Question Discussion & Solution

Void pointer: It is a specific pointer type – void * – a pointer that points to some data location in storage, which doesn’t have any specific type. Void refers to the type.

• void pointers cannot be dereferenced. It can however be done using typecasting the void pointer
• Pointer arithmetic is not possible on pointers of void due to lack of concrete value and thus size

Other Important Points

Dangling pointer: A pointer pointing to a memory location that has been deleted (or freed) is called dangling pointer.   

Uninitialized pointer : An uninitialized pointer stores an undefined value. A null pointer stores a defined value, but one that is defined by the environment to not be a valid address for any member or object.

NULL Pointer : NULL Pointer is a pointer which is pointing to nothing. In case, if we don’t have address to be assigned to a pointer  

The correct answer is Projector.

Important Points

•  Projector
  • ​A projector is an optical device that projects an image (or moving images) onto a projection screen.
  • There are four main types including;
    • ​DLP: Digital Light Processing, 
    • LCD: Liquid Crystal Display
    • LCOS: Liquid Crystal on Silicon. 
    • Laser projectors 

​Key Points

• Output device
  • An output device is any hardware device used to send data from a computer to another device or user.
  • Some of the output devices are:
    • Visual Display Units (VDU)
    • Monitor, Printer,
    • Graphic Output devices,
    • Plotters, Speakers.

Additional Information

• Mouse
  • A computer mouse is a hand-held pointing device that detects two-dimensional motion relative to a surface. 
• Optical Character Recognition, or OCR
  • ​It is a technology that enables to convert different types of documents, such as scanned paper documents, PDF files or images captured by a digital camera into editable and searchable data.
• Webcam
  • A webcam is a camera that connects to a computer.
  • It captures still pictures or motion video.
  • with the aid of software, can transmit its video on the Internet in real-time. 

The correct asnwer is Bikaner.

• The annual fair of Kolayat is organized in Bikaner, Rajasthan.
  • It is also called the Kapil Muni Mela.
  • It is organized in the Bikaner district of Rajasthan.
  • The fair is organized at the bank of the Kolayat river.
  • The fair is organized in the month of Karthik of the Hindu Calendar.

Additional Information

Fairs of Rajasthan

The correct answer is Indicator.

Key Points

• Indicators are substances that show a change in colour when brought in contact with acids and bases.
• The most common indicator used in the laboratory is Litmus.
• Litmus is extracted from lichens.

Additional Information

• A promoter is a sequence of DNA needed to turn a gene on or off.
• A neutralizer is a substance used in the neutralization of acidic water.
• Neutralization is a chemical reaction in which acid and a base react quantitatively with each other to form water and salt.
• A catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the reaction.

Concept:

Indian Space Research Organisation (ISRO):

• It is the premier space agency of the government of India.
• Its vision is to harness space technology for national development while pursuing space science research and planetary exploration.
• The space research activities were initiated in India under Dr. Vikram Sarabhai, the founding father of the Indian space program, during the 1960s.
• ISRO established: 15 August 1969
• Headquarters: Bengaluru

​Explanation:

Vikram Sarabhai:

• Vikram Sarabhai was an Indian Physicist.
• He Initiated Space Research.
• He is also known as the 'Father of the Indian space program'.
• Vikram Sarabhai also researched cosmic Rays under Dr. C.V. Raman, a noble prize winner.

Thus, the Indian Space Research Center was formed by Vikram Sarabhai.

Additional Information 

Homi Baba:

• Homi Baba worked towards the development of nuclear power.
• Known as the 'Father of the Indian nuclear program'
• He founded the Tata Institute Of Fundamental Research. 

Rakesh Sharma:

• Rakesh Sharma is the first Indian citizen to travel to space.
• Rakesh Sharma flew aboard Soyuz T - 11 along with Yury Malyshev and Flight Engineer Gennadi Strekalov.
• He became the first Indian to enter space in 1984.
• He was an officer in the Indian Air Force.
• He was awarded the honour of “the Hero of the Soviet Union”.
• He also received Ashok Chakra, India’s highest peacetime gallantry award.

K Sivan:

• Dr K Sivan was the Chairman of Indian Space Research Organisation uptill 2021.
• He was born in 1957 in Kanyakumari, Tamil Nadu.
• Dr Sivan was inducted into Polar Satellite Launch Vehicle Project of ISRO in 1982.
• He also served as Director at Liquid Propulsion Systems Centre at ISRO and Vikram Sarabhai Space Centre.
• He assumed the office as chief of ISRO in 2018.