1. Xtra Edge February 2012 - Career Point
1. Xtra Edge February 2012 - Career Point
1. Xtra Edge February 2012 - Career Point
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PHYSICS<br />
Questions 1 to 9 are multiple choice questions. Each<br />
question has four choices (A), (B), (C) and (D), out of<br />
which ONLY ONE is correct. Mark your response in<br />
OMR sheet against the question number of that<br />
question. + 3 marks will be given for each correct<br />
answer and – 1 mark for each wrong answer.<br />
<strong>1.</strong> Ice point on a particular scale measure 22º. The scale<br />
agrees with Fahrenheit scale at 72ºF. The<br />
temperature in Fahrenheit scale when new scale<br />
reads 27º is -<br />
(A) 40ºF (B) 38ºF (C) 36ºF (D) 34ºF<br />
2. A hot body is kept in a chamber maintained at fixed<br />
lower temperature. Time taken by body in loosing<br />
half the maximum heat it can lose is<br />
3.<br />
5 min. Time taken by body in loosing the maximum<br />
heat it can lose is -<br />
(A) 10 min (B) 12 min (C) 20 min (D) Infinite<br />
A point source of power 4 W is placed at the centre<br />
of spherical shell. The shell is kept in a vacuum<br />
chamber maintained at 27ºC. If shell attains a<br />
constant temperature 37ºC, emissivity of surface of<br />
shell is nearly -<br />
1<br />
(A)<br />
2<br />
1<br />
(B)<br />
3<br />
2<br />
(C)<br />
3<br />
4<br />
(D)<br />
5<br />
4. In a resonance–column experiment, a long tube, open<br />
at top, is clamped vertically. Water level inside tube<br />
can be moved up or down. First resonance is<br />
occuring when water level is at depth 20 cm below<br />
open end. Let second resonance occurs when water<br />
level is at a distance ‘x’ below opening, then -<br />
Based on New Pattern<br />
IIT-JEE 2013<br />
<strong>Xtra</strong><strong>Edge</strong> Test Series # 10<br />
Time : 3 Hours<br />
Syllabus :<br />
Physics : Full Syllabus, Chemistry : Full Syllabus, Mathematics : Full syllabus<br />
Instructions :<br />
• Question 1 to 9 are multiple choice questions with only one correct answer. +3 marks will be awarded for<br />
correct answer and -1 mark for wrong answer.<br />
• Question 10 to 13 are Reason and Assertion type question with one correct answer. +3 marks will be awarded for<br />
correct answer and –1 mark for wrong answer.<br />
• Question 14 to 19 are passage based questions. +4 marks will be awarded for correct answer and –1 mark for wrong<br />
answer.<br />
• Question 20 to 22 are Column Matching type questions. +6 marks will be awarded for the complete correctly<br />
matched answer (i.e. +1 marks for each correct row) and No Negative marks for wrong answer.<br />
(A) x = 40 cm (B) x = 60 cm<br />
(C) x < 60 cm (D) x > 60 cm<br />
5. Figure shows a toy-whistle. It a disk made of plastic<br />
having two conical grooves at diametrically opposite<br />
point. When it is rotated about its centre with<br />
sufficiently high speed air intercepted by groove<br />
produce whistling sound. An observer is at a distance<br />
10 m from the centre of toy. Radius of toy is 15 cm.<br />
Frequency of sound emitted by toy when it is rotating<br />
1800<br />
with ω = rpm is 10 kHz. If velocity of sound<br />
π<br />
in air 300 m/s, beat frequency heard by observer is –<br />
(A) 10 Hz (B) 15 Hz (C) 20 Hz (D) None<br />
6. An ice cube is fixed at the bottom of container<br />
containing water. Water in the container will be<br />
cooled majorly by -<br />
(A) Convection (B) Conduction<br />
(C) Radiation (D) Convection and conduction<br />
7. In a region of space a constant force F newton acts<br />
on a particle of mass m, which is released from rest<br />
at point A. When the particle reaches B its –<br />
m<br />
A B<br />
<strong>Xtra</strong><strong>Edge</strong> for IIT-JEE 60 FEBRUARY <strong>2012</strong><br />
→<br />
F<br />
O
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