Physics Test 42

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Physics Test 42

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Weekly Quiz Competition

Question 1
4 / -1

The value of Stefan's constant in S.I. system is 5.67 × 10^–8 Js^–1m^–2k^–4. A new system of unit is define known as ALLEN system where one unit of mass in new system is 8 kg, and one unit of time is new system is 2 sec. If all other quantity remain same as S.I. system then find new value of stefan's constant in ALLEN system :-

A
5.67 × 10^–8

B
5.67 × 2 × 10^–8

C
5.67 × 2 × 10^–2

D
5.67 × 4 × 10^–8
Question 2
4 / -1

A travelling microscope has a main scale graduated in 1/2 mm. 50 vernier divisions coincide with 49 main scale divisions. What will be the reading if the main scale reads 7.45 cm and the 29th division of the vernier coincides with the main scale division ?

A
7.459 cm

B
7.453 cm

C
7.479 cm

D
7.48 cm
Question 3
4 / -1

Three waves A, B and C of frequencies 1600 kHz, 5 MHz and 60 MHz, respectively are to be transmitted from one place to another. Which of the following is the most appropriate mode of communication?

A
A is transmitted via space wave while B and C are transmitted via sky wave.

B
A is transmitted via ground wave, B via sky wave and C via space wave.

C
B and C are transmitted via ground wave while A is transmitted via sky wave.

D
B is transmitted via ground wave while A and C are transmitted via space wave.