Q671. In a Class 2 lever, such as a wheelbarrow or a nutcracker, the positions are arranged as:
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Q672. Consider the following statements about simple machines:
I. They can multiply force.
II. They can multiply speed or distance.
III. They can change the direction of an applied force.
IV. They can multiply work, outputting more energy than is put in.
V. An inclined plane is a type of simple machine.
Which of the above statement(s) is/are incorrect?
I. They can multiply force.
II. They can multiply speed or distance.
III. They can change the direction of an applied force.
IV. They can multiply work, outputting more energy than is put in.
V. An inclined plane is a type of simple machine.
Which of the above statement(s) is/are incorrect?
Explanation
Simple machines are designed to make work easier by multiplying force, increasing speed, or changing the direction of an applied force. However, they cannot multiply work or energy. According to the law of conservation of energy, the output work can never exceed the input work. In fact, due to friction, the useful work output is always slightly less than total energy.
Q673. In a Class 3 lever, the mechanical advantage is always:
Explanation
In a Class 3 lever, the effort is applied between the fulcrum and the load. Because the effort arm is always shorter than the load arm, the mechanical advantage is consistently less than one. While these machines require more force than the load itself, they are useful because they multiply the distance or speed at which the load moves, as seen in tweezers.
Q674. A single fixed pulley offers a mechanical advantage of approximately 1. What is its primary practical purpose?
Explanation
A single fixed pulley has a mechanical advantage of approximately one, meaning the effort required is equal to the load. While it doesn’t multiply force, its primary practical advantage is changing the direction of the applied effort. This allows a person to pull downward using their body weight to lift a load upward, which is often much easier than lifting directly.
Q675. Match the simple machines in List I with their corresponding everyday examples in List II.
| Simple Machine | Everyday Example |
|---|---|
| A. Inclined plane | i. Axe blade |
| B. Wedge | ii. Doorknob |
| C. Screw | iii. Wheelchair ramp |
| D. Wheel and axle | iv. Spiral staircase |
Explanation
Simple machines are found in many common objects. A wheelchair ramp is a practical application of an inclined plane. An axe blade functions as a wedge to split wood. A spiral staircase acts as a screw wrapped around a central pillar. A doorknob is a classic example of a wheel and axle system. These devices all serve to manipulate applied force.
Q676. A screw can be fundamentally described as which type of simple machine wrapped around a central cylinder?
Explanation
A screw is fundamentally an inclined plane that has been wrapped around a central cylinder or shaft in a spiral pattern. The threads of the screw act as the sloping surface. This design converts rotational motion and torque into linear force and displacement. By spreading the effort over a longer distance along the threads, a screw provides a high mechanical advantage.
Q677. The efficiency of a practical simple machine is always less than 100% primarily due to:
Explanation
The efficiency of any real-world simple machine is always less than one hundred percent. This is primarily because some of the input energy is always converted into non-useful forms, such as heat and sound, due to friction between moving parts. While lubrication can reduce these losses, friction can never be entirely eliminated, ensuring that output work is always less than input work.
Q678. Match the machine terms in List I with their corresponding definitions in List II.
| Machine Term | Definition |
|---|---|
| A. Fulcrum | i. The fixed point around which a lever pivots |
| B. Load | ii. The resistance force to be overcome |
| C. Effort | iii. The force applied to the machine |
| D. Velocity Ratio | iv. Ratio of distance moved by effort to distance moved by load |
Explanation
Understanding simple machines requires defining key terms. The fulcrum is the fixed pivot point of a lever. The load represents the weight or resistance to be moved, while the effort is the force applied by the user. The velocity ratio is the distance moved by the effort divided by the distance moved by the load. Together, these terms describe mechanical performance.
Q679. Which of the following statements best describes the primary significance of regional chronicles (Khyats) in understanding the history of Rajasthan?
Explanation
Regional chronicles known as Khyats are essential historical documents that provide localized insights into the administrative structures and socio-political climates of various Rajput states. Unlike general histories, these chronicles focus on the specific lineages of ruling clans, detailing their genealogical records, territorial expansions, and internal governance mechanisms across several generations of influential Rajput leadership.
Q680. Who among the following scholars proposed the Central Asian homeland theory for the origin of the Indo-Aryans based on philological evidence?
Explanation
Philological evidence links Sanskrit with European languages, suggesting a common origin. Max Muller proposed that the Indo-Aryans migrated from Central Asia toward India. His theory emphasizes linguistic similarities in the Indo-European family, identifying Central Asia as the likely homeland. This perspective remains a significant contribution to understanding the early migrations and roots of Vedic culture.Answer key for these questions
| Q | Correct answer |
|---|---|
| 671 | (b) Load is between the Fulcrum and the Effort |
| 672 | (c) IV only |
| 673 | (b) Less than 1 |
| 674 | (d) To change the direction of the applied effort |
| 675 | (a) A-iii, B-i, C-iv, D-ii |
| 676 | (b) An inclined plane |
| 677 | (d) Friction between moving parts |
| 678 | (a) A-i, B-ii, C-iii, D-iv |
| 679 | (b) They record the lineage, administrative setup, and socio-political conditions of Rajput states locally. |
| 680 | (b) Max Muller |
Frequently asked questions
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This page has 9654 practice MCQs on the RAS Prelims syllabus. Each has the correct answer, and most have an explanation.
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Attempt each question first, then open the answer and read the explanation. Practise one chapter at a time, note the facts you got wrong and revise them. Repeat the chapter after a few days.
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No. These are practice questions written for the RAS Prelims syllabus. They follow the pattern the exam uses: factual questions, statement-based questions, match-the-list and assertion-reason.