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NEET Physics Solved Question Paper 2003

Multiple Choice Questions

31.
22 g of CO₂ at 27⁰ C is mixed with 16 g of O₂ at 37⁰C. If both gases are considered as ideal, then temperature of mixture is

30.5⁰C

37⁰C

27⁰C

29.3⁰C

29.3⁰C

$22 g of {CO}_{2} at T_{1} = 27^{o} C = 27 + 273 = 300 k is mixed with 16 g of O_{2} at T_{2} = 37^{0} C = 37 + 273 = 310 k molar mass of carbon = 12 g / mol and molar mass of oxygen = 16 g / mol by addition of both \Rightarrow 12 + 16 \times 2 = 44 g / mol simillarly, O_{2} \Rightarrow 16 \times 2 = 32 g / mol T = \frac{n_{1} C_{v_{1}} T_{1} + n_{2} C_{v_{2}} T_{2}}{n_{2} C_{v_{1}} + n_{2} C_{v_{2}}} = \frac{\frac{22}{44} \times 3 R \times 300 + \frac{16}{32} \times \frac{5}{2} R \times 310}{\frac{22}{44} \times 3 R + \frac{16}{32} \times \frac{5}{2} R} = 302.3 k = 29 . 3^{0} C$

32.

At a given temperature the pressure of an ideal of density p is proportional to

$ρ^{2}$
$ρ$
$\frac{1}{ρ^{2}}$
$\frac{1}{ρ}$

33.

Air is expanded from 50 litres to 150 litres at atmosphere the external work done is (1 atmospheric pressure =1 $\times$ $10^{5} N / m^{2}$ )

$2 \times 10^{- 8} J$
$2 \times 10^{4} J$
200J
2000J

34.

Helium at 27⁰C has a volume 8 litres. it is suddenly compressed to a volume of 1 litre. The temperature of the gas will be $(V = \frac{5}{3})$

9327⁰C
1200⁰C
927⁰C
108⁰C

35.

Energy is being emitted from the surface of a black body at 127°C the rate of 1.0 x 10⁶ J/sm². The temperature of the black body at which the rate of energy emission is 16.0 x 10° J/sm² will be

754⁰C
527⁰C
254⁰C
508⁰C

36.

A cup of tea cools from 80°C to 60°C in one minute. The ambient temperature is 30°C. In cooling from 60°C to 50°C. It will take

50 sec
90 sec
60 sec
48 sec

37.

Two metal plates having a potential difference of 800 V and 2 cm apart. It is found that a particle of mass 1.96 x 10^-15 kg remaining suspended in the region between the plates. The charge on the particle must be (e = elementry charge)

38.

The working of dynamic is based on the principle of

Electromagnetic induction
chemical effect of current
magnetic effect of current
heating effect of current

39.

When a voltmeter connected across the terminals of cell, measures 5 V and an ammeter connected measures 10 A. A resistance of 2 Ω is connected across the terminal of the cell. The current flowing through this resistance is

7.5amp
5.0amp
2.5amp
2.0amp

40.

In a neon discharge tube 2.9 x 10 Ne¹⁸ ions move to be the right per second while 1.2 x 10⁸ electron move to the left per second electric charge is 1.6 x 10^-19C. The current in discharge tube is