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Q.1. Which one of the following types of laser is used in laser printers?
(a) Excimer laser
(b) Dye laser
(c) Semiconductor laser
(d) Gas laser
Correct Answer: C
Explanation- A semiconductor diode laser is currently used in laser printers as the light source. Hence Option C is correct.
Q.2. The first Indian satellite ‘Aryabhatta’ was launched in which year?
(a) 1970
(b) 1972
(c) 1975
(d) 1980
Correct Answer: C
Explanation- 19/04/1975
Within six years of formation, ISRO launches Aryabhata, the first Indian Satellite, on April 19, 1975. Hence Option C is correct.
Q.3. Identify the metal which is non-toxic in nature?
(a) Chromium
(b) Gold
(c) Cadmium
(d) Cobalt
Correct Answer: B
Explanation- Most often the definition includes at least cadmium, lead, mercury and radioactive metals. Hence Option B is correct.
Q.4. The first bead-making evidence is found from which of the following?
(a) Patne
(b) Bhimbetka
(c) Adamgarh
(d) Baghor
Correct Answer: A
Explanation- Evidence of beads occurs in India and in the world since the prehistoric period. In India, beads of ostrich eggshell were found at Patne from Upper Palaeolithic levels (Sali 1985). Since then, through the proto-historic period till today, continuous use of beads is seen. Hence Option A is correct.
Q.5. Diamond is hard because____________?
(a) It cannot be burnt.
(b) It is made up of carbon atoms.
(c) It is a giant molecule.
(d) All the four valence electrons are bonded to each carbon atom by covalent bonds.
Correct Answer: D
Explanation- It is made up of carbon atoms. It cannot be burnt. In diamond, each carbon atom is in sp3 hybridized state and linked to four other carbon atoms tetrahedrally by covalent bonds. Hence Option D is correct.
Q.6. Which one of the following has the highest melting point?
(a) Gold
(b) Silver
(c) Silicon
(d) Copper
Correct Answer: C
Explanation-
The melting point copper1,085 °C
The melting point gold1,064 °C
The melting point silver961.8 °C
The melting point of Silicon is 1414°C. Crystal structure. Silicon crystallises in a giant covalent structure at standard conditions, specifically in a diamond cubic lattice. It thus has a high melting point of 1414 °C, as a lot of energy is required to break the strong covalent bonds and melt the solid. Hence Option C is correct.
Q.7. Density of water is highest the temperature of_________?
(a) 0°C
(b) 4°C
(c) 50°C
(d) 100°C
Correct Answer: B
Explanation- 4°C
At 4°C (or 3.98°C to be exact) water is the densest. This is because the molecules are closest together at this temperature. Hence Option B is correct.
Q.8. Which of the following is the oldest culture of India?
(a) Palaeolithic culture
(b) Mesolithic culture
(c) Neolithic culture
(d) Vedic culture
Correct Answer: A
Explanation- The Paleolithic Period is an ancient cultural stage of human technological development, characterized by the creation and use of rudimentary chipped stone tools. Such tools were also made of bone and wood. The Paleolithic or Palaeolithic or Palæolithic, also called the Old Stone Age, is a period in human prehistory distinguished by the original development of stone tools that covers c. 99% of the period of human technological prehistory. Hence Option A is correct.
Q.9. The birthplace of Mahavira was at________?
(a) Kaushambi
(b) Kundagrama
(c) Sarnath
(d) Prayaga
Correct Answer: B
Explanation- Mahavira (Sanskrit: महावीर:), also known as Vardhamana was the 24th Tirthankara of Jainism. He was the spiritual successor of the 23rd TirthankaraParshvanatha.Mahavira was born in the early part of the 6th century BCE into a royal Jain family in Bihar, India. Hence Option B is correct.
Q.10. In an MRI machine, what type of waves is used?
(a) Sound wave
(b) X-ray
(c) Ultrasound wave
(d) Magnetic wave
Correct Answer: D
Explanation- MRI uses magnetic fields and radio waves to measures how much water is in different tissues of the body, maps the location of the water and then uses this information to generate a detailed image. Hence Option D is correct.