# NEET Physics: Questions 76 - 81 of 2142

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## Question number: 76

MCQ▾

### Question

10 the unit of Stefan’s constant a is

### Choices

Choice (4) Response

a.

Wm 2 K -4

b.

Wm -2 K 4

c.

Wm -2 K -4

d.

Wm -2 K -1

## Question number: 77

MCQ▾

### Question

A physical parameter a can be determined by measuring the parameters b, c, d and e using the relation a =

If the maximum errors in the measurement of b, c, d and e are b1 %, c1 %, d1 %, and e1 %, then the maximum error in the value of a determined by the experiment is

### Choices

Choice (4) Response

a.

(b 1 + c 1 - d 1 - e 1) %

b.

(b 1 + c 1 + d 1 + e 1) %

c.

(b 1 + c 1 - d 1 - e 1) %

d.

(b1 + c 1 + d1 + e1) %

## Question number: 78

MCQ▾

### Question

If L = 2.331 cm, B = 2.1 cm, then L + B =

### Choices

Choice (4) Response

a.

4, 43 cm

b.

4 cm

c.

4.431 cm

d.

4.4 cm

## Question number: 79

MCQ▾

### Question

In an experiment, the following observations were recorded: L = 2.820 m, M = 3.00 kg, l = 0.087 cm, Diameter D = 0.041 cm. Taking g = 9.81 m/s2 using the formula, Y =

, the maximum percentage error in Y is

### Choices

Choice (4) Response

a.

6.50 %

b.

4.56 %

c.

7.96 %

d.

8.42 %

## Question number: 80

MCQ▾

### Question

Two trains, each 50 m long are travelling in opposite direction with velocity 10 m/s and 15 m/s. The time of crossing is

### Choices

Choice (4) Response

a.

2V√3s

b.

4s

c.

4√3s

d.

Both c. and b. are correct

## Passage

The internal radius of a 1 m long resonance tube is measured as 3 cm. A tuning fork of frequency 3500Hz is used. The first resonating length is measured as 14.6 cm and the second resonating length is measured as 24.0 cm.

## Question number: 81 (1 of 2 Based on Passage) Show Passage

MCQ▾

### Question

Calculate the speed of sound at the room temperature

### Choices

Choice (4) Response

a.

276 m/s

b.

675 m/s

c.

930 m/s

d.

658 m/s

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