All India SSC JE Group

Violence Movementc)Civil Disobedienced)Khilafat Movement

Active Element in a Circuit:

An active element in a circuit is a component or device that is capable of supplying energy or power to the circuit. It can generate, amplify, or control electrical signals. Active elements are usually electronic components such as transistors, operational amplifiers, and integrated circuits.

Explanation:

Option A: Diss... moreipates Energy
- This option is incorrect. An active element in a circuit does not dissipate energy; instead, it supplies energy to the circuit.

Option B: Receives Energy
- This option is incorrect. While an active element can receive energy from an external source, its primary function is to supply energy to the circuit.

Option C: Both Receives and Supplies Energy
- This option is incorrect. Although an active element can receive energy, it is mainly responsible for supplying energy to the circuit.

Option D: Supplies Energy
- This option is correct. An active element in a circuit supplies energy to the circuit. It can generate and amplify signals, providing power to other components or devices connected in the circuit.

Examples of Active Elements:
- Transistors: Transistors are widely used active elements in electronic circuits. They can amplify signals, switch currents, and perform various functions based on their configuration.
- Operational Amplifiers (Op-Amps): Op-Amps are versatile active elements that can perform amplification, filtering, and signal conditioning tasks in electronic circuits.
- Integrated Circuits (ICs): ICs are complex active elements that integrate multiple components into a single chip. They can perform various functions such as logic operations, analog signal processing, and memory storage.

Conclusion:
An active element in a circuit is responsible for supplying energy or power to the circuit. It can generate, amplify, or control electrical signals. Examples include transistors, operational amplifiers, and integrated circuits.

Question Analysis:
We are given that a 100W bulb is connected in series with a room heater. Our task is to determine what happens to the heater output when the 100W bulb is replaced by a 40W bulb.

Answer Explanation:
To understand the effect of replacing the bulb on the heater output, we need to consider the concept of series circuits and power.

S... moreeries Circuits:
In a series circuit, the current flowing through each component is the same. This means that the current passing through the bulb is equal to the current passing through the heater.

Power:
The power consumed by a device can be calculated using the formula:
Power = Voltage x Current

Effect of Replacing the Bulb:
1. When the 100W bulb is connected in series with the heater, the total power consumed by the circuit is the sum of the power consumed by the bulb and the power consumed by the heater. Let's denote the power consumed by the heater as P1.
Total Power = Power consumed by bulb (100W) + Power consumed by heater (P1)

2. Now, when the 100W bulb is replaced by a 40W bulb, the total power consumed by the circuit changes. Let's denote the power consumed by the heater with the 40W bulb as P2.
Total Power = Power consumed by 40W bulb + Power consumed by heater (P2)

3. Since the current passing through the circuit remains the same in a series circuit, the power consumed by the heater must be the same in both cases. This means that P1 = P2.

Conclusion:
When the 100W bulb is replaced by a 40W bulb, the power consumed by the heater remains the same. Therefore, the heater output will decrease because the total power consumed by the circuit decreases. This decrease in power consumption is due to the lower power rating of the 40W bulb.

Key Points:
- In a series circuit, the current passing through each component is the same.
- Power consumed by a device can be calculated using the formula: Power = Voltage x Current.
- When the 100W bulb is replaced by a 40W bulb, the power consumed by the heater remains the same.
- The heater output will decrease when the 100W bulb is replaced by a 40W bulb.

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Automobile Steering gear is an example of a Lower pair

Explanation:

Introduction:
In mechanical engineering, a pair is a connection between two elements that allows relative motion between them. There are different types of pairs based on the nature of the relative motion between the connected elements. One such type is the lower pair.

... moreLower Pair:
A lower pair is a type of kinematic pair where the two elements have surface or area contact with each other. The relative motion between the elements is a combination of both sliding and turning motions. The turning motion occurs around a fixed axis, while the sliding motion is perpendicular to the turning motion.

Automobile Steering Gear:
The automobile steering gear is responsible for transmitting the driver's input to the wheels, allowing the vehicle to change direction. It is a mechanism that connects the steering wheel to the front wheels.

Explanation of the Answer:
The automobile steering gear is an example of a lower pair because it exhibits the characteristics of a lower pair. Let's understand why:

1. Surface Contact: The steering gear consists of various components such as gears, shafts, and bearings. These components have surface contact with each other, allowing the transfer of motion.

2. Combination of Sliding and Turning Motion: The steering gear allows both sliding and turning motion. The turning motion occurs when the driver turns the steering wheel, which is transmitted to the wheels through the gear mechanism. The sliding motion is present in the gear teeth engagement, where the teeth slide past each other to transfer the motion.

3. Fixed Axis: The turning motion in the steering gear occurs around a fixed axis, which is the axis of rotation of the steering shaft.

Therefore, based on the characteristics of a lower pair, the automobile steering gear is an example of a lower pair.

Conclusion:
The automobile steering gear is an example of a lower pair as it exhibits the characteristics of surface contact, a combination of sliding and turning motion, and a fixed axis of rotation. Understanding the different types of pairs and their applications in mechanical systems is crucial for designing and analyzing various mechanisms.

Introduction:
The Indus Valley civilization was one of the earliest urban civilizations in the world, flourishing around 2500 BCE in what is now Pakistan and northwest India. It is known for its well-planned cities, advanced architecture, and sophisticated drainage systems. The civilization extended from modern-day northeast Afghanistan to Pakistan and northwest India.

Id... moreentification of the site:
The site of the Indus Valley civilization that is situated on the bank of the Luni River is Dholavira. Dholavira is one of the five largest Harappan sites and is located in the Kutch district of Gujarat, India. It is an archaeological site that has been excavated and studied extensively.

Significance of Dholavira:
Dholavira is considered one of the most important archaeological sites related to the Indus Valley civilization. It is known for its well-preserved urban planning and advanced water management systems. The site provides valuable insights into the political, social, economic, and cultural aspects of the Indus Valley civilization.

Features of Dholavira:
1. Harappan Town Planning: Dholavira is divided into three parts: the Citadel, the Middle Town, and the Lower Town. The Citadel is fortified and contains important structures like the ruler's palace and the ceremonial ground.
2. Water Management: Dholavira has an elaborate water management system, including channels, reservoirs, and step wells. The water management system indicates the importance of agriculture and the efficient use of water resources in the civilization.
3. Significant Structures: The site has several impressive structures, including the Great Bath, which resembles the Great Bath at Mohenjo-daro. It also has large open spaces, buildings with multiple rooms, and an underground structure believed to be a granary.
4. Artifacts and Inscriptions: Excavations at Dholavira have uncovered a variety of artifacts, including pottery, seals, beads, jewelry, and terracotta figurines. The site is also known for its unique signboard-like inscriptions, which are yet to be fully deciphered.

Conclusion:
Dholavira, situated on the bank of the Luni River, is an important site of the Indus Valley civilization. Its well-preserved urban planning, advanced water management systems, and significant structures provide valuable insights into the civilization's culture and way of life. The site's excavation and study contribute to our understanding of the ancient Indus Valley civilization.

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