Q. Which of the following statements is/are correct about 'quasicrystal'?
1. In a 'quasicrystal' atoms are arranged in a repeating pattern.
2. 'Quasicrystals' are used in manufacturing non-stick frying pans, needles for acupuncture and surgery, dental instruments, and razor blades.
1) Only 1 is correct
2) Only 2 is correct
3) Both 1 and 2 are correct
4) Neither 1 nor 2 is correct
Q. When will a magnet lose its magnetism?
1) If it is cooled very much, say below absolute zero
2) If it is placed without the keepers
3) If it is heated strongly or hammered strongly
4) Once a magnet always a magnet
Q. Energy conversions taking place in a microphone are -
1) Sound to mechanical to electrical
2) Electrical to mechanical to sound
3) Sound to mechanical
4) Mechanical to sound
Q. E. M. F. of a cell is a -
1) Vector quantity
2) Scalar quantity
3) Unit of measurement
4) None of the above
Q. Short circuit means -
1) Direct flow of current between two points of different potential
2) The indirect flow of current between two points
3) Direct flow of current between points of the same potential
4) None of the above
Q. An Electron volt is a unit of -
4) Potential difference
Q. A wooden box of mass 2 kg and dimensions (30 cm x 15 cm x 10 cm) is placed on a table with sides 30 cm and 10 cm touching the tabletop. Which one of the following is the approximate pressure exerted on the table?
1) 111.1 N/m2
2) 222.2 N/m2
3) 333.3 N/m2
4) 666.6 N/m2
Q. What is the magnification produced by a concave lens of focal length 10 cm, when an image is formed at a distance of 5 cm from the lens?
Q. Two resistors R1and R2 arranged in parallel combination in an electrically closed circuit are made of the same material and of the same thickness. If the length of R2 is twice the length of R1,then the total resistance R satisfies -
1) 3R = 2R1
2) 3R = 2R2
3) 2R = 3R1
4) 2R = 3R2
Q. According to Fleming's right-hand rule, if the forefinger indicates the direction of the magnetic field and the thumb shows the direction of motion of the conductor, then the stretched middle finger will predict the direction of -
1) force acting on the conductor
2) electric field
3) induced current
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