Physics Test 60

Result

Physics Test 60

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Weekly Quiz Competition

Question 1
4 / -1

A radioactive nucleus (initial mass number A and atomic number Z) emits 3 α− particles and 2 positrons. The ratio of number of neutrons to that of protons in the final nucleus will be

A
A−Z−8 / Z−4

B
A−Z−4 / Z−8

C
A−Z−12 / Z− 4

D
A−Z−4 / Z−2
Question 2
4 / -1

A diatomic ideal gas is used in a Car engine as the working substance. If during the adiabatic expansion part of the cycle, volume of the gas increases from V to 32V the efficiency of the engine is

A
0.5

B
0.75

C
0.99

D
0.25
Question 3
4 / -1

If a source of power 4 kW produces 10²⁰ photons/second, the radiation belong to a part of the spectrum called

A
X-rays

B
ultraviolet rays

C
microwaves

D
γ−rays
Question 4
4 / -1

The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1 × 10⁻³ are

A
5,1,2

B
5,1,5

C
5,5,2

D
4,4,2
Question 5
4 / -1

In a series LCR circuit R=200Ω and the voltage and the frequency of the main supply is 220 V and 50 Hz respectively. On taking out the capacitance from the circuit the current lags behind the voltage by 30^∘. On taking out the inductor from the circuit the current leads the voltage by 30^∘. The power dissipated in the LCR circuit is

A
305 W

B
210 W

C
Zero W

D
242 W
Question 6
4 / -1

In a transistor circuit, the collector current is 50 mA and the base current is 1 mA. The current gain α is

A
51 / 50

B
49 / 50

C
50 / 51

D
49 / 51