# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 77 - 81 of 2320

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## Question number: 77

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MCQ▾

### Question

10 the unit of Stefan’s constant a is

### Choices

Choice (4)Response

a.

Wm -2 K -1

b.

Wm -2 K -4

c.

Wm 2 K -4

d.

Wm -2 K 4

## Question number: 78

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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.

(b1 + c 1 + d1 + e1) %

d.

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

## Question number: 79

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MCQ▾

### Question

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

### Choices

Choice (4)Response

a.

4,43 cm

b.

4.431 cm

c.

4 cm

d.

4.4 cm

## Question number: 80

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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.

8.42 %

c.

4.56 %

d.

7.96 %

## Question number: 81

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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 b. and c. are correct

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