Answer: A) TRUE Explanation: Microwaves are high-frequency signals in the 300 MHz to 300 GHz range. This is in contrast to radio signals, which are typically broadcast in all directions. Radio signals operate in the 3 Hz to 300 MHz range. Microwave signals are used for both satellite and ground-based communications.

Answer: C) Peso Explanation:

Answer: B) 40 Explanation: The third proportional of two numbers p and q is defined to be that number r such that p : q = q : r.   Here, required third proportional of 10 & 20, and let it be 'a' => 10 : 20 = 20 : a 10a = 20 x 20 => a = 40   Hence, third proportional of 10 & 20 is 40.

A. Agraphia is an acquired neurological disorder that causes a lack of ability to communicate through writing, either due to motor dysfunction or the inability to spell.

B. Central agraphia usually involves language areas of the brain, causing difficulty spelling or spontaneous communication, and often co-occurs with other language disorders. Some types of central agraphia include:

1. Alphabetical agraphia – In this, there is difficulty in recognizing or writing letters.

2. Semantic agraphia – It involves difficulty in understanding or writing words.

3. Orthographic agraphia – It involves difficulty in applying spelling rules.