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2018 41 questions

Q512018 · 9 Sept 2018
Directions
Directions : The following six (6) items consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the correct answer using the code given below. Code : Statement I : The pitch of the sound wave depends upon its frequency.
Statement II : The loudness of the sound wave depends upon its amplitude.
1. A.Both the statements are individually true and Statement II is the correct explanation of Statement I
2. B.Both the statements are individually true but Statement II is not the correct explanation of Statement I
3. C.Statement I is true but Statement II is false
4. D.Statement I is false but Statement II is true
Show answer
Answer: B
Q522018 · 9 Sept 2018
Directions
Directions : The following six (6) items consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the correct answer using the code given below. Code : Statement I : The pitch of the sound wave depends upon its frequency.
Statement I : Sound wave cannot propagate in vacuum. Statement II : Sound waves are elastic waves and require a medium to propagate.
1. A.Both the statements are individually true and Statement II is the correct explanation of Statement I
2. B.Both the statements are individually true but Statement II is not the correct explanation of Statement I
3. C.Statement I is true but Statement II is false
4. D.Statement I is false but Statement II is true
Show answer
Answer: A
Q532018 · 9 Sept 2018
The frequency of ultrasound waves is
1. A.less than 20 Hz
2. B.between 20 Hz and 2 kHz
3. C.between 2 kHz and 20 kHz
4. D.greater than 20 kHz
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Answer: D
Q542018 · 9 Sept 2018
The magnetic field strength of a current-carrying wire at a particular distance from the axis of the wire
1. A.depends upon the current in the wire
2. B.depends upon the radius of the wire
3. C.depends upon the temperature of the surroundings
4. D.None of the above
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Answer: A
Q572018 · 9 Sept 2018
The full form of LED is
1. A.Light Emitting Diode
2. B.Light Emitting Device
3. C.Light Enhancing Device
4. D.Light Enhancing Diode
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Answer: A
Q592018 · 9 Sept 2018
Consider the following circuit : Which one of the following is the value of the resistance between points A and B in the circuit given above?
1. A. $\frac{2}{5} R$
2. B. $\frac{3}{5} R$
3. C. $\frac{3}{2} R$
4. D. $4 R$
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Answer: B
Q602018 · 9 Sept 2018
The absolute zero temperature is 0 Kelvin. In °C unit, which one of the following is the absolute zero temperature?
1. A. $0^{\circ} C$
2. B. $- 100^{\circ} C$
3. C. $- 273.15^{\circ} C$
4. D. $- 173.15^{\circ} C$
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Answer: C
Q612018 · 9 Sept 2018
Consider the following statements about visible light, UV light and X-rays : 1. The wavelength of visible light is more than that of X-rays. 2. The energy of X-ray photons is higher than that of UV light photons. 3. The energy of UV light photons is less than that of visible light photons. Which of the statements given above is/are correct?
1. A.1, 2 and 3
2. B.1 and 2 only
3. C.2 and 3 only
4. D.1 only
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Answer: B
Q622018 · 9 Sept 2018
The time period of oscillation of a simple pendulum having length $L$ and mass of the bob $m$ is given as $T$ . If the length of the pendulum is increased to $4 L$ and the mass of the bob is increased to $2 m$ , then which one of the following is the new time period of oscillation?
1. A. $T$
2. B. $2 T$
3. C. $4 T$
4. D. $T /2$
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Answer: B
Q632018 · 9 Sept 2018
The connecting cable of electrical appliances like electric iron, water heater or room heater contains three insulated copper wires of three different colours—red, green and black. Which one of the following is the correct colour code?
1. A.Red—live wire, Green—neutral wire, Black—ground wire
2. B.Red—neutral wire, Green—ground wire, Black—live wire
3. C.Red—live wire, Green—ground wire, Black—neutral wire
4. D.Red—ground wire, Green—live wire, Black—neutral wire
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Answer: C
Q642018 · 9 Sept 2018
1. A. $R_{1} > R_{2} > R_{3}$
2. B. $R_{1} < R_{3} < R_{2}$
3. C. $R_{3} < R_{1} < R_{2}$
4. D. $R_{3} > R_{2} > R_{1}$
Show answer
Answer: B
Q652018 · 9 Sept 2018
Consider the following statements about a microscope and a telescope : 1. Both the eyepiece and the objective of a microscope are convex lenses. 2. The focal length of the objective of a telescope is larger than the focal length of its eyepiece. 3. The magnification of a telescope increases with the increase in focal length of its objective. 4. The magnification of a microscope increases with the increase in focal length of its objective. Which of the statements given above are correct?
1. A.1 and 3 only
2. B.1 and 4
3. C.2, 3 and 4
4. D.1, 2 and 3
Show answer
Answer: D
Q662018 · 9 Sept 2018
A planet has a mass $M_{1}$ and radius $R_{1}$ . The value of acceleration due to gravity on its surface is $g_{1}$ . There is another planet 2, whose mass and radius both are two times that of the first planet. Which one of the following is the acceleration due to gravity on the surface of planet 2?
1. A. $g_{1}$
2. B. $2 g_{1}$
3. C. $g_{1} /2$
4. D. $g_{1} /4$
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Answer: C
Q672018 · 9 Sept 2018
The wavelength of X-rays is of the order of
1. A.1 Å
2. B.1 μm
3. C.1 mm
4. D.1 cm
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Answer: A
Q682018 · 9 Sept 2018
Consider the following velocity and time graph: Which one of the following is the value of average acceleration from 8 s to 12 s?
1. A. $8 m/ s^{2}$
2. B. $12 m/ s^{2}$
3. C. $2 m/ s^{2}$
4. D. $- 1 m/ s^{2}$
Show answer
Answer: D
Q692018 · 9 Sept 2018
If the focal length of a convex lens is 50 cm, which one of the following is its power?
1. A.+2 dioptre
2. B.+0.02 dioptre
3. C.−0.5 dioptre
4. D.+0.5 dioptre
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Answer: A
Q722018 · 9 Sept 2018
The refractive indices of two media are denoted by $n_{1}$ and $n_{2}$ , and the velocities of light in these two media are respectively $v_{1}$ and $v_{2}$ . If $n_{2} / n_{1}$ is 1.5, which one of the following statements is correct?
1. A. $v_{1}$ is 1.5 times $v_{2}$ .
2. B. $v_{2}$ is 1.5 times $v_{1}$ .
3. C. $v_{1}$ is equal to $v_{2}$ .
4. D. $v_{1}$ is 3 times $v_{2}$ .
Show answer
Answer: A
Q732018 · 9 Sept 2018
Which one of the following statements is correct for a plane mirror?
1. A.Its focal length is zero.
2. B.The size of the image of an object placed in front of the mirror is slightly less than that of the object.
3. C.The image is virtual, erect and laterally inverted.
4. D.Its focal length is 200 cm.
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Answer: C
Q742018 · 9 Sept 2018
An object is placed in front of a convex mirror. Which one of the following statements is correct?
1. A.It will never form an inverted image.
2. B.The image moves towards the focus when the object moves towards the mirror.
3. C.Depending on the position of the object with respect to the mirror, the image can be inverted and real.
4. D.The size of the image becomes larger than that of the object when the object is placed at a distance equal to half the focal length.
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Answer: A
Q752018 · 9 Sept 2018
A circular coil of radius $R$ having $N$ number of turns carries a steady current $I$ . The magnetic induction at the centre of the coil is 0.1 tesla. If the number of turns is doubled and the radius is halved, which one of the following will be the correct value for the magnetic induction at the centre of the coil?
1. A.0.05 tesla
2. B.0.2 tesla
3. C.0.4 tesla
4. D.0.8 tesla
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Answer: C
Q512018 · 22 Apr 2018
Which one of the following statements is correct?
1. A.Any energy transfer that does not involve temperature difference in some way is not heat
2. B.Any energy transfer always requires a temperature difference
3. C.On heating the length and volume of the object remain exactly the same
4. D.Whenever there is a temperature difference, heat is the only way of energy transfer
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Answer: A
Q522018 · 22 Apr 2018
If T is the time period of an oscillating pendulum, which one of the following statements is NOT correct?
1. A.The motion repeats after time T only once
2. B.T is the least time after which motion repeats itself
3. C.The motion repeats itself after nT, where n is a positive integer
4. D.T remains the same only for small angular displacements
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Answer: A
Q532018 · 22 Apr 2018
If an object moves with constant velocity then which one of the following statements is NOT correct?
1. A.Its motion is along a straight line
2. B.Its speed changes with time
3. C.Its acceleration is zero
4. D.Its displacement increases linearly with time
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Answer: B
Q542018 · 22 Apr 2018
An object is moving with uniform acceleration a. Its initial velocity is u and after time t its velocity is v. The equation of its motion is v = u + at. The velocity (along y-axis) time (along x-axis) graph shall be a straight line
1. A.passing through origin
2. B.with x-intercept u
3. C.with y-intercept u
4. D.with slope u
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Answer: C
Q552018 · 22 Apr 2018
What is the net force experienced by a bar magnet placed in a uniform magnetic field?
1. A.Zero
2. B.Depends upon length of the magnet
3. C.Never zero
4. D.Depends upon temperature
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Answer: A