3786: Consider the following :
1. Bluetooth device
2. Cordless phone
3. Microwave oven
4. Wi-Fi device
Which of the above can operate between 2-4 and 2-5 GHz range of radio frequency band ?
(a) 1 and 2 only
(b) 1, 2 and 4 only
(d) 3 and 4 only
(d) 1, 2, 3 and 4
3787: Consider the following pairs :
Protected area---Well known for
1. Bhiterkanika, Orissa---Salt Water Crocodile
2. Desert NationalPark, Rajasthan---Great Indian Bustard
3. Eravikulam, Kerala---Hoolak Gibbon
Which of the pairs given above is/are correctly matched ?
(a) 1 only
(b) 2 only
(c) 1 and 2 only
(d) 1, 2 and 3
3788: Consider the following:
1. Oxides of Hydrogen
2. Oxides of Nitrogen
3. Oxides of Sulphur
Which of the above causes/cause acid rain ?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2 and 3
3789: Which one of the following statements is not correct?
(a) Gulfs with narrow fronts and wider rears experience high tides.
(b) Tidal currents take place when a gulf is connected with the open sea by a narrow channel.
(c) Tidal bore occurs when a tide enters the narrow and shallow estuary of a river.
(d) The tidal nature of the mouth of the river Hooghly is of crucial importance to Kolkata as port.
3790: The Ajanta Caves were built during the period of:
(a) Guptas
(b) Kushans
(c) Mauryas
(d) Chalukyas