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501.

Average body surface area of a man will be:

A.	122 m2	B.	1.5 m2
C.	2.0 m2	D.	25 m2

502.

The frequency range of human ear extends from as low as:

A.	10 Hz	B.	16 Hz
C.	20 Hz	D.	None of these

503.

The frequency range of human ear extends from as high as:

A.	10000 Hz	B.	15000 Hz
C.	20000 Hz	D.	None of these

504.

Unit of noise is:

A.	Kg per sq.cm	B.	Decible
C.	Both (a) & (b)	D.	None of these

505.

For air bone sounds the reference sound pressure is:

A.	0.001 N/m2	B.	0.00002 N/m2
C.	0.0003 N/m2	D.	0.00004 N/m2

506.

Maximum noise level from a tractor mear the operator's ear should not exceed:

A.	85 dB	B.	90dB
C.	95 dB	D.	100 dB

507.

The upper safe noise level is:

A.	80 dB	B.	85 dB
C.	90 dB	D.	92 dB

508.

A noise level for eight hours of working is:

A.	85 dB	B.	90 dB
C.	95 dB	D.	100 dB

509.

A noise level for six hours of working is:

A.	80 dB	B.	85 dB
C.	90 dB	D.	92 dB

510.

A noise level for four hours of working is:

A.	90 dB	B.	95 dB
C.	100 dB	D.	105 dB