Скачать или смотреть NTA App NEET Physics Test-7 | Full Solutions | National Test Abhyas | Prateek Jain Sir ( Kota )

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Q. 1 An Ideal gas is at temperature 300 K. The final temperature of the gas when its volume changes from V to 2V in the process P = αV (here α is a positive constant) is
A. 900 K
B. 1200 K
C. 600 K
D. 300 K
Ans. B
Q.2 A short bar magnet of magnetic moment 0.4 JT–1 is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is
A. –0.064 J
B. zero
C. –0.082 J
D. 0.064 J
Ans. A
Q.3 What is the dimension of the coefficient of viscosity η?
A. ML–1T–2
B. MLT–1
C. ML–1T–1
D. ML–2T–2
Ans. C
Q. 4 A square frame of side 10 cm and a long straight wire carrying current 1 A are in the plane of the paper. Starting from close to the wire, the frame moves towards the right with a constant speed of 10 ms–1 (see figure). The e.mr induced at the time the left arm of the frame is at x = 10 cm from the wire is

0.75 μV
1 μV
2 μV
0.5 μV
Ans. B
Q.5 A ball is projected at an angle 60° with the horizontal with speed 30 m/s. What will be the speed of the ball when it makes an angle 45° with the horizontal?
A. 30 m/s
B. 15√2 m/s
C. 15/√2 m/s
D. 30√2 m/s
Ans. B
Q.6 In the circuit given below, a 100 W bulb B1 and two 60 W bulbs B2 and B3, are connected to a 250 V direct current source. If W1, W2, and W3 are the powers of the three bulbs then, which of the following statements is correct?

W1 W2 = W3
W1 W2 W3
W1 W2 = W3
W1 W2 W3
Ans. D
Q.7 The figure shows the variation of force acting on a particle of mass 400 g executing simple harmonic motion. The frequency of oscillation of the particle is

4 s–1
(5/2π) s–1
(1/8π) s–1
(1/2π) s–1
Ans. B
Q.8 2 L of water in a container is heated with a coil of 1 kW at 27 oC. The lid of the container is open and energy dissipates at rate of 160 Js Find the time after which temperature will rise from 27 oC to 77 oC [Given specific heat of water is 4.2 kJ / Kg]
A. 8 min 20 sec
B. 6 min 2 sec
C. 7 min
D. 14 min
Ans. A
9. Angular speed of hour hand of a clock in degree per second is
A. 1/30
B. 1/60
C. 1/120
D. 1/720
Ans. C
10. Which of the following is more closed to a black body?
A. Black board paint
B. Green leaves
C. Black hole
D. Red roses
Ans. A.
11. The fundamental frequency of a string stretched with a weight of 4 kg is 256 Hz. The weight required to produce its octave is
A. 16 kg-wt
B. 12 kg-wt
C. 24 kg-wt
D. 8 kg-wt
Ans. A.
12. volume (V) of the nucleus is related to mass number (A) is
A. V ∝ A2
B. V ∝ A1/3
C. V ∝ A2/3
D. V ∝ A
Ans. D
13. Wire of length 10 m is subjected to a force of 100 N along its length and hence the lateral strain produced is 0.01 × 10–3 m. The Poisson’s ration was found to be 0.4. If the area of cross-section of wire is 0.025 m2, its Young’s modulus will be
A. 1.6 × 108 Nm–2
B. 2.5 × 1010 Nm–2
C. 1.25 × 1011 Nm–2
D. 16 × 109 Nm–2
Ans. A.
14. An object is dragged along a horizontal surface by the machine which delivers a constant power. How does the distance moved by the object is dependent on time t?
A. t3/4
B. t3/2
C. t1/4
D. t1/2
Ans. B.
15. The resistance of the following circuit figure between a and B is

(3/2) Ω
2Ω
4 Ω
8 Ω
Ans. A.
16.