the circuit when the bulbs are connceted in series = 625/2 + 625 = 1875/2 ohm
Therefore, total power consumed in the circuit , P = (250)^2 / (1875/2) = 67 watt

An electric refrigerator rated 500 W operates 10 hr per day. What is the cost of the energy to operate it for 30 days at Rs. 4.00 per kWh?​
  • a)
    Rs. 600
  • b)
    Rs. 400
  • c)
    Rs. 500
  • d)
    Rs. 800
Correct answer is option 'A'. Can you explain this answer?

Gaurav Kumar answered
The Fuse wire connection are in between the appliance and main line. It is are very thin wire and when very high current passes through it suddenly, the fuse wire gets heated and melts due to the produced heat. This saves the household appliances

With so many thousands of goods and services produced, economists suggest that the values of goods and services should be used rather than adding up the actual numbers. For example, if 10,000 kgs of wheat is sold at Rs 20 per kg, the value of wheat will be Rs ____.
  • a)
    100,000
  • b)
    200,000
  • c)
    20,000
  • d)
    10,000
Correct answer is option 'B'. Can you explain this answer?

Tanvi verma answered
Calculation of the value of wheat

Given:
- Quantity of wheat = 10,000 kgs
- Price per kg = Rs 20

Formula:
Value = Quantity x Price
Calculation:
Given Quantity = 10,000 kgs
Price per kg = Rs 20
Value of wheat = 10,000 kgs x Rs 20/kg
Value of wheat = Rs 200,000
Therefore, the value of 10,000 kgs of wheat at Rs 20 per kg is Rs 200,000. So, the correct answer is option B) 200,000.

Choose the correctly matched pair:
  • a)
    Primary Sector - Construction
  • b)
    Secondary Sector - Manufacturing
  • c)
    Tertiary Sector - Farming
  • d)
    Organised Sector - Street Vendors
Correct answer is option 'B'. Can you explain this answer?

EduRev Class 10 answered
  • Option A: (a) Primary Sector - Construction
    This is incorrect. The primary sector includes activities related to natural resources, such as agriculture, fishing, and mining. Construction falls under the secondary sector, which involves manufacturing and building activities.
  • Option B: (b) Secondary Sector - Manufacturing
    This is correct. The secondary sector encompasses all activities related to manufacturing and industry, including the production of goods in factories. Manufacturing is a key component of the secondary sector.
  • Option C: (c) Tertiary Sector - Farming
    This is incorrect. The tertiary sector involves services such as retail, entertainment, financial services, and others. Farming is part of the primary sector since it involves the direct extraction of resources from nature.
  • Option D: (d) Organised Sector - Street Vendors
    This is incorrect. The organised sector consists of established businesses and industries that are registered with the government and follow regulations regarding wages, work hours, and conditions. Street vendors typically belong to the unorganised sector, which lacks formal registration and regulation.
  • Thus, the correctly matched pair is Option B: (b) Secondary Sector - Manufacturing.

Assertion (A): Setting up industries in semi-rural areas can help create employment opportunities for a large number of people.
Reason (R): Industries located in semi-rural areas tend to utilize local resources and provide job opportunities closer to rural populations.
  • a)
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • b)
    If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • c)
    If Assertion is true but Reason is false
  • d)
    If both Assertion and Reason are false
Correct answer is option 'A'. Can you explain this answer?

Gowri Mehta answered
Understanding the Assertion and Reason
The assertion (A) states that setting up industries in semi-rural areas can create employment opportunities for a large number of people. The reason (R) provided explains that industries in these areas utilize local resources, making job opportunities accessible to rural populations.
Evaluation of Assertion (A)
- True Statement: The assertion is true because establishing industries in semi-rural regions can significantly boost local economies.
- Job Creation: It leads to employment opportunities in various sectors, including manufacturing, services, and agriculture-related industries.
Evaluation of Reason (R)
- True Statement: The reason is also true as industries located in semi-rural areas often rely on local resources such as raw materials, labor, and infrastructure.
- Accessibility: This proximity enables easier access to jobs for the local population, reducing the need for migration to urban centers.
Correct Explanation Relationship
- Link Between A and R: The reason (R) effectively explains why the assertion (A) holds true. By utilizing local resources, industries not only foster development but also create a sustainable environment for job growth.
- Causative Effect: The establishment of industries leads to job creation, which is directly supported by the utilization of local resources.
Conclusion
Given that both the assertion and reason are true, and the reason correctly explains the assertion, the answer is option 'A'. This highlights the importance of strategic industrial placement in fostering economic growth and enhancing employment opportunities in semi-rural areas.

Choose the correctly matched pair:
  • a)
    MGNREGA 2005 - Right to Work
  • b)
    Organised Sector - Daily wage labourer
  • c)
    Unorganised Sector - Doctor in a hospital
  • d)
    Tertiary Sector - Farmer irrigating her field
Correct answer is option 'A'. Can you explain this answer?

Seema gupta answered
Correct Answer: MGNREGA 2005 - Right to Work
The Mahatma Gandhi National Rural Employment Guarantee Act (MGNREGA) was enacted in 2005 to enhance livelihood security in rural areas.
Key Features of MGNREGA:
  • Right to Work: MGNREGA guarantees at least 100 days of unskilled wage employment in a financial year to every rural household whose adult members volunteer to do unskilled manual work.
  • Legal Guarantee: It provides a legal guarantee for at least 100 days of wage employment, ensuring that work is available to those who seek it.
  • Empowerment: The act empowers rural households and promotes social inclusion by providing work opportunities.

Why Other Options Are Incorrect:
  • Organised Sector - Daily wage labourer: The organised sector typically includes formal employment with benefits, while daily wage labourers often belong to the unorganised sector.
  • Unorganised Sector - Doctor in a hospital: Doctors in hospitals are usually part of the organised sector, often having formal contracts and benefits.
  • Tertiary Sector - Farmer irrigating her field: Farmers are primarily part of the primary sector, which involves agriculture and raw material production.

Conclusion:
MGNREGA exemplifies the "Right to Work" by ensuring employment for rural households, distinguishing it as a significant step towards economic security and social welfare in India.

Choose the correctly matched pair.
  • a)
    Disguised Unemployment - Overemployment in the service sector
  • b)
    Primary Sector - Largest employer producing one-sixth of GDP
  • c)
    Tertiary Sector - Largest employer producing one-sixth of GDP
  • d)
    Secondary Sector - Producing the least GDP
Correct answer is option 'B'. Can you explain this answer?

EduRev Class 10 answered
  • Option A: Incorrect. Disguised unemployment refers to a situation where more people are employed than necessary, often in the agricultural sector, not specifically overemployment in the service sector.
  • Option B: Correct. The primary sector continues to be the largest employer in India, employing more than half of the workers, but it produces only about one-sixth of the GDP.
  • Option C: Incorrect. The tertiary sector is not the largest employer; it is the primary sector. The tertiary sector has seen significant growth in production but not as much in employment.
  • Option D: Incorrect. The secondary sector is not producing the least GDP. It has seen growth in industrial output, but its employment growth has not matched the production increase.

What is the main purpose of classifying economic activities into different sectors?
  • a)
    To confuse students
  • b)
    To analyze production and employment patterns
  • c)
    To limit job opportunities
  • d)
    To increase government control
Correct answer is option 'B'. Can you explain this answer?

Kamna Science Academy answered
The primary aim of classifying economic activities into different sectors is to analyze the patterns of total production and employment, enabling a better understanding of the economy's functioning and needs.

Choose the correctly matched pair.
  • a)
    Tailor - Tertiary sector
  • b)
    Courier - Primary sector 
  • c)
    Both A and B
  • d)
    Bee-keeper - Primary sector
Correct answer is option 'D'. Can you explain this answer?

Nk Classes answered
d) Bee-keeper - Primary sector
Bee-keeper is engaged in the collection of natural resources like honey and beeswax, which places it in the Primary sector, as it involves activities related to natural resource extraction.
The other pairs are incorrect because:
a) Tailor - Tertiary sector: A tailor belongs to the Secondary sector as they are involved in manufacturing goods (clothing).
b) Courier - Primary sector: A courier is part of the Tertiary sector since they provide a service (delivery and transportation).
Therefore, Correct Answer - Option D

Small-scale industry workers often face ____ and low-paid work.
  • a)
    irregular
  • b)
    regular
  • c)
    stable
  • d)
    unpredictable
Correct answer is option 'A'. Can you explain this answer?

EduRev Class 10 answered
Small-scale industry workers often face irregular and low-paid work, highlighting the challenging and inconsistent nature of their employment within this sector.

What does the Mahatma Gandhi National Rural Employment Guarantee Act 2005 (MGNREGA 2005) guarantee?
  • a)
    50 days of employment annually
  • b)
    100 days of employment annually
  • c)
    200 days of employment annually
  • d)
    365 days of employment annually
Correct answer is option 'B'. Can you explain this answer?

EduRev Class 10 answered
The Mahatma Gandhi National Rural Employment Guarantee Act 2005 guarantees 100 days of employment annually to those who are able and in need of work in rural areas, aiming to provide job security and income support to the rural population.

What sector in India has emerged as the largest producing sector in 2013-14?
  • a)
    Primary sector
  • b)
    Secondary sector
  • c)
    Tertiary sector
  • d)
    Quaternary sector
Correct answer is option 'C'. Can you explain this answer?

Nk Classes answered
The tertiary sector in India emerged as the largest producing sector in 2013-14, signifying a significant shift in the economy towards service-based activities over the years.

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