6th Class Computers Science Logo Basics Programming with Logo

    LOGO Command List  

     The following table lists the shortcut that is used to perform various   (See Figure. 6.2.1)  

SHORTCUT	INSTRUCTIONS	DESCRIPTION
CS	CLEARSCREEN	Allows clearing the picture before a new picture is drawn
ST	SHOWTURTLE	Allows showing the Turtle on the screen.
HT	HIDETURTLE	Hides the Turtle on the screen
PD	FORWARD Number	Allows moving the Turtle forwards according to the number indicated.
BK	BACK number	Allows moving the Turtle back according to the number indicated
RT	RIGHT angle	Allows changing the direction of the Turtle by turning to the right
LT	LEFT angle	Allows changing the direction of the Turtle by turning to the left
CT	Clear Text	Cle Text
Repeat	Repeat	Repeat the inserted commonds
Pu	Penup	Penup is used to lift the turtle's pen so it does not draw when morning.
Pd	Pendown	Penup is used to lift the turtle's pen so it does not draw when morning.
Pe	Penerase	Pendown is used to put the erase pen back down so it will draw when morning. Example setpen size[n n]
Perspective	Switch	Pen erase is used to change the pen to eraser Switch the turtle to 3D mode
Setpc [RGB]	Set the pen	Set the pen colour to the appropriate RGB values where rig and base numbers that rase from 0 to 255 force ramp be: Set pc [25500] gives red.
Set Pen size	Set pen size(n n)	This commond is used to set the width of the pen to n pixels. Where as n is the numbers. For example: Set pen size [55]
Pen normal	Sets the pen	Sets the pen base to the normal mode and colours erase mode.
Set flood - Colour  [RGB]	Sets the flood colour	Sets the flood colour to the appropriate RGB (Red, Green, Black) values where r, g and b are numbers that rases from 0 to 255. For example: Set flood colour [2550255]
Files	Flood the area	Flood the area bonded by lives with what even colour was specifically in the set flood colour command.
A Car	Draw on arc	Draw an arc with an included degrees and radius of r and turtle remains at the centre. For example: ARC 45 100.
	Draw on arc	Draw an arc with an included angle of a degrees and radius of r and turtle remains at the end of the arc.

  Using LOGO you can draw circle, rectangle, and line on the screen. The _______ shaped cursor on the blank screen is called TURTLE.

(A) Triangular                                                    

(B) Rectangle

(C) Square                                          

(D) Circle

(E) None of these  

Answer: (a)

Explanation 

Correct Option:

(A) The shape of TURTLE is always triangular.

Incorrect Options:

Rest of the options is incorrect.    

 Jack wants to erase a picture before a new picture is drawn. Which one of the following commands he used to perform that task?

(A) LT                                                                   

(B) CL

(C) CS                                                                   

(D) RT

(E) None of these  

Answer: (c)

Explanation

Correct Option:

(C) CS allows clearing the picture before a new picture is drawn.

Incorrect Options:

(A) LT allows changing the direction of the Turtle.

(B) CL command is not available in LOGO.

(D) RT allows moving the turtle to right angle.    

 The triangular shaped cursor on the screen is called turtle. Which one of the following commands is used to hide the turtle on the screen?

(A) LT                                                                   

(B) HT

(C) CS                                                                   

(D) RT

(E) None of these  

Answer: (b)

Explanation

Correct Option:

(B) HT allows hiding turtle on the screen.

Incorrect Options:

(A) LT allows changing the direction of the Turtle.

(C) CS allows clearing the picture before a new picture is drawn.

(D) RT allows moving the turtle to right angle.