Bissoy.com
Doctors Medicines MCQs Q&A

Choose the correct statement about the roller of a van-de-Graaff generator.

Choose the correct statement about the roller of a van-de-Graaff generator. Correct Answer Both are correct 

CONCEPT:

  • A Van De Graff generator is used to accelerate charged particles.

 

[ alt="F2 J.K Madhu 19.05.20 D4" src="//storage.googleapis.com/tb-img/production/20/05/F2_J.K_Madhu_19.05.20_D4.png" style="width: 385px; height: 357px;">
  • This is achieved by means of a moving belt and suitable brushes, through which charge is continuously transferred to the shell and this, in turn, produces a potential difference of the order of several million volts.
  • This large potential difference thus created, is used to accelerate charged particles to very high speeds.
  • The electrostatic generator that uses a moving belt to accumulate electric charge on a hollow metal surface on the top of an insulated column which creates a very high electric potential/Voltage is called as Van de Graff generator. 
  • This Van de Graff can produce a very high voltage at low current levels and can easily accelerate charge particles as per requirement of our experiment.
  • Here there are two pulleys which are also known as roller.

EXPLANATION:

[ alt="F2 J.K Madhu 19.05.20 D5" src="//storage.googleapis.com/tb-img/production/20/05/F2_J.K_Madhu_19.05.20_D5.png" style="width: 229px; height: 293px;">

  • The roller in the Van de Graff generator is used to rotate the belt. So statement 2 is correct.
  • It is also used to attract the opposite charge. So statement 1 is correct. Hence option 3 is correct.

Related Questions

An attempt is made to pull a roller of weight W over a curb (step) by applying a horizontal force F as shown in the figure. The coefficient of static friction between the roller and the ground (including the edge of the step) is μ. Identify the correct free body diagram (FBD) of the roller when the roller is just about to climb over the step.
If a mother is a non tongue roller and Father is a tongue roller, whose father was a non- roller, what is the probability of having a roller daughter?
Transient stability of the generator is dependent on (a) generator reactance; lower reactance decreases peak power and increases initial rotor angle. (b) how heavily the generator is loaded. (c) generator inertia; higher the inertia, slower the rate of the change of angle. (d) generator output during fault Which of the above is incorrect?
A roller is 70 cm long and has a diameter of 2 cm. It takes exactly 100 rotations of the roller to level a road. If the cost of using the roller is 0.5 rupees per square cm, then what is the cost of levelling the road?
A cylindrical roller made or iron is 1.2 m long. Its internal radius is 24 cm and thickness of the iron sheet used in making the roller is 15 cm. What is the mass (in kg) of the roller, if 1 cm3 of iron has 8 g mass?
A road roller has a total mass of 12 tonnes. The front roller has a mass of 2 tonnes, a radius of gyration of 0.4 m and a diameter of 1.2 m. The rear axle, together with its wheels, has a mass of 2.5 tonnes, a radius of gyration of 0.6 m and a diameter of 1.5 m. Calculate total kinetic energy of road roller.
A road roller has a total mass of 12 tonnes. The front roller has a mass of 2 tonnes, a radius of gyration of 0.4 m and a diameter of 1.2 m. The rear axle, together with its wheels, has a mass of 2.5 tonnes, a radius of gyration of 0.6 m and a diameter of 1.5 m. Calculate braking force required to bring the roller to rest from 9 km/h in 6 m on the level.
In a turbopump system using a gas generator cycle, the flame temperature in the separate gas generator where a small portion of overall propellant is burned is _________ compared to the main gas generator and its mixture ratio is _________ compared to that of the main gas generator.
The question given below consists of a statement, followed by three arguments numbered I, II and III. You have to decide which of the arguments is/are ‘strong’ arguments and which is/are ‘weak’ arguments and accordingly choose your answer from the alternatives given below each question. Statement: In the wake of globalization and digitization of the manner in which the business are conducted, the IT/ITES industry holds a significant place in the future business scenario. The Economic Survey 2017-18 mentioned that the IT/ITES services industry in India has scaled to around $140 billion during 2016-17. India today is globally the top outsourcing destination accounting for more than half of the market share. The IT/ITES industry has contributed around 7.7% of the country's GDP and according to IBEF is a key employment generator with a projection of creating 1.3-1.5 lakh new jobs annually. Which among the following arguments support the above statement in the best possible manner? Arguments: I. The Government has also provided considerable inputs to the industry with its various flagship programmes such as Digital India, Smart Cities, e-Governance coupled with a drive towards a cashless economy. II. The Government has been pro-active in considering demands of the industry and providing timely respite from the teething troubles under GST as well.  III. The IT/ITES industry is a labour intensive industry and a large scale employment generator. It is a common practice across the industry to provide various privileges and facilities to their staff in order to boost employee retention rates in their organisation.
Taking the following statements to be true even if they seem to be at variance from commonly known facts, decide which of the conclusion(s) logically follows from the given statements. Statement: All pigeons are doves. All doves are oriental roller. Conclusion: 1. All oriental roller are doves. 2. All pigeons are oriental rollers.