ENGINEERING CAREER AND STUDY MATERIALS

1. What is the mejority charge carrer of p-type semiconductor ? i)Holes ii)Electrons iii)Protons v)Nuetrons 2. which of the following electrical conductor used in a Battery ? 1 Gas 2 water 3 silver 4 Aluminium. 3. what is the lightning arrester maximum voltage is→_____ a . below 10KV b. 10KV c. 100 kv d. above 100MV 4. The magniture of XL increases by increasing 1. Voltage 2. Current

Consider the following passage and answer the questions that follow accordingly. Humans may have reached northern Europe (including England) 200 000 years earlier than previously thought. Stone tools found in England suggest that early humans were there 700 000 years ago. The stone tools were discovered at a site in Suffolk. The tools have been dated using several methods. Firstly, the magnetic polarity of iron-containing minerals in the sedimentary rocks where the tools were found is aligned north-south, just as it is today. Since the Earth’s magnetic field underwent a polarity reversal 780 000 years ago, the site must be younger than that. The tools were found beneath glacial ice deposits laid down during a period 450 000 years ago when the region was blanketed in ice, so they must be older than this. Also present at the site were fossils of a water vole Mimomys, which was superseded by another vole species called Arvicola around 500 000 years ago. A new amino-acid dating techniqu

1.  The woman in the cartoon has found the man’s ‘private heartache’ a. confusing. b. intriguing. c. distressing. d. uninteresting. Answer:  d. uninteresting. 2. The woman suggests that, for a first date, the man has a. lacked generosity. b. revealed too much about himself. c. been too reserved. d. chosen an inappropriate venue. Answer:  b. revealed too much about himself.

1. Which of the following metals cannot be produced by aqueous electrolysis? (A) Zinc (B) Copper (C) Gold (D)  Aluminium Answer: (D)  Aluminium 2. The carbon content of low carbon, medium carbon and high carbon steel are respectively. (A) (0-0.1)%; (0.1 – 0.4)% and (0.4 – 1.8)% (B) (0.25-0.4) %; (0.4 – 0.7)% and (0.7 – 1.7)% (C)  Upto 0.25%; (0.25-0.65)% and (0.65 – 1.7)% (D) None of these Answer: (C)  Upto 0.25%; (0.25-0.65)% and (0.65 – 1.7)% 3. Fracture stress for a brittle material having a crack length of 1 µm is 200 MPa. Fracture stress for the same material having a crack length of 4 µm is (A) 200 MPa  (B) 150 MPa (C) 100 MPa (D) 50 MPa